WO2019188538A1 - エネルギー貯蔵デバイスのアンダーコート層形成用組成物 - Google Patents
エネルギー貯蔵デバイスのアンダーコート層形成用組成物 Download PDFInfo
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- WO2019188538A1 WO2019188538A1 PCT/JP2019/011327 JP2019011327W WO2019188538A1 WO 2019188538 A1 WO2019188538 A1 WO 2019188538A1 JP 2019011327 W JP2019011327 W JP 2019011327W WO 2019188538 A1 WO2019188538 A1 WO 2019188538A1
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- Prior art keywords
- energy storage
- storage device
- undercoat layer
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- 229910001925 ruthenium oxide Inorganic materials 0.000 description 1
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- 125000005372 silanol group Chemical group 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 1
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- 239000011593 sulfur Substances 0.000 description 1
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- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
- C01B32/174—Derivatisation; Solubilisation; Dispersion in solvents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/68—Current collectors characterised by their material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/70—Current collectors characterised by their structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
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- H01M4/667—Composites in the form of layers, e.g. coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/38—Carbon pastes or blends; Binders or additives therein
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a composition for forming an undercoat layer of an energy storage device.
- a lithium ion secondary battery is a secondary battery that has been developed most vigorously at present because it has a high energy density and a high voltage and has no memory effect during charging and discharging.
- the development of electric vehicles has been actively promoted due to recent efforts to deal with environmental problems, and higher performance has been demanded for secondary batteries as a power source.
- a lithium ion secondary battery contains a positive electrode and a negative electrode capable of occluding and releasing lithium, and a separator interposed therebetween in a container, and an electrolyte solution (liquid in the case of a lithium ion polymer secondary battery) therein. It has a structure filled with a gel-like or all solid electrolyte instead of the electrolyte.
- an active material capable of occluding and releasing lithium, a conductive material mainly composed of a carbon material, and a composition containing a polymer binder are generally applied on a current collector such as a copper foil or an aluminum foil. It is manufactured by doing.
- This binder is used to bond an active material and a conductive material, and further to the metal foil, and is a fluorine-based resin soluble in N-methylpyrrolidone (NMP) such as polyvinylidene fluoride (PVdF) or an olefin-based heavy polymer.
- NMP N-methylpyrrolidone
- PVdF polyvinylidene fluoride
- olefin-based heavy polymer Combined aqueous dispersions are commercially available.
- the adhesive strength of the binder to the current collector is not sufficient, and a part of the active material or conductive material is peeled off from the current collector during the manufacturing process such as the electrode cutting process or the winding process. , Causing a short circuit and variation in battery capacity.
- the contact resistance between the electrode mixture and the current collector increases due to the volume change of the electrode mixture due to the swelling of the binder due to the electrolytic solution and the volume change due to the lithium occlusion and release of the active material after long-term use.
- battery capacity is deteriorated due to part of the active material or conductive material peeling off from the current collector or dropping off, and further, there is a problem in terms of safety.
- Patent Document 1 discloses a technique in which a conductive layer containing carbon as a conductive filler is used as an undercoat layer and disposed between a current collector and an electrode mixture layer, and the undercoat layer is provided.
- a conductive layer containing carbon as a conductive filler is used as an undercoat layer and disposed between a current collector and an electrode mixture layer, and the undercoat layer is provided.
- Patent Document 2 and Patent Document 3 disclose similar techniques.
- Patent Document 4 and Patent Document 5 disclose an undercoat layer using carbon nanotubes (hereinafter also abbreviated as CNT) as a conductive filler.
- CNT carbon nanotubes
- the undercoat is expected not only to lower the resistance of the battery but also to suppress the increase in resistance, but depending on the conductive carbon material used, the resistance of the battery is increased and the resistance increase is accelerated. There is a case to let you. In this regard, it is not clear what conductive carbon material is used to reduce the resistance of the battery and suppress the increase in resistance.
- This invention is made in view of such a situation, and provides the composition for undercoat layer formation of the energy storage device which can provide the undercoat layer which exhibits a low resistance effect and a resistance raise inhibitory effect. With the goal.
- the inventors of the present invention have achieved low resistance by using a conductive carbon material having a high bulk density when a load is applied in the composition for forming an undercoat layer.
- the present invention was completed by finding that a composition capable of providing an undercoat layer exhibiting the effect of reducing the resistance and increasing the resistance was obtained.
- the present invention 1. Including a conductive carbon material, a dispersant, and a solvent; A composition for forming an undercoat layer of an energy storage device, wherein the density measured when a pressure of 20 kN / cm 2 is applied to the powder of the conductive carbon material is 1.15 g / cm 3 or more. , 2. The composition for forming an undercoat layer of an energy storage device according to 1, wherein the density is 1.18 g / cm 3 or more, 3. 2. The composition for forming an undercoat layer of an energy storage device according to 2, wherein the density is 1.20 g / cm 3 or more, 4). The composition for forming an undercoat layer of an energy storage device of 3 wherein the density is 1.25 g / cm 3 or more; 5.
- composition for forming an undercoat layer of an energy storage device according to 4 wherein the density is 1.30 g / cm 3 or more, 6).
- 14 undercoat layers for energy storage devices having a basis weight of 1,000 mg / m 2 or less, 16. 15 undercoat layers for energy storage devices, wherein the basis weight is 500 mg / m 2 or less, 17. 16 undercoat layers for energy storage devices, wherein the basis weight is 300 mg / m 2 or less, 18.
- the undercoat layer for 17 energy storage devices whose said fabric weight is 200 mg / m ⁇ 2 > or less, 19.
- a composite current collector for an electrode of an energy storage device comprising the undercoat layer of any one of 14 to 18; 20.
- An electrode for an energy storage device comprising a composite current collector for an electrode of 19 energy storage devices, 21.
- An energy storage device comprising 20 electrodes for energy storage devices, 22. 21 energy storage devices that are lithium ion batteries, 23.
- a conductive carbon material dispersion wherein a density measured when a pressure of 20 kN / cm 2 is applied to the powder of the conductive carbon material is 1.15 g / cm 3 or more, 24.
- the conductive coating film obtained from the conductive carbon material dispersion liquid of 23 is provided.
- composition for forming an undercoat layer of the energy storage device of the present invention is suitable as a composition for forming an undercoat layer that joins the current collector constituting the electrode of the energy storage device and the active material layer, By forming an undercoat layer on the current collector using the composition, the resistance of the energy storage device can be reduced and an increase in resistance can be suppressed.
- the composition for forming an undercoat layer of an energy storage device includes a conductive carbon material, a dispersant, and a solvent, and is measured when a pressure of 20 kN / cm 2 is applied to the powder of the conductive carbon material.
- the density is 1.15 g / cm 3 or more.
- the density of the conductive carbon material in this invention means a bulk density. The density can be measured using a known powder resistance measurement system, for example, a powder resistance measurement system MCP-PD51 manufactured by Mitsubishi Chemical Analytech Co., Ltd.
- the density of the conductive carbon material is 1.15 g / cm 3 or more, preferably 1.18 g / cm 3 or more from the viewpoint of reducing the resistance of the device and suppressing the resistance increase. , more preferably 1.20 g / cm 3 or more, even more preferably 1.25 g / cm 3 or more, and most preferably 1.30 g / cm 3 or more.
- the upper limit is not particularly limited, but is preferably 2.0 g / cm 3 or less, more preferably 1.6 g / cm 3 or less.
- the conductivity of the conductive carbon material is preferably 50 S / cm or less, more preferably 45 S / cm or less, and even more preferably 35 S / cm, from the viewpoint of reducing the resistance of the device and exhibiting a resistance increase suppressing effect. cm or less. Although a minimum in particular is not restrict
- the conductivity in the present invention means the conductivity expected when the density is 1 g / cm 3 .
- This conductivity is obtained by measuring the density and conductivity of the powder at a plurality of applied pressures, plotting the conductivity on the vertical axis and the density on the horizontal axis, and obtaining an approximate straight line by the least square method, From the straight line, the value is expected when the density is 1 g / cm 3 .
- the density and conductivity of the conductive carbon material can be measured by a known powder resistance measurement system (for example, MCP-PD51 type and Loresta GP manufactured by Mitsubishi Chemical Analytech Co., Ltd.).
- the conductive carbon material is not particularly limited as long as the density satisfies the above range, but a fibrous conductive carbon material, a layered conductive carbon material, and a particulate conductive carbon material are preferable. These conductive carbon materials can be used alone or in combination of two or more.
- fibrous conductive carbon material examples include carbon nanotubes (CNT) and carbon nanofibers (CNF), and CNT is preferable from the viewpoint of conductivity, dispersibility, availability, and the like.
- CNTs are generally produced by arc discharge, chemical vapor deposition (CVD), laser ablation, etc., but the CNTs used in the present invention may be obtained by any method. .
- a single-walled CNT in which a single carbon film (graphene sheet) is wound in a cylindrical shape
- DWCNT double-walled CNT
- MWCNT multi-layer CNTs in which a plurality of graphene sheets are concentrically wound.
- SWCNT, DWCNT, and MWCNT can be used alone or in combination.
- a multilayer CNT having a diameter of 2 nm or more is particularly preferable, and from the viewpoint that a thin film can be formed, a multilayer CNT having a diameter of 500 nm or less is particularly preferable, a multilayer CNT having a diameter of 100 nm or less is more preferable, and a multilayer having a diameter of 50 nm or less is preferable. CNT is even more preferable, and multilayer CNT having a diameter of 30 nm or less is most preferable.
- the diameter of CNT can be measured by observing the thin film obtained by drying what disperse
- the CNT it is preferable to use a CNT that is easy to disperse in the dispersion liquid in order to exert an effect of lowering the battery resistance when the dispersion liquid is used as an undercoat layer.
- Such CNTs preferably have many crystal discontinuities that can be easily cut with small energy.
- the CNT used in the composition of the present invention preferably has a constricted portion.
- the CNT having a constricted portion is a CNT wall having a constricted portion having a tube outer diameter of 90% or less of the parallel portion and the tube outer diameter of the parallel portion. Since this constricted part is a part created by changing the growth direction of CNTs, it has a discontinuous crystal part and becomes an easily breakable part that can be easily cut with a small mechanical energy.
- FIG. 1 shows a schematic cross-sectional view of a CNT having a parallel portion 1 and a constricted portion 3.
- the parallel part 1 is a part where the wall can be recognized as two parallel straight lines or two parallel curves.
- the distance between the outer walls of the parallel line in the normal direction is the tube outer diameter 2 of the parallel part 1.
- the constricted portion 3 is a portion where both ends thereof are connected to the parallel portion 1 and the distance between the walls is closer than that of the parallel portion 1, more specifically, the tube outer diameter 2 of the parallel portion 1 is increased.
- it is a portion having a tube outer diameter 4 of 90% or less.
- the tube outer diameter 4 of the constricted portion 3 is the distance between the outer walls of the constricted portion 3 where the wall constituting the outer wall is closest. As shown in FIG. 1, many of the constricted portions 3 have portions where crystals are discontinuous.
- the shape of the CNT wall and the outer diameter of the tube can be observed with a transmission electron microscope or the like. Specifically, it is possible to prepare a 0.5% dispersion of CNT, dry the dispersion on a sample stage, and confirm the constricted portion by an image taken at 50,000 times with a transmission electron microscope. it can.
- the CNT For the CNT, a 0.1% dispersion of CNT was prepared, the dispersion was placed on a sample stage and dried, and an image taken at 20,000 times with a transmission electron microscope was divided into 100 nm square sections, and 100 nm When 300 sections with CNT occupying 10% to 80% in all four sections are selected, the total number of easily breakable portions depends on the ratio of the section with at least one constricted portion in one section to 300 sections. The ratio (the ratio of the presence of easily breakable parts) is determined. When the area occupied by CNTs in the compartment is less than 10%, measurement is difficult because the amount of CNTs is too small.
- the existence ratio of easily breakable portions is 60% or more.
- the proportion of easily breakable portions is less than 60%, CNT is difficult to disperse, and when excessive mechanical energy is applied to disperse, it leads to the destruction of the crystal structure of the graphite surface, which is a characteristic of CNT. Characteristics such as electrical conductivity are reduced.
- the presence ratio of easily breakable portions is preferably 70% or more.
- CNTs usable in the present invention include TC-2010, TC-2020, TC-, which are CNTs having a constricted structure disclosed in International Publication Nos. 2016/076393 and JP-A-2017-206413.
- TC series such as 3210L and TC-1210LN (manufactured by Toda Kogyo Co., Ltd.), spar-growth CNT (manufactured by National Research and Development Corporation, Shinshin Energy and Industrial Technology Development Organization), eDIPS-CNT (national research and development corporation, Shinshin Energy and Industry SWNT series (made by Meijo Nanocarbon Co., Ltd .: trade name), VGCF series (made by Showa Denko KK: trade name), FloTube series (made by CNano Technology Co., Ltd .: trade name), AMC ( Ube Industries, Ltd.
- the layered conductive carbon material include graphite and graphene.
- the graphite is not particularly limited, and various commercially available graphites can be used.
- Graphene is a sheet of sp2-bonded carbon atoms with a thickness of 1 atom, and has a hexagonal lattice structure like a honeycomb made of carbon atoms and their bonds, and its thickness is about 0.38 nm. It is said.
- graphene oxide obtained by processing graphite by the Hummers method may be used.
- the particulate conductive carbon material include carbon black such as furnace black, channel black, acetylene black, and thermal black.
- the carbon black is not particularly limited, and various commercially available carbon blacks can be used, and the particle diameter is preferably 5 to 500 nm.
- a conductive carbon material satisfying the above density for example, carbon black, ketjen black, acetylene black, carbon whisker, carbon fiber, natural graphite, artificial graphite, etc.
- the conductive carbon material it is preferable to use CNT satisfying the above density alone.
- the dispersant can be appropriately selected from those conventionally used as a dispersant for conductive carbon materials such as CNTs.
- CMC carboxymethylcellulose
- PVP polyvinylpyrrolidone
- acrylic resin emulsion water-soluble Acrylic polymer
- styrene emulsion silicone emulsion
- acrylic silicone emulsion fluororesin emulsion
- EVA emulsion vinyl acetate emulsion
- vinyl chloride emulsion urethane resin emulsion
- triarylamine hyperbranched polymer described in International Publication No. 2014/04280
- polymers having an oxazoline group in the side chain described in International Publication No. 2015/029949 polymers having an oxazoline group in the side chain described in International Publication No. 2015/029949.
- a dispersant containing a polymer having an oxazoline group in the side chain described in International Publication No. 2015/029949 or a dispersant containing a triarylamine-based highly branched polymer described in International Publication No. 2014/04280 is used. It is preferable.
- a polymer having an oxazoline group in the side chain (hereinafter referred to as oxazoline polymer) is obtained by radical polymerization of an oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position as shown in Formula (1).
- oxazoline polymer is obtained by radical polymerization of an oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position as shown in Formula (1).
- Preferred is a vinyl polymer having a repeating unit bonded to the polymer main chain or spacer group at the 2-position of the oxazoline ring and having an oxazoline group in the side chain.
- X represents a polymerizable carbon-carbon double bond-containing group
- R 1 to R 4 are independently of each other a hydrogen atom, a halogen atom, an alkyl group having 1 to 5 carbon atoms, or a 6 to 20 carbon atoms.
- An aryl group or an aralkyl group having 7 to 20 carbon atoms is represented.
- the polymerizable carbon-carbon double bond-containing group of the oxazoline monomer is not particularly limited as long as it contains a polymerizable carbon-carbon double bond, but a chain containing a polymerizable carbon-carbon double bond.
- a hydrocarbon group having 2 to 8 carbon atoms such as vinyl group, allyl group and isopropenyl group is preferable.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- the alkyl group having 1 to 5 carbon atoms may be linear, branched or cyclic, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group. Tert-butyl group, n-pentyl group, cyclohexyl group and the like.
- Specific examples of the aryl group having 6 to 20 carbon atoms include phenyl group, xylyl group, tolyl group, biphenylyl group, naphthyl group and the like.
- Specific examples of the aralkyl group having 7 to 20 carbon atoms include benzyl group, phenylethyl group, phenylcyclohexyl group and the like.
- oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position represented by the formula (1) include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-4-ethyl-2-oxazoline, 2-vinyl-4-propyl-2-oxazoline, 2-vinyl-4-butyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2- Vinyl-5-ethyl-2-oxazoline, 2-vinyl-5-propyl-2-oxazoline, 2-vinyl-5-butyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4- Methyl-2-oxazoline, 2-isopropenyl-4-ethyl-2-oxazoline, 2-isopropenyl-4-propyl-2-oxazoline, 2- Sopropenyl-4-butyl
- the oxazoline polymer is also preferably water-soluble.
- a water-soluble oxazoline polymer may be a homopolymer of the oxazoline monomer represented by the above formula (1), but has a oxazoline monomer and a hydrophilic functional group in order to further enhance the solubility in water (meta ) It is preferable to be obtained by radical polymerization of at least two monomers with an acrylate monomer.
- (meth) acrylic monomer having a hydrophilic functional group examples include (meth) acrylic acid, 2-hydroxyethyl acrylate, methoxypolyethylene glycol acrylate, monoesterified product of acrylic acid and polyethylene glycol, acrylic acid 2-aminoethyl and its salt, 2-hydroxyethyl methacrylate, methoxypolyethylene glycol methacrylate, monoesterified product of methacrylic acid and polyethylene glycol, 2-aminoethyl methacrylate and its salt, sodium (meth) acrylate, ( Ammonium methacrylate, (meth) acrylonitrile, (meth) acrylamide, N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, sodium styrenesulfonate, etc. The like, which may be used singly or may be used in combination of two or more. Among these, (meth) acrylic acid methoxypolyethylene glycol and mono
- (Meth) acrylic acid ester monomers such as perfluoroethyl acid and phenyl (meth) acrylate; ⁇ -olefin monomers such as ethylene, propylene, butene and pentene; haloolefins such as vinyl chloride, vinylidene chloride and vinyl fluoride Monomers: Styrene monomers such as styrene and ⁇ -methylstyrene; Vinyl ester monomers such as vinyl acetate and vinyl propionate; Vinyl ether monomers such as methyl vinyl ether and ethyl vinyl ether, and the like. Even two or more You may use it in combination.
- the content of the oxazoline monomer is preferably 10% by mass or more, more preferably 20% by mass from the viewpoint of further improving the conductive carbon material dispersibility of the obtained oxazoline polymer.
- the above is more preferable, and 30 mass% or more is even more preferable.
- the upper limit of the content rate of the oxazoline monomer in a monomer component is 100 mass%, and the homopolymer of an oxazoline monomer is obtained in this case.
- the content of the (meth) acrylic monomer having a hydrophilic functional group in the monomer component is preferably 10% by mass or more, more preferably 20% by mass or more from the viewpoint of further increasing the water solubility of the obtained oxazoline polymer. 30% by mass or more is even more preferable.
- the content of other monomers in the monomer component is in a range that does not affect the dispersibility of the obtained oxazoline polymer in the conductive carbon material as described above. However, it may be set appropriately in the range of 5 to 95% by mass, preferably 10 to 90% by mass.
- the average molecular weight of the oxazoline polymer is not particularly limited, but the weight average molecular weight is preferably 1,000 to 2,000,000, and more preferably 2,000 to 1,000,000.
- the weight average molecular weight is a polystyrene conversion value determined by gel permeation chromatography.
- the oxazoline polymer that can be used in the present invention can be synthesized by a conventional radical polymerization of the above-mentioned monomers, but can also be obtained as a commercial product, and as such a commercial product, for example, Epocross WS-300 (Manufactured by Nippon Shokubai Co., Ltd., solid content concentration 10% by mass, aqueous solution), Epocross WS-700 (manufactured by Nippon Shokubai Co., Ltd., solid content concentration 25% by mass, aqueous solution), Epocross WS-500 (manufactured by Nippon Shokubai Co., Ltd.) Manufactured, solid content concentration 39% by mass, water / 1-methoxy-2-propanol solution), Poly (2-ethyl-2-oxazoline) (Aldrich), Poly (2-ethyl-2-oxazoline) (AlfaAesar), Poly (2-ethyl-2-oxazole) (
- a triarylamine-based hyperbranched polymer obtained by condensation polymerization of triarylamines and aldehydes and / or ketones represented by the following formulas (2) and (3) under acidic conditions is also suitable. Used.
- Ar 1 to Ar 3 each independently represents any divalent organic group represented by formulas (4) to (8).
- the substituted or unsubstituted phenylene group represented by (4) is preferred.
- Z 1 and Z 2 are each independently a hydrogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or the formula (9) (1) represents any monovalent organic group represented by (12) (provided that Z 1 and Z 2 do not simultaneously become the above alkyl group), but Z 1 and Z 2 are each independently A hydrogen atom, a 2- or 3-thienyl group, or a group represented by the formula (9) is preferable, and in particular, one of Z 1 and Z 2 is a hydrogen atom, and the other is a hydrogen atom, 2- or More preferred is a 3-thienyl group, a group represented by the formula (9), particularly those in which R 141 is a phenyl group, or R 141 is a methoxy group.
- R 141 is a phenyl group
- an acidic group may be introduced onto the phenyl group when a method for introducing an acidic group after polymer production is used in the acidic group introduction method described later.
- alkyl group which may have a branched structure having 1 to 5 carbon atoms include those similar to those exemplified above.
- R 101 to R 138 are each independently a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a carbon number of 1 Represents an alkoxy group which may have a branched structure of 1 to 5, a carboxyl group, a sulfo group, a phosphoric acid group, a phosphonic acid group or a salt thereof;
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- examples of the alkyl group which may have a branched structure having 1 to 5 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n -Pentyl group and the like.
- alkoxy group which may have a branched structure having 1 to 5 carbon atoms include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, Examples thereof include an n-pentoxy group.
- salts of carboxyl group, sulfo group, phosphoric acid group and phosphonic acid group include alkali metal salts such as sodium and potassium; group 2 metal salts such as magnesium and calcium; ammonium salts; propylamine, dimethylamine, triethylamine, ethylenediamine, etc. Aliphatic amine salts; alicyclic amine salts such as imidazoline, piperazine and morpholine; aromatic amine salts such as aniline and diphenylamine; and pyridinium salts.
- R 139 to R 162 are each independently a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a carbon number of 1 Haloalkyl group, phenyl group, OR 163 , COR 163 , NR 163 R 164 , COOR 165 , which may have a branched structure of ⁇ 5 (in these formulas, R 163 and R 164 are each independently hydrogen Represents an atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, a haloalkyl group which may have a branched structure having 1 to 5 carbon atoms, or a phenyl group, and R 165 represents the number of carbon atoms Represents an alkyl group which may have a branched structure of 1 to 5, a haloalkyl group which may have a branched structure of 1 to 5 carbon
- the haloalkyl group which may have a branched structure having 1 to 5 carbon atoms includes difluoromethyl group, trifluoromethyl group, bromodifluoromethyl group, 2-chloroethyl group, 2-bromoethyl group, 1,1 -Difluoroethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2-tetrafluoroethyl group, 2-chloro-1,1,2-trifluoroethyl group, pentafluoroethyl group, 3 -Bromopropyl group, 2,2,3,3-tetrafluoropropyl group, 1,1,2,3,3,3-hexafluoropropyl group, 1,1,1,3,3,3-hexafluoropropane Examples include -2-yl group, 3-bromo-2-methylpropyl group, 4-bromobutyl group, perfluoropentyl group and the like. Examples of the halogen
- the hyperbranched polymer has a carboxyl group, in at least one aromatic ring of the repeating unit represented by the formula (2) or (3), Those having at least one acidic group selected from a sulfo group, a phosphoric acid group, a phosphonic acid group, and salts thereof are preferable, and those having a sulfo group or a salt thereof are more preferable.
- aldehyde compound used for the production of the hyperbranched polymer examples include formaldehyde, paraformaldehyde, acetaldehyde, propylaldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, capronaldehyde, 2-methylbutyraldehyde, hexylaldehyde, undecylaldehyde, 7 -Saturated aliphatic aldehydes such as methoxy-3,7-dimethyloctylaldehyde, cyclohexanecarboxaldehyde, 3-methyl-2-butyraldehyde, glyoxal, malonaldehyde, succinaldehyde, glutaraldehyde, adipine aldehyde; acrolein, methacrolein Unsaturated aldehydes such as: furfural, pyridine aldehy
- Examples of the ketone compound used in the production of the hyperbranched polymer include alkyl aryl ketones and diaryl ketones, such as acetophenone, propiophenone, diphenyl ketone, phenyl naphthyl ketone, dinaphthyl ketone, phenyl tolyl ketone, and ditolyl ketone. Etc.
- the hyperbranched polymer used in the present invention includes, for example, a triarylamine compound that can give the above-described triarylamine skeleton as represented by the following formula (A), for example, It is obtained by condensation polymerization of an aldehyde compound and / or a ketone compound represented by the formula (B) in the presence of an acid catalyst.
- a bifunctional compound (C) such as phthalaldehyde such as terephthalaldehyde is used as the aldehyde compound, not only the reaction shown in Scheme 1 but also the reaction shown in Scheme 2 below occurs.
- a hyperbranched polymer having a crosslinked structure in which two functional groups contribute to the condensation reaction may be obtained.
- an aldehyde compound and / or a ketone compound can be used at a ratio of 0.1 to 10 equivalents with respect to 1 equivalent of the aryl group of the triarylamine compound.
- the acid catalyst include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid; organic sulfonic acids such as p-toluenesulfonic acid and p-toluenesulfonic acid monohydrate; carboxylic acids such as formic acid and oxalic acid. Etc. can be used.
- the amount of the acid catalyst to be used is variously selected depending on the kind thereof, but is usually 0.001 to 10,000 parts by mass, preferably 0.01 to 1,000 parts by mass with respect to 100 parts by mass of the triarylamines. Part, more preferably 0.1 to 100 parts by weight.
- the above condensation reaction can be carried out without a solvent, it is usually carried out using a solvent.
- Any solvent that does not inhibit the reaction can be used.
- cyclic ethers such as tetrahydrofuran and 1,4-dioxane; N, N-dimethylformamide (DMF), N, N-dimethylacetamide ( DMAc), amides such as N-methyl-2-pyrrolidone (NMP); ketones such as methyl isobutyl ketone and cyclohexanone; halogenated hydrocarbons such as methylene chloride, chloroform, 1,2-dichloroethane and chlorobenzene; benzene, Examples thereof include aromatic hydrocarbons such as toluene and xylene, and cyclic ethers are particularly preferable.
- These solvents can be used alone or in combination of two or more.
- the acid catalyst used is a liquid such as formic acid, the acid catalyst can also serve as a solvent.
- the reaction temperature during the condensation is usually 40 to 200 ° C.
- the reaction time is variously selected depending on the reaction temperature, but is usually about 30 minutes to 50 hours.
- the obtained hyperbranched polymer may be introduced by a method of treating with a reagent capable of introducing an acidic group on the aromatic ring, but the latter method may be used in consideration of the ease of production. preferable.
- the method for introducing the acidic group onto the aromatic ring is not particularly limited, and may be appropriately selected from conventionally known various methods according to the type of the acidic group. For example, when a sulfo group is introduced, a technique of sulfonation using an excessive amount of sulfuric acid can be used.
- the average molecular weight of the hyperbranched polymer is not particularly limited, but the weight average molecular weight is preferably 1,000 to 2,000,000, and more preferably 2,000 to 1,000,000.
- Specific examples of the hyperbranched polymer include, but are not limited to, those represented by the following formula.
- the mixing ratio of the conductive carbon material such as CNT and the dispersant can be about 1,000: 1 to 1: 100 in terms of mass ratio.
- the concentration of the dispersant in the composition is not particularly limited as long as it is a concentration capable of dispersing the conductive carbon material in a solvent, but it should be about 0.001 to 30% by mass in the composition. It is more preferable that the content be about 0.002 to 20% by mass.
- the concentration of CNT in the composition varies in the weight per unit area of the target undercoat layer and the required mechanical, electrical, and thermal characteristics, and at least a part of the CNT, etc. Is as long as the undercoat layer can be produced in a range of practical weight per unit area, but is preferably about 0.0001 to 30% by mass, preferably about 0.001 to 20% by mass in the composition. More preferred is about 0.001 to 10% by mass.
- the solvent is not particularly limited as long as it is conventionally used for the preparation of a conductive composition.
- ethers such as tetrahydrofuran (THF), diethyl ether, 1,2-dimethoxyethane (DME); Halogenated hydrocarbons such as methylene chloride, chloroform, 1,2-dichloroethane; N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), etc.
- Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone
- Alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, t-butanol; n-heptane, n-hexane, cyclohexane, etc.
- Aliphatic hydrocarbons such as ethylene, xylene and ethylbenzene
- Aromatic hydrocarbons such as ethylene, xylene and ethylbenzene
- glycol ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and propylene glycol monomethyl ether
- organic solvents such as glycols such as ethylene glycol and propylene glycol .
- These solvent can be used individually by 1 type or in mixture of 2 or more types.
- water, NMP, DMF, THF, methanol, ethanol, n-propanol, isopropanol, n-butanol, and t-butanol are preferable because the ratio of isolated dispersion of CNT can be improved.
- methanol, ethanol, n-propanol, isopropanol, n-butanol, and t-butanol are preferable from the point that cost can be reduced.
- these solvents can be used singly or in combination of two or more for the purpose of increasing the ratio of isolated dispersion, increasing the coatability, and reducing the cost.
- a polymer serving as a matrix may be added.
- the matrix polymer include polyvinylidene fluoride (PVdF), polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer [P (VDF-HFP)], Fluorine resins such as vinylidene fluoride-trichloroethylene copolymer [P (VDF-CTFE)]; polyvinylpyrrolidone, ethylene-propylene-diene terpolymer, PE (polyethylene), PP (polypropylene), Polyolefin resins such as EVA (ethylene-vinyl acetate copolymer), EEA (ethylene-ethyl acrylate copolymer); PS (polystyrene), HIPS (high impact polystyrene), AS (acrylonitrile-st
- PVdF polyvin
- Examples thereof include sodium boxymethylcellulose, water-soluble cellulose ether, sodium alginate, polyvinyl alcohol, polystyrene sulfonic acid, polyethylene glycol and the like, and particularly, sodium polyacrylate and sodium carboxymethylcellulose are preferable.
- the matrix polymer can also be obtained as a commercial product.
- a commercial product examples include sodium polyacrylate (manufactured by Wako Pure Chemical Industries, Ltd., degree of polymerization 2,700 to 7,500), carboxy Sodium methylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.), sodium alginate (manufactured by Kanto Chemical Co., Ltd., deer grade 1), Metrol's SH series (hydroxypropylmethylcellulose, Shin-Etsu Chemical Co., Ltd.), Metrolose SE series (hydroxyl) Ethyl methyl cellulose, manufactured by Shin-Etsu Chemical Co., Ltd.), JC-25 (completely saponified polyvinyl alcohol, manufactured by Nippon Vineyard Poval Co., Ltd.), JM-17 (intermediate saponified polyvinyl alcohol, Nippon Vinegared / Poval) Manufactured by Co., Ltd.), JP-03 (partially saponified polyvinyl alcohol, Nippon Vinegar Po
- the composition of the present invention may contain a crosslinking agent that causes a crosslinking reaction with the dispersant to be used or a crosslinking agent that self-crosslinks. These crosslinking agents are preferably dissolved in the solvent used.
- the crosslinking agent for the oxazoline polymer is particularly limited as long as it is a compound having two or more functional groups having reactivity with an oxazoline group such as a carboxyl group, a hydroxyl group, a thiol group, an amino group, a sulfinic acid group, and an epoxy group. Although not intended, compounds having two or more carboxyl groups are preferred.
- a compound having a functional group that causes a crosslinking reaction by heating during thin film formation or in the presence of an acid catalyst such as a sodium salt, potassium salt, lithium salt, or ammonium salt of a carboxylic acid is also crosslinked. It can be used as an agent.
- an acid catalyst such as a sodium salt, potassium salt, lithium salt, or ammonium salt of a carboxylic acid
- Specific examples of compounds that undergo a crosslinking reaction with an oxazoline group include metal salts of synthetic polymers such as polyacrylic acid and copolymers thereof and natural polymers such as carboxymethylcellulose and alginic acid that exhibit crosslinking reactivity in the presence of an acid catalyst.
- ammonium salts of the above synthetic polymers and natural polymers that exhibit crosslinking reactivity by heating especially sodium polyacrylate that exhibits crosslinking reactivity in the presence of an acid catalyst or under heating conditions, Preference is given to lithium polyacrylate, ammonium polyacrylate, sodium carboxymethylcellulose, lithium carboxymethylcellulose, carboxymethylcellulose ammonium and the like.
- Such a compound that causes a crosslinking reaction with an oxazoline group can also be obtained as a commercial product.
- a commercial product examples include sodium polyacrylate (manufactured by Wako Pure Chemical Industries, Ltd., degree of polymerization of 2, 700-7,500), sodium carboxymethylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.), sodium alginate (manufactured by Kanto Chemical Co., Ltd., deer grade 1), Aron A-30 (ammonium polyacrylate, Toagosei Co., Ltd.) ), Solid concentration 32% by mass, aqueous solution), DN-800H (carboxymethylcellulose ammonium, manufactured by Daicel Finechem Co., Ltd.), ammonium alginate (produced by Kimika Co., Ltd.), and the like.
- crosslinking agent for the triarylamine-based hyperbranched polymer examples include melamine-based, substituted urea-based, or their polymer-based crosslinking agents. These crosslinking agents may be used alone or in combination of two or more. Can be used.
- the cross-linking agent has at least two cross-linking substituents, such as CYMEL (registered trademark), methoxymethylated glycoluril, butoxymethylated glycoluril, methylolated glycoluril, methoxymethylated melamine, butoxymethyl.
- Melamine methylolated melamine, methoxymethylated benzoguanamine, butoxymethylated benzoguanamine, methylolated benzoguanamine, methoxymethylated urea, butoxymethylated urea, methylolated urea, methoxymethylated thiourea, methoxymethylated thiourea, methylolated thio
- Examples include compounds such as urea, and condensates of these compounds.
- crosslinking agent examples include, for example, an aldehyde group, an epoxy group, a vinyl group, an isocyanate group, an alkoxy group, a carboxyl group, an aldehyde group, an amino group, an isocyanate group, an epoxy group, and an amino group.
- crosslinkable functional groups that react with each other in the same molecule, such as isocyanate groups and aldehyde groups, hydroxyl groups that react with the same crosslinkable functional groups (dehydration condensation), mercapto groups (disulfide bonds), Examples thereof include compounds having an ester group (Claisen condensation), a silanol group (dehydration condensation), a vinyl group, an acrylic group, and the like.
- Specific examples of the crosslinking agent that self-crosslinks include polyfunctional acrylate, tetraalkoxysilane, a monomer having a blocked isocyanate group, a hydroxyl group, a carboxylic acid, and an amino group that exhibit crosslinking reactivity in the presence of an acid catalyst.
- the block copolymer of the monomer which has is mentioned.
- Such a self-crosslinking crosslinking agent can also be obtained as a commercial product.
- a commercial product examples include A-9300 (ethoxylated isocyanuric acid triacrylate, Shin-Nakamura Chemical ( ), A-GLY-9E (Ethoxylatedinglycerine triacrylate (EO9 mol), Shin-Nakamura Chemical Co., Ltd.), A-TMMT (pentaerythritol tetraacrylate, Shin-Nakamura Chemical Co., Ltd.), tetraalkoxysilane In the case of tetramethoxysilane (manufactured by Tokyo Chemical Industry Co., Ltd.), tetraethoxysilane (manufactured by Toyoko Chemical Co., Ltd.), and polymers having a blocked isocyanate group, Elastron series E-37, H-3, H38, BAP, NEW BAP-15, C-52, F-2 9, W-11P, MF-9, MF-25K (D
- the amount of these crosslinking agents to be added varies depending on the solvent used, the substrate used, the required viscosity, the required film shape, etc., but is 0.001 to 80% by mass, preferably 0.8%, based on the dispersant. The amount is from 01 to 50% by mass, more preferably from 0.05 to 40% by mass.
- These cross-linking agents may cause a cross-linking reaction by self-condensation, but they cause a cross-linking reaction with the dispersant. If a cross-linkable substituent is present in the dispersant, the cross-linking reaction is caused by the cross-linkable substituent. Promoted.
- a catalyst for accelerating the crosslinking reaction p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid And / or a thermal acid generator such as 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, and organic sulfonic acid alkyl ester can be added.
- the addition amount of the catalyst is preferably 0.0001 to 20% by mass, more preferably 0.0005 to 10% by mass, and still more preferably 0.001 to 3% by mass with respect to the dispersant.
- the method for preparing the composition of the present invention is not particularly limited, and a conductive carbon material, a dispersant and a solvent, and a matrix polymer and a crosslinking agent used as necessary are mixed and dispersed in an arbitrary order. What is necessary is just to prepare a liquid. At this time, it is preferable to disperse the mixture, and this treatment can further improve the CNT dispersion ratio.
- the dispersion treatment include mechanical treatment, wet treatment using a ball mill, bead mill, jet mill, and the like, and ultrasonic treatment using a bath-type or probe-type sonicator. In particular, wet treatment using a jet mill. Or sonication is preferred.
- the time for the dispersion treatment is arbitrary, but is preferably about 1 minute to 10 hours, and more preferably about 5 minutes to 5 hours. At this time, heat treatment may be performed as necessary.
- heat treatment may be performed as necessary.
- the solid content concentration of the composition is not particularly limited, but considering the formation of the undercoat layer with a desired basis weight and film thickness, it is preferably 20% by mass or less, and 15% by mass. The following is more preferable, and 10 mass% or less is still more preferable. Moreover, the minimum is arbitrary, but 0.1 mass% or more is preferable from a practical viewpoint, 0.5 mass% or more is more preferable, and 1 mass% or more is still more preferable.
- solid content is the total amount of components other than the solvent which comprises a composition.
- An undercoat foil (composite current collector) can be produced by applying the composition described above to at least one surface of a current collector and naturally or heat-drying it to form an undercoat layer.
- the thickness of the undercoat layer is preferably 1 nm to 10 ⁇ m, more preferably 1 nm to 1 ⁇ m, and even more preferably 1 to 500 nm in consideration of reducing the internal resistance of the resulting device.
- the film thickness of the undercoat layer is, for example, by cutting out a test piece of an appropriate size from the undercoat foil, exposing the cross section by a technique such as tearing it by hand, and by microscopic observation such as a scanning electron microscope (SEM), It can obtain
- SEM scanning electron microscope
- Basis weight of the undercoat layer per one surface of the current collector is not particularly limited as long as it satisfies the above thickness is preferably 1,000 mg / m 2 or less, more preferably 500 mg / m 2, 300 mg / M 2 or less is even more preferable, and 200 mg / m 2 or less is more preferable.
- the basis weight of the undercoat layer per side of the current collector is preferably 1 mg / m 2 or more, more preferably 5 mg / m 2. m 2 or more, more preferably 10 mg / m 2 or more, and further preferably 15 mg / m 2 or more.
- the basis weight of the undercoat layer is the ratio of the mass (mg) of the undercoat layer to the area (m 2 ) of the undercoat layer.
- the area is an undercoat layer.
- the area is only the coat layer, and does not include the area of the current collector exposed between the undercoat layers formed in a pattern.
- the mass of the undercoat layer is obtained by, for example, cutting a test piece of an appropriate size from the undercoat foil, measuring its mass W0, and then peeling off the undercoat layer from the undercoat foil and peeling off the undercoat layer.
- the mass W1 is measured and calculated from the difference (W0-W1), or the mass W2 of the current collector is measured in advance, and then the mass W3 of the undercoat foil on which the undercoat layer is formed is measured.
- the difference (W3 ⁇ W2) can be calculated.
- Examples of the method for removing the undercoat layer include a method of immersing the undercoat layer in a solvent in which the undercoat layer dissolves or swells, and wiping the undercoat layer with a cloth or the like.
- the basis weight and the film thickness can be adjusted by a known method.
- the solid content concentration of the coating liquid for forming the undercoat layer (undercoat layer forming composition), the number of times of coating, the coating liquid inlet of the coating machine It can be adjusted by changing the clearance.
- the solid content concentration is increased, the number of coatings is increased, and the clearance is increased.
- the solid content concentration is lowered, the number of coatings is reduced, or the clearance is reduced.
- the current collector those conventionally used as current collectors for electrodes for energy storage devices can be used.
- copper, aluminum, titanium, stainless steel, nickel, gold, silver and alloys thereof, carbon materials, metal oxides, conductive polymers, etc. can be used, but welding such as ultrasonic welding is applied.
- a metal foil made of copper, aluminum, titanium, stainless steel, or an alloy thereof it is preferable to use a metal foil made of copper, aluminum, titanium, stainless steel, or an alloy thereof.
- the thickness of the current collector is not particularly limited, but is preferably 1 to 100 ⁇ m in the present invention.
- Examples of the method for applying the composition include spin coating, dip coating, flow coating, ink jet, casting, spray coating, bar coating, gravure coating, slit coating, roll coating, and flexographic printing.
- Method, transfer printing method, brush coating, blade coating method, air knife coating method, die coating method, etc., but from the point of work efficiency etc., inkjet method, casting method, dip coating method, bar coating method, blade coating method A roll coating method, a gravure coating method, a flexographic printing method, a spray coating method, and a die coating method are suitable.
- the temperature for drying by heating is also arbitrary, but is preferably about 50 to 200 ° C, more preferably about 80 to 150 ° C.
- the electrode for energy storage devices of the present invention can be produced by forming an electrode mixture layer on the undercoat layer.
- the energy storage device in the present invention include various energy storage devices such as an electric double layer capacitor, a lithium secondary battery, a lithium ion secondary battery, a proton polymer battery, a nickel hydrogen battery, an aluminum solid capacitor, an electrolytic capacitor, and a lead storage battery.
- the undercoat foil of the present invention can be suitably used for electric double layer capacitors and lithium ion secondary batteries.
- an active material the various active materials conventionally used for the electrode for energy storage devices can be used.
- a chalcogen compound capable of adsorbing / leaving lithium ions or a lithium ion-containing chalcogen compound, a polyanion compound, a simple substance of sulfur and a compound thereof may be used as a positive electrode active material. It can.
- the chalcogen compound that can adsorb and desorb lithium ions include FeS 2 , TiS 2 , MoS 2 , V 2 O 6 , V 6 O 13 , and MnO 2 .
- lithium ion-containing chalcogen compound examples include LiCoO 2 , LiMnO 2 , LiMn 2 O 4 , LiMo 2 O 4 , LiV 3 O 8 , LiNiO 2 , Li x Ni y M 1-y O 2 (where M is It represents at least one metal element selected from Co, Mn, Ti, Cr, V, Al, Sn, Pb, and Zn, and 0.05 ⁇ x ⁇ 1.10, 0.5 ⁇ y ⁇ 1.0 ) And the like.
- the polyanionic compound examples include LiFePO 4 .
- sulfur compound examples include Li 2 S and rubeanic acid.
- the negative electrode active material constituting the negative electrode at least one element selected from alkali metals, alkali metal alloys, elements of Groups 4 to 15 of the periodic table that occlude / release lithium ions, oxides, sulfides, A nitride or a carbon material capable of reversibly occluding and releasing lithium ions can be used.
- alkali metal include Li, Na, and K.
- alkali metal alloy include Li—Al, Li—Mg, Li—Al—Ni, Na—Hg, and Na—Zn.
- Examples of the simple substance of at least one element selected from Group 4 to 15 elements of the periodic table that store and release lithium ions include silicon, tin, aluminum, zinc, and arsenic.
- examples of the oxide include tin silicon oxide (SnSiO 3 ), lithium bismuth oxide (Li 3 BiO 4 ), lithium zinc oxide (Li 2 ZnO 2 ), lithium titanium oxide (Li 4 Ti 5 O 12 ), and oxidation.
- examples include titanium.
- examples of the sulfide include lithium iron sulfide (Li x FeS 2 (0 ⁇ x ⁇ 3)) and lithium copper sulfide (Li x CuS (0 ⁇ x ⁇ 3)).
- the carbon material capable of reversibly occluding and releasing lithium ions include graphite, carbon black, coke, glassy carbon, carbon fiber, carbon nanotube, and a sintered body thereof.
- a carbonaceous material can be used as an active material.
- the carbonaceous material include activated carbon and the like, for example, activated carbon obtained by carbonizing a phenol resin and then activating treatment.
- the electrode mixture layer is formed by applying an active material described above, an electrode slurry prepared by combining the binder polymer described below and a solvent as necessary, onto the undercoat layer, and then naturally or by heating and drying. can do.
- the binder polymer can be appropriately selected from known materials and used, for example, polyvinylidene fluoride (PVdF), polyvinylpyrrolidone, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride- Hexafluoropropylene copolymer [P (VDF-HFP)], vinylidene fluoride-trichloroethylene copolymer [P (VDF-CTFE)], polyvinyl alcohol, polyimide, ethylene-propylene-diene ternary copolymer Examples thereof include conductive polymers such as coalescence, styrene-butadiene rubber, carboxymethyl cellulose (CMC), polyacrylic acid (PAA), and polyaniline.
- PVdF polyvinylidene fluoride
- PVdF polyvinylidene fluoride
- PVDF-HFP vinylidene fluoride- Hexafluor
- the added amount of the binder polymer is preferably 0.1 to 20 parts by mass, particularly 1 to 10 parts by mass with respect to 100 parts by mass of the active material.
- the solvent include the solvents exemplified in the above solvent for the composition, and may be appropriately selected according to the type of the binder, but NMP is preferable in the case of a water-insoluble binder such as PVdF. In the case of a water-soluble binder such as PAA, water is preferable.
- the electrode slurry may contain a conductive material.
- the conductive material include carbon black, ketjen black, acetylene black, carbon whisker, carbon fiber, natural graphite, artificial graphite, titanium oxide, ruthenium oxide, aluminum, nickel and the like.
- Examples of the method for applying the electrode slurry include the same method as the method for applying the composition described above.
- the temperature for drying by heating is arbitrary, but is preferably about 50 to 400 ° C, more preferably about 80 to 150 ° C.
- the electrode may be pressed as necessary.
- the press pressure is preferably 1 kN / cm or more.
- the pressing method a generally adopted method can be used, but a die pressing method and a roll pressing method are particularly preferable.
- the pressing pressure is not particularly limited, but is preferably 2 kN / cm or more, and more preferably 3 kN / cm or more.
- the upper limit of the pressing pressure is preferably about 40 kN / cm, more preferably about 30 kN / cm.
- An energy storage device includes the above-described electrode for an energy storage device, and more specifically includes at least a pair of positive and negative electrodes, a separator interposed between these electrodes, and an electrolyte. And at least one of the positive and negative electrodes is composed of the energy storage device electrode described above. Since this energy storage device is characterized by the use of the above-described electrode for energy storage device as an electrode, other device constituent members such as separators and electrolytes may be appropriately selected from known materials and used. it can. Examples of the separator include a cellulose separator and a polyolefin separator.
- the electrolyte may be either liquid or solid, and may be either aqueous or non-aqueous.
- the electrode for an energy storage device of the present invention is practically sufficient even when applied to a device using a non-aqueous electrolyte. Performance can be demonstrated.
- non-aqueous electrolyte examples include a non-aqueous electrolyte obtained by dissolving an electrolyte salt in a non-aqueous organic solvent.
- electrolyte salts include lithium salts such as lithium tetrafluoroborate, lithium hexafluorophosphate, lithium perchlorate, and lithium trifluoromethanesulfonate; tetramethylammonium hexafluorophosphate, tetraethylammonium hexafluorophosphate, tetrapropylammonium hexa Quaternary ammonium salts such as fluorophosphate, methyltriethylammonium hexafluorophosphate, tetraethylammonium tetrafluoroborate, tetraethylammonium perchlorate, lithium imides such as lithium bis (trifluoromethanesulfonyl) imide, lithium bis (fluo
- non-aqueous organic solvent examples include alkylene carbonates such as propylene carbonate, ethylene carbonate, and butylene carbonate; dialkyl carbonates such as dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate; nitriles such as acetonitrile; and amides such as dimethylformamide. .
- the form of the energy storage device is not particularly limited, and conventionally known various types of cells such as a cylindrical type, a flat wound square type, a laminated square type, a coin type, a flat wound laminated type, and a laminated laminate type are adopted. can do.
- the above-described electrode for an energy storage device of the present invention may be used by punching it into a predetermined disk shape.
- a lithium ion secondary battery one electrode is placed on a lid to which a washer and a spacer of a coin cell are welded, and a separator of the same shape impregnated with an electrolytic solution is stacked thereon.
- the energy storage device electrode of the present invention can be overlaid with the composite material layer facing down, a case and a gasket can be placed thereon, and sealed with a coin cell caulking machine.
- the electrode mixture layer is welded to the metal tab at the portion where the electrode mixture layer is not formed (welded part) in the electrode formed on part or the entire surface of the undercoat layer.
- the obtained electrode structure may be used.
- the basis weight of the undercoat layer per surface of the current collector is preferably 0.1 g / m 2 or less, more preferably 0.09 g / m 2 or less, even more preferably less than 0.05 g / m 2.
- one or a plurality of electrodes constituting the electrode structure may be used, but generally a plurality of positive and negative electrodes are used.
- the plurality of electrodes for forming the positive electrode are preferably alternately stacked one by one with the plurality of electrodes for forming the negative electrode, and the separator described above is interposed between the positive electrode and the negative electrode. It is preferable. Even if the metal tab is welded at the welded portion of the outermost electrode of the plurality of electrodes, the metal tab is welded with the metal tab sandwiched between the welded portions of any two adjacent electrodes among the plurality of electrodes. Also good.
- the material of the metal tab is not particularly limited as long as it is generally used for energy storage devices.
- metal such as nickel, aluminum, titanium, copper; stainless steel, nickel alloy, aluminum alloy
- An alloy such as a titanium alloy or a copper alloy can be used, but in view of welding efficiency, an alloy including at least one metal selected from aluminum, copper and nickel is preferable.
- the shape of the metal tab is preferably a foil shape, and the thickness is preferably about 0.05 to 1 mm.
- a known method used for metal-to-metal welding can be used. Specific examples thereof include TIG welding, spot welding, laser welding, ultrasonic welding, and the like. It is preferable to join the metal tab.
- a technique of ultrasonic welding for example, a plurality of electrodes are arranged between an anvil and a horn, a metal tab is arranged in a welded portion, and ultrasonic welding is applied to collect a plurality of electrodes. The technique of welding first and then welding a metal tab is mentioned.
- the metal tab and the electrode are not only welded at the welded portion, but a plurality of electrodes are also ultrasonically welded to each other.
- the pressure, frequency, output, processing time, and the like during welding are not particularly limited, and may be set as appropriate in consideration of the material used, the presence or absence of the undercoat layer, the basis weight, and the like.
- the electrode structure produced as described above is housed in a laminate pack, and after injecting the above-described electrolyte, heat sealing is performed to obtain a laminate cell.
- the composition of the present invention is suitable as a composition for forming an undercoat layer that joins a current collector constituting an electrode of an energy storage device and an active material layer. It can also be used as a conductive carbon material dispersion for forming a conductive coating film other than the coating layer.
- undercoat solution [Example 1-1] 4. Epocros WS-300 (made by Nippon Shokubai Co., Ltd., solid concentration 10% by weight, weight average molecular weight 1.2 ⁇ 10 5 , oxazoline group amount 7.7 mmol / g) which is an aqueous solution containing an oxazoline polymer as a dispersant.
- Aron A-30 (Toagosei Co., Ltd., solid content concentration 31.6% by mass) which is an aqueous solution containing ammonium polyacrylate (PAA-NH 4 ), 41.35 g of pure water, 7.44 g of 2-propanol (manufactured by Junsei Chemical Co., Ltd., reagent special grade) was mixed to prepare an undercoat liquid (solid content concentration: 1.38% by mass).
- Example 1-1 An undercoat solution was prepared in the same manner as in Example 1-1 except that the conductive carbon material was changed to Baytubes (multilayer CNT manufactured by BAYER).
- Example 1-2 An undercoat solution was prepared in the same manner as in Example 1-1, except that the conductive carbon material was changed to Denka Black (manufactured by Denka Co., Ltd., carbon black).
- Example 1-3 An undercoat solution was prepared in the same manner as in Example 1-1, except that the conductive carbon material was changed to EC600JD (manufactured by Lion Corporation, Ketjen Black).
- Example 2-1 Production of electrode and secondary battery
- the undercoat liquid of Example 1-1 was uniformly spread on an aluminum foil (thickness 15 ⁇ m) as a current collector with a wire bar coater (OSP-13, wet film thickness 13 ⁇ m), and then dried at 150 ° C. for 30 minutes.
- An undercoat layer was formed to prepare an undercoat foil. 20 sheets of undercoat foil cut into 5 ⁇ 10 cm were prepared. After measuring the mass, the undercoat layer was scraped off with a paper soaked with a 1: 1 (mass ratio) mixture of 2-propanol and water. The mass of the metal foil was measured, and the basis weight of the undercoat layer calculated from the difference in mass before and after scraping was 150 mg / m 2 .
- LiF lithium iron phosphate
- PVdF polyvinylidene fluoride
- NMP N-methylpyrrolidone
- the obtained electrode slurry was spread uniformly on the previously prepared undercoat foil (wet film thickness 100 ⁇ m), then dried at 80 ° C. for 30 minutes, then at 120 ° C. for 30 minutes, and the electrode mixture layer on the undercoat layer Then, the electrode was produced by pressure bonding with a roll press.
- Example 2-4 A test secondary battery was fabricated in the same manner as in Example 2-1, except that a solid aluminum foil was used as the current collector.
- Example 2-1 The characteristics of the secondary batteries produced in Example 2-1 and Comparative Examples 2-1 to 2-4 were evaluated.
- the conditions shown in Table 3 are used in the order of battery aging, DC resistance measurement, cycle characteristic evaluation, and DC resistance measurement using a charge / discharge measuring device. A charge / discharge test was conducted. Table 4 shows the obtained results.
- Example 2-1 As shown in Table 4, in the secondary battery produced in Example 2-1, as the conductive carbon material for forming the undercoat layer, a conductive carbon material having a density in the range specified in the present invention was used. Therefore, it can be seen that the direct current resistance of the battery is low and the increase in resistance after the cycle test is suppressed as compared with the batteries manufactured in Comparative Examples 2-1 to 2-4.
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Abstract
Description
中でも、リチウムイオン二次電池は、高エネルギー密度、高電圧を有し、また充放電時におけるメモリー効果が無いことなどから、現在最も精力的に開発が進められている二次電池である。
また、近年の環境問題への取り組みから、電気自動車の開発も活発に進められており、その動力源としての二次電池には、より高い性能が求められるようになってきている。
正極および負極は、一般的に、リチウムを吸蔵、放出できる活物質と、主に炭素材料からなる導電材、さらにポリマーバインダーを含む組成物を、銅箔やアルミニウム箔などの集電体上に塗布することで製造される。このバインダーは、活物質と導電材、さらにこれらと金属箔を接着するために用いられ、ポリフッ化ビニリデン(PVdF)などのN-メチルピロリドン(NMP)に可溶なフッ素系樹脂や、オレフィン系重合体の水分散体などが市販されている。
さらに、長期間の使用により、電解液によるバインダーの膨潤や、活物質のリチウム吸蔵、放出による体積変化に伴う電極合材の体積変化により、電極合材と集電体間の接触抵抗が増大したり、活物質や導電材の一部が集電体から剥離、脱落したりすることによる電池容量の劣化が起こるという問題や、さらには安全性の点で問題もある。
例えば、特許文献1では、炭素を導電性フィラーとする導電層をアンダーコート層として、集電体と電極合材層との間に配設する技術が開示されており、アンダーコート層を備えた複合集電体を用いることで、集電体と電極合材層の間の接触抵抗を低減でき、かつ、高速放電時の容量減少も抑制でき、さらに電池の劣化をも抑制できることが示され、また、特許文献2や特許文献3でも同様の技術が開示されている。
さらに、特許文献4や特許文献5では、カーボンナノチューブ(以下、CNTとも略記する)を導電性フィラーとしたアンダーコート層が開示されている。
この点、どのような導電性炭素材料を用いた場合に、電池を低抵抗化することができ、かつ、抵抗の上昇を抑制できるかについての知見は明らかではない。
1. 導電性炭素材料、分散剤、および溶媒を含み、
上記導電性炭素材料の粉体に20kN/cm2の圧力を印加した時に測定される密度が、1.15g/cm3以上であることを特徴とするエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
2. 上記密度が、1.18g/cm3以上である1のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
3. 上記密度が、1.20g/cm3以上である2のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
4. 上記密度が、1.25g/cm3以上である3のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
5. 上記密度が、1.30g/cm3以上である4のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
6. 上記導電性炭素材料が、カーボンナノチューブを含む1~5のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
7. 固形分濃度が、20質量%以下である1~6のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
8. 上記固形分濃度が、15質量%以下である7のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
9. 上記固形分濃度が、10質量%以下である8のエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
10. 上記溶媒が、水を含む1~9のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
11. 上記溶媒が、アルコールを含む1~10のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
12. 上記溶媒が、水とアルコールとの混合溶媒である1~11のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
13. 上記分散剤が、側鎖にオキサゾリン基を含むビニル系ポリマーまたはトリアリールアミン系高分岐ポリマーを含む1~12のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物、
14. 1~13のいずれかのエネルギー貯蔵デバイスのアンダーコート層形成用組成物から得られるアンダーコート層、
15. 目付量が、1,000mg/m2以下である14のエネルギー貯蔵デバイス用アンダーコート層、
16. 上記目付量が、500mg/m2以下である15のエネルギー貯蔵デバイス用アンダーコート層、
17. 上記目付量が、300mg/m2以下である16のエネルギー貯蔵デバイス用アンダーコート層、
18. 上記目付量が、200mg/m2以下である17のエネルギー貯蔵デバイス用アンダーコート層、
19. 14~18のいずれかのアンダーコート層を備えるエネルギー貯蔵デバイスの電極用複合集電体、
20. 19のエネルギー貯蔵デバイスの電極用複合集電体を備えるエネルギー貯蔵デバイス用電極、
21. 20のエネルギー貯蔵デバイス用電極を備えるエネルギー貯蔵デバイス、
22. リチウムイオン電池である21のエネルギー貯蔵デバイス、
23. 導電性炭素材料、分散剤、および溶媒を含み、
上記導電性炭素材料の粉体に20kN/cm2の圧力を印加した時に測定される密度が、1.15g/cm3以上であることを特徴とする導電性炭素材料分散液、
24. 23の導電性炭素材料分散液から得られる導電性塗工膜
を提供する。
本発明に係るエネルギー貯蔵デバイスのアンダーコート層形成用組成物は、導電性炭素材料、分散剤、および溶媒を含み、導電性炭素材料の粉体に20kN/cm2の圧力を印加した時に測定される密度が1.15g/cm3以上であることを特徴とする。
なお、本発明における導電性炭素材料の密度は、嵩密度を意味する。上記密度は、公知の粉体抵抗測定システム、例えば、(株)三菱ケミカルアナリテック製、粉体抵抗測定システムMCP-PD51型を用いて測定することができる。
なお、上記の方法でSWCNT、DWCNTまたはMWCNTを作製する際には、ニッケル、鉄、コバルト、イットリウムなどの触媒金属も残存することがあるため、この不純物を除去するための精製を必要とする場合がある。不純物の除去には、硝酸、硫酸などによる酸処理とともに超音波処理が有効である。しかし、硝酸、硫酸などによる酸処理ではCNTを構成するπ共役系が破壊され、CNT本来の特性が損なわれてしまう可能性があるため、適切な条件で精製して使用することが望ましい。
このような観点から、本発明の組成物に用いられるCNTは、くびれ部を有するものが好ましい。くびれ部を有するCNTとは、CNTのウォールに、平行部と平行部のチューブ外径に対して90%以下のチューブ外径であるくびれ部とを有するものである。
このくびれ部は、CNTの成長方向が変更されることで作り出される部位であるため、結晶不連続部を有しており、小さな機械的エネルギーで容易に切断できる易破断箇所となる。
平行部1は、図1に示されるように、ウォールが2本の平行な直線または2本の平行な曲線と認識できる部分である。この平行部1において、平行線の法線方向のウォールの外壁間の距離が平行部1のチューブ外径2である。
一方、くびれ部3は、その両端が平行部1と連接し、平行部1に比べてウォール間の距離が近づいている部分であり、より具体的には、平行部1のチューブ外径2に対して90%以下のチューブ外径4を持つ部分である。なお、くびれ部3のチューブ外径4は、くびれ部3において、外壁を構成するウォールが最も近い箇所の外壁間距離である。図1に示されるように、くびれ部3の多くには結晶が不連続である箇所が存在する。
上記CNTのウォールの形状とチューブ外径は、透過型電子顕微鏡等で観察することができる。具体的には、CNTの0.5%分散液を作製し、その分散液を試料台にのせて乾燥させ、透過型電子顕微鏡で5万倍にて撮影した画像によりくびれ部を確認することができる。
上記CNTは、CNTの0.1%分散液を作製し、その分散液を試料台にのせて乾燥させ、透過型電子顕微鏡で2万倍にて撮影した画像を100nm四方の区画に区切り、100nm四方の区画にCNTの占める割合が10~80%である区画を300区画選択した際に、1区画中にくびれ部分が少なくとも1箇所存在する区画が300区画中に占める割合によって易破断箇所の全体に占める割合(易破断箇所の存在割合)を判断する。区画中のCNTの占める面積が10%未満の場合には、CNTの存在量が少なすぎるため測定が困難である。また、区画のCNTの占める面積が80%を超える場合には、区画に占めるCNTが多くなるためCNTが重なり合ってしまい、平行部分とくびれ部分を区別するのが困難であり正確な測定が困難となる。
本発明で用いるCNTにおいては、易破断箇所の存在割合が60%以上である。易破断箇所の存在割合が60%よりも少ない場合は、CNTが分散しにくく、分散させるために過度の機械的エネルギーを加えた時には、グラファイト綱面の結晶構造破壊につながり、CNTの特徴である電気導電性などの特性が低下する。より高い分散性を得るためには、易破断箇所の存在割合は、70%以上であることが好ましい。
グラフェンは、1原子の厚さのsp2結合炭素原子のシートであって、炭素原子とその結合からできた蜂の巣のような六角形格子構造をとっており、その厚さは、0.38nm程度と言われている。また、市販の酸化グラフェンの他に、グラファイトをHummers法により処理して得られる酸化グラフェンを用いてもよい。
オキサゾリンモノマーが有する重合性炭素-炭素二重結合含有基としては、重合性炭素-炭素二重結合を含んでいれば特に限定されるものではないが、重合性炭素-炭素二重結合を含む鎖状炭化水素基が好ましく、例えば、ビニル基、アリル基、イソプロペニル基などの炭素数2~8のアルケニル基等が好ましい。
ここで、ハロゲン原子としては、フッ素原子、塩素原子、臭素原子、ヨウ素原子が挙げられる。
炭素数1~5のアルキル基としては、直鎖状、分岐鎖状、環状のいずれでもよく、例えば、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、tert-ブチル基、n-ペンチル基、シクロヘキシル基等が挙げられる。
炭素数6~20のアリール基の具体例としては、フェニル基、キシリル基、トリル基、ビフェニリル基、ナフチル基等が挙げられる。
炭素数7~20のアラルキル基の具体例としては、ベンジル基、フェニルエチル基、フェニルシクロヘキシル基等が挙げられる。
このような水溶性のオキサゾリンポリマーは、上記式(1)で表されるオキサゾリンモノマーのホモポリマーでもよいが、水への溶解性をより高めるため、上記オキサゾリンモノマーと親水性官能基を有する(メタ)アクリル酸エステル系モノマーとの少なくとも2種のモノマーをラジカル重合させて得られたものであることが好ましい。
その他のモノマーの具体例としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸ブチル、(メタ)アクリル酸2-エチルヘキシル、(メタ)アクリル酸ステアリル、(メタ)アクリル酸パーフルオロエチル、(メタ)アクリル酸フェニル等の(メタ)アクリル酸エステルモノマー;エチレン、プロピレン、ブテン、ペンテン等のα-オレフィン系モノマー;塩化ビニル、塩化ビニリデン、フッ化ビニル等のハロオレフィン系モノマー;スチレン、α-メチルスチレン等のスチレン系モノマー;酢酸ビニル、プロピオン酸ビニル等のカルボン酸ビニルエステル系モノマー;メチルビニルエーテル、エチルビニルエーテル等のビニルエーテル系モノマー等が挙げられ、これらはそれぞれ単独で用いても、2種以上組み合わせて用いてもよい。
一方、得られるオキサゾリンポリマーの水溶性をより高めるという点から、モノマー成分における親水性官能基を有する(メタ)アクリル系モノマーの含有率は、10質量%以上が好ましく、20質量%以上がより好ましく、30質量%以上がより一層好ましい。
また、モノマー成分におけるその他の単量体の含有率は、上述のとおり、得られるオキサゾリンポリマーの導電性炭素材料分散能に影響を与えない範囲であり、また、その種類によって異なるため一概には決定できないが、5~95質量%、好ましくは10~90質量%の範囲で適宜設定すればよい。
なお、溶液として市販されている場合、そのまま使用しても、目的とする溶媒に置換してから使用してもよい。
なお、R141がフェニル基の場合、後述する酸性基導入法において、ポリマー製造後に酸性基を導入する手法を用いた場合、このフェニル基上に酸性基が導入される場合もある。
上記炭素数1~5の分岐構造を有していてもよいアルキル基としては、上記で例示したものと同様のものが挙げられる。
炭素数1~5の分岐構造を有していてもよいアルキル基としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、tert-ブチル基、n-ペンチル基等が挙げられる。
炭素数1~5の分岐構造を有していてもよいアルコキシ基としては、メトキシ基、エトキシ基、n-プロポキシ基、イソプロポキシ基、n-ブトキシ基、sec-ブトキシ基、tert-ブトキシ基、n-ペントキシ基等が挙げられる。
カルボキシル基、スルホ基、リン酸基およびホスホン酸基の塩としては、ナトリウム、カリウム等のアルカリ金属塩;マグネシウム、カルシウム等の2族金属塩;アンモニウム塩;プロピルアミン、ジメチルアミン、トリエチルアミン、エチレンジアミン等の脂肪族アミン塩;イミダゾリン、ピペラジン、モルホリン等の脂環式アミン塩;アニリン、ジフェニルアミン等の芳香族アミン塩;ピリジニウム塩などが挙げられる。
なお、ハロゲン原子、炭素数1~5の分岐構造を有していてもよいアルキル基としては、上記式(3)~(8)で例示した基と同様のものが挙げられる。
なお、アルデヒド化合物として、例えば、テレフタルアルデヒド等のフタルアルデヒド類のような、二官能化合物(C)を用いる場合、スキーム1で示される反応が生じるだけではなく、下記スキーム2で示される反応が生じ、2つの官能基が共に縮合反応に寄与した、架橋構造を有する高分岐ポリマーが得られる場合もある。
上記酸触媒としては、例えば、硫酸、リン酸、過塩素酸等の鉱酸類;p-トルエンスルホン酸、p-トルエンスルホン酸一水和物等の有機スルホン酸類;ギ酸、シュウ酸等のカルボン酸類などを用いることができる。
酸触媒の使用量は、その種類によって種々選択されるが、通常、トリアリールアミン類100質量部に対して、0.001~10,000質量部、好ましくは、0.01~1,000質量部、より好ましくは0.1~100質量部である。
また、使用する酸触媒が、例えば、ギ酸のような液状のものであるならば、酸触媒に溶媒としての役割を兼ねさせることもできる。
後者の手法において、酸性基を芳香環上に導入する手法としては、特に制限はなく、酸性基の種類に応じて従来公知の各種方法から適宜選択すればよい。
例えば、スルホ基を導入する場合、過剰量の硫酸を用いてスルホン化する手法などを用いることができる。
具体的な高分岐ポリマーとしては、下記式で示されるものが挙げられるが、これらに限定されるものではない。
また、組成物中における分散剤の濃度は、導電性炭素材料を溶媒に分散させ得る濃度であれば特に限定されるものではないが、組成物中に0.001~30質量%程度とすることが好ましく、0.002~20質量%程度とすることがより好ましい。
さらに、組成物中におけるCNTの濃度は、目的とするアンダーコート層の目付量や、要求される機械的、電気的、熱的特性などにおいて変化するものであり、また、少なくともCNT等の一部が孤立分散し、実用的な目付量範囲でアンダーコート層を作製できる限り任意であるが、組成物中に0.0001~30質量%程度とすることが好ましく、0.001~20質量%程度とすることがより好ましく、0.001~10質量%程度とすることがより一層好ましい。
マトリックス高分子の含有量は、特に限定されるものではないが、組成物中に、0.0001~99質量%程度とすることが好ましく、0.001~90質量%程度とすることがより好ましい。
オキサゾリンポリマーの架橋剤としては、例えば、カルボキシル基、水酸基、チオール基、アミノ基、スルフィン酸基、エポキシ基等のオキサゾリン基との反応性を有する官能基を2個以上有する化合物であれば特に限定されるものではないが、カルボキシル基を2個以上有する化合物が好ましい。なお、薄膜形成時の加熱や、酸触媒の存在下で上記官能基が生じて架橋反応を起こす官能基、例えば、カルボン酸のナトリウム塩、カリウム塩、リチウム塩、アンモニウム塩等を有する化合物も架橋剤として用いることができる。
オキサゾリン基と架橋反応を起こす化合物の具体例としては、酸触媒の存在下で架橋反応性を発揮する、ポリアクリル酸やそのコポリマー等の合成高分子およびカルボキシメチルセルロースやアルギン酸といった天然高分子の金属塩、加熱により架橋反応性を発揮する、上記合成高分子および天然高分子のアンモニウム塩等が挙げられるが、特に、酸触媒の存在下や加熱条件下で架橋反応性を発揮するポリアクリル酸ナトリウム、ポリアクリル酸リチウム、ポリアクリル酸アンモニウム、カルボキシメチルセルロースナトリウム、カルボキシメチルセルロースリチウム、カルボキシメチルセルロースアンモニウム等が好ましい。
自己架橋する架橋剤の具体例としては、酸触媒の存在下で架橋反応性を発揮する多官能アクリレート、テトラアルコキシシラン、ブロックイソシアネート基を有するモノマーおよび水酸基、カルボン酸、アミノ基の少なくとも1つを有するモノマーのブロックコポリマーなどが挙げられる。
本発明では、架橋反応を促進するための触媒として、p-トルエンスルホン酸、トリフルオロメタンスルホン酸、ピリジニウムp-トルエンスルホン酸、サリチル酸、スルホサリチル酸、クエン酸、安息香酸、ヒドロキシ安息香酸、ナフタレンカルボン酸等の酸性化合物、および/または2,4,4,6-テトラブロモシクロヘキサジエノン、ベンゾイントシレート、2-ニトロベンジルトシレート、有機スルホン酸アルキルエステル等の熱酸発生剤を添加することができる。
触媒の添加量は、分散剤に対して、好ましくは0.0001~20質量%、より好ましくは0.0005~10質量%、より一層好ましくは0.001~3質量%である。
この際、混合物を分散処理することが好ましく、この処理により、CNTの分散割合をより向上させることができる。分散処理としては、機械的処理である、ボールミル、ビーズミル、ジェットミル等を用いる湿式処理や、バス型やプローブ型のソニケータを用いる超音波処理が挙げられるが、特に、ジェットミルを用いた湿式処理や超音波処理が好適である。
分散処理の時間は任意であるが、1分間から10時間程度が好ましく、5分間から5時間程度がより好ましい。この際、必要に応じて加熱処理を施しても構わない。
なお、マトリックスポリマー等の任意成分を用いる場合、これらは、導電性炭素材料、分散剤および溶媒からなる混合物を調製した後から加えてもよい。
また、その下限は、任意であるが、実用的な観点から、0.1質量%以上が好ましく、0.5質量%以上がより好ましく、1質量%以上がより一層好ましい。
なお、固形分とは、組成物を構成する溶媒以外の成分の総量である。
アンダーコート層の厚みは、得られるデバイスの内部抵抗を低減することを考慮すると、1nm~10μmが好ましく、1nm~1μmがより好ましく、1~500nmがより一層好ましい。
アンダーコート層の膜厚は、例えば、アンダーコート箔から適当な大きさの試験片を切り出し、それを手で裂く等の手法により断面を露出させ、走査電子顕微鏡(SEM)等の顕微鏡観察により、断面部分でアンダーコート層が露出した部分から求めることができる。
一方、アンダーコート層の機能を担保して優れた特性の電池を再現性よく得るため、集電体の一面あたりのアンダーコート層の目付量を好ましくは1mg/m2以上、より好ましくは5mg/m2以上、より一層好ましくは10mg/m2以上、さらに好ましくは15mg/m2以上とする。
アンダーコート層の質量は、例えば、アンダーコート箔から適当な大きさの試験片を切り出し、その質量W0を測定し、その後、アンダーコート箔からアンダーコート層を剥離し、アンダーコート層を剥離した後の質量W1を測定し、その差(W0-W1)から算出する、あるいは、予め集電体の質量W2を測定しておき、その後、アンダーコート層を形成したアンダーコート箔の質量W3を測定し、その差(W3-W2)から算出することができる。
アンダーコート層を剥離する方法としては、例えばアンダーコート層が溶解、もしくは膨潤する溶剤に、アンダーコート層を浸漬させ、布等でアンダーコート層をふき取るなどの方法が挙げられる。
目付量や膜厚を多くしたい場合は、固形分濃度を高くしたり、塗布回数を増やしたり、クリアランスを大きくしたりする。目付量や膜厚を少なくしたい場合は、固形分濃度を低くしたり、塗布回数を減らしたり、クリアランスを小さくしたりする。
加熱乾燥する場合の温度も任意であるが、50~200℃程度が好ましく、80~150℃程度がより好ましい。
本発明におけるエネルギー貯蔵デバイスとしては、例えば、電気二重層キャパシタ、リチウム二次電池、リチウムイオン二次電池、プロトンポリマー電池、ニッケル水素電池、アルミ固体コンデンサ、電解コンデンサ、鉛蓄電池等の各種エネルギー貯蔵デバイスが挙げられるが、本発明のアンダーコート箔は、特に、電気二重層キャパシタ、リチウムイオン二次電池に好適に用いることができる。
ここで、活物質としては、従来、エネルギー貯蔵デバイス用電極に用いられている各種活物質を用いることができる。
例えば、リチウム二次電池やリチウムイオン二次電池の場合、正極活物質としてリチウムイオンを吸着・離脱可能なカルコゲン化合物またはリチウムイオン含有カルコゲン化合物、ポリアニオン系化合物、硫黄単体およびその化合物等を用いることができる。
このようなリチウムイオンを吸着離脱可能なカルコゲン化合物としては、例えば、FeS2、TiS2、MoS2、V2O6、V6O13、MnO2等が挙げられる。
リチウムイオン含有カルコゲン化合物としては、例えば、LiCoO2、LiMnO2、LiMn2O4、LiMo2O4、LiV3O8、LiNiO2、LixNiyM1-yO2(但し、Mは、Co、Mn、Ti、Cr、V、Al、Sn、Pb、およびZnから選ばれる少なくとも1種以上の金属元素を表し、0.05≦x≦1.10、0.5≦y≦1.0)などが挙げられる。
ポリアニオン系化合物としては、例えば、LiFePO4等が挙げられる。
硫黄化合物としては、例えば、Li2S、ルベアン酸等が挙げられる。
アルカリ金属としては、Li、Na、K等が挙げられ、アルカリ金属合金としては、例えば、Li-Al、Li-Mg、Li-Al-Ni、Na-Hg、Na-Zn等が挙げられる。
リチウムイオンを吸蔵放出する周期表4~15族の元素から選ばれる少なくとも1種の元素の単体としては、例えば、ケイ素やスズ、アルミニウム、亜鉛、砒素等が挙げられる。
同じく酸化物としては、例えば、スズケイ素酸化物(SnSiO3)、リチウム酸化ビスマス(Li3BiO4)、リチウム酸化亜鉛(Li2ZnO2)、リチウム酸化チタン(Li4Ti5O12)、酸化チタン等が挙げられる。
同じく硫化物としては、リチウム硫化鉄(LixFeS2(0≦x≦3))、リチウム硫化銅(LixCuS(0≦x≦3))等が挙げられる。
同じく窒化物としては、リチウム含有遷移金属窒化物が挙げられ、具体的には、LixMyN(M=Co、Ni、Cu、0≦x≦3、0≦y≦0.5)、リチウム鉄窒化物(Li3FeN4)等が挙げられる。
リチウムイオンを可逆的に吸蔵・放出可能な炭素材料としては、グラファイト、カーボンブラック、コークス、ガラス状炭素、炭素繊維、カーボンナノチューブ、またはこれらの焼結体等が挙げられる。
この炭素質材料としては、活性炭等が挙げられ、例えば、フェノール樹脂を炭化後、賦活処理して得られた活性炭が挙げられる。
なお、バインダーポリマーの添加量は、活物質100質量部に対して、0.1~20質量部、特に、1~10質量部が好ましい。
溶媒としては、上記組成物用の溶媒で例示した溶媒が挙げられ、それらの中からバインダーの種類に応じて適宜選択すればよいが、PVdF等の非水溶性のバインダーの場合はNMPが好適であり、PAA等の水溶性のバインダーの場合は水が好適である。
また、加熱乾燥する場合の温度も任意であるが、50~400℃程度が好ましく、80~150℃程度がより好ましい。
このエネルギー貯蔵デバイスは、電極として上述したエネルギー貯蔵デバイス用電極を用いることにその特徴があるため、その他のデバイス構成部材であるセパレータや、電解質などは、公知の材料から適宜選択して用いることができる。
セパレータとしては、例えば、セルロース系セパレータ、ポリオレフィン系セパレータなどが挙げられる。
電解質としては、液体、固体のいずれでもよく、また水系、非水系のいずれでもよいが、本発明のエネルギー貯蔵デバイス用電極は、非水系電解質を用いたデバイスに適用した場合にも実用上十分な性能を発揮させ得る。
電解質塩としては、4フッ化硼酸リチウム、6フッ化リン酸リチウム、過塩素酸リチウム、トリフルオロメタンスルホン酸リチウム等のリチウム塩;テトラメチルアンモニウムヘキサフルオロホスフェート、テトラエチルアンモニウムヘキサフルオロホスフェート、テトラプロピルアンモニウムヘキサフルオロホスフェート、メチルトリエチルアンモニウムヘキサフルオロホスフェート、テトラエチルアンモニウムテトラフルオロボレート、テトラエチルアンモニウムパークロレート等の4級アンモニウム塩、リチウムビス(トリフルオロメタンスルホニル)イミド、リチウムビス(フルオロスルホニル)イミド等のリチウムイミドなどが挙げられる。
非水系有機溶媒としては、プロピレンカーボネート、エチレンカーボネート、ブチレンカーボネート等のアルキレンカーボネート;ジメチルカーボネート、メチルエチルカーボネート、ジエチルカーボネート等のジアルキルカーボネート;アセトニトリル等のニトリル類、ジメチルホルムアミド等のアミド類などが挙げられる。
コイン型に適用する場合、上述した本発明のエネルギー貯蔵デバイス用電極を、所定の円盤状に打ち抜いて用いればよい。
例えば、リチウムイオン二次電池は、コインセルのワッシャーとスペーサーが溶接されたフタに、一方の電極を設置し、その上に、電解液を含浸させた同形状のセパレータを重ね、さらに上から、電極合材層を下にして本発明のエネルギー貯蔵デバイス用電極を重ね、ケースとガスケットを載せて、コインセルかしめ機で密封して作製することができる。
この場合、電極構造体を構成する電極は一枚でも複数枚でもよいが、一般的には、正負極とも複数枚が用いられる。
正極を形成するための複数枚の電極は、負極を形成するための複数枚の電極と、一枚ずつ交互に重ねることが好ましく、その際、正極と負極の間には上述したセパレータを介在させることが好ましい。
金属タブは、複数枚の電極の最も外側の電極の溶接部で溶接しても、複数枚の電極のうち、任意の隣接する2枚の電極の溶接部間に金属タブを挟んで溶接してもよい。
金属タブの形状は、箔状が好ましく、その厚さは0.05~1mm程度が好ましい。
超音波溶接の手法としては、例えば、複数枚の電極をアンビルとホーンとの間に配置し、溶接部に金属タブを配置して超音波をかけて一括して溶接する手法や、電極同士を先に溶接し、その後、金属タブを溶接する手法などが挙げられる。
本発明では、いずれの手法でも、金属タブと電極とが上記溶接部で溶接されるだけでなく、複数枚の電極同士も互いに超音波溶接されることになる。
溶接時の圧力、周波数、出力、処理時間等は、特に限定されるものではなく、用いる材料やアンダーコート層の有無、目付量などを考慮して適宜設定すればよい。
以上のようにして作製した電極構造体を、ラミネートパックに収納し、上述した電解液を注入した後、ヒートシールすることでラミネートセルが得られる。
(1)プローブ型超音波照射装置(分散処理)
Hielscher Ultrasonics社製、UIP1000
(2)ワイヤーバーコーター(アンダーコート層形成)
(株)エスエムテー製、PM-9050MC
(3)ホモディスパー(電極スラリーの混合)
プライミクス(株)製、T.K.ロボミックス(ホモディスパー2.5型(φ32)付き)
(4)薄膜旋回型高速ミキサー(電極スラリーの混合)
プライミクス(株)製、フィルミクス40型
(5)自転・公転ミキサー(電極スラリーの脱泡)
(株)シンキー製、あわとり練太郎(ARE-310)
(6)ロールプレス機(電極の圧縮)
有限会社タクミ技研製、SA-602
(7)充放電測定装置(二次電池評価)
東洋システム(株)製、TOSCAT-3100
(8)コインセルかしめ機
宝泉(株)製、手動コインカシメ機CR2032
(9)粉体抵抗測定システム
(株)三菱ケミカルアナリテック製、粉体抵抗測定システムMCP-PD51型および抵抗率計ロレスタGP
測定条件
4探針プローブ、電極間隔:3mm、電極半径:0.7mm、試料半径:10mm、印加圧力:4~25kN/cm2
密度および導電率の測定方法
導電性炭素材料1.0gを粉体抵抗測定システムの測定容器内に詰めた後に加圧を開始して、表1に示す条件で圧力を印加した時における密度および導電率を測定した。また、各圧力において測定された密度と導電率から最小二乗法により近似直線を求めた後、得られた近似直線から密度が1g/cm3の時に期待される導電率を算出した。
[実施例1-1]
分散剤としてオキサゾリンポリマーを含む水溶液であるエポクロスWS-300((株)日本触媒製、固形分濃度10質量%、重量平均分子量1.2×105、オキサゾリン基量7.7mmol/g)5.0gと、純水37.15gと、2-プロパノール(純正化学(株)製、試薬特級)7.35gとを混合し、さらにそこへ導電性炭素材料であるTC-2010(戸田工業(株)製、多層CNT)0.5gを混合した。得られた混合物に対して、プローブ型超音波照射装置を用いて30分間超音波処理を行い均一に導電性炭素材料が分散した分散液を調製した。これに、ポリアクリル酸アンモニウム(PAA-NH4)を含む水溶液であるアロンA-30(東亞合成(株)、固形分濃度31.6質量%)1.2gと、純水41.35gと、2-プロパノール(純正化学(株)製、試薬特級)7.44gを混合して、アンダーコート液(固形分濃度1.38質量%)を調製した。
導電性炭素材料を、Baytubes(BAYER社製、多層CNT)に変更した以外は、実施例1-1と同様の方法でアンダーコート液を調製した。
導電性炭素材料を、デンカブラック(デンカ(株)製、カーボンブラック)に変更した以外は、実施例1-1と同様の方法でアンダーコート液を調製した。
導電性炭素材料を、EC600JD(ライオン(株)製、ケッチェンブラック)に変更した以外は、実施例1-1と同様の方法でアンダーコート液を調製した。
[実施例2-1]
実施例1-1のアンダーコート液を、集電体であるアルミニウム箔(厚み15μm)にワイヤーバーコーター(OSP-13、ウェット膜厚13μm)で均一に展開した後、150℃で30分間乾燥してアンダーコート層を形成して、アンダーコート箔を作製した。
アンダーコート箔を5×10cmに切り出したものを20枚用意し、質量を測定後、2-プロパノールと水の1:1(質量比)混合液を染み込ませた紙でアンダーコート層を擦り落とした金属箔の質量を測定し、擦り落とす前後の質量差から算出したアンダーコート層の目付量は、150mg/m2であった。
得られた電極スラリーを、先に作製したアンダーコート箔に均一(ウェット膜厚100μm)に展開後、80℃で30分間、次いで120℃で30分間乾燥してアンダーコート層上に電極合材層を形成し、さらにロールプレス機で圧着することで電極を作製した。
2032型のコインセル(宝泉(株)製)のワッシャーとスペーサーが溶接されたフタに、直径14mmに打ち抜いたリチウム箔(本荘ケミカル(株)製、厚み0.17mm)を6枚重ねたものを設置し、その上に、電解液(キシダ化学(株)製、エチレンカーボネート:ジエチルカーボネート=1:1(体積比)、電解質であるリチウムヘキサフルオロホスフェートを1mol/L含む)を24時間以上染み込ませた、直径16mmに打ち抜いたセパレータ(セルガード(株)製、セルガード♯2400)を一枚重ねた。さらに上から、活物質を塗布した面を下にして電極を重ねた。電解液を1滴滴下した後、ケースとガスケットを載せて、コインセルかしめ機で密封した。その後、24時間静置し、試験用の二次電池を4個作製した。
実施例1-1のアンダーコート液の代わりに、それぞれ比較例1-1~1-3で得られたアンダーコート液を用いた以外は、実施例2-1と同様にして、アンダーコート箔および二次電池を作製した。
集電体として無垢のアルミニウム箔を用いた以外は、実施例2-1と同様にして試験用の二次電池を作製した。
・終始条件:2-4.5V
・温度:室温
・放電電圧:ステップ2および4において、各放電条件時の実放電容量を100%とし、10%放電した時点での電圧を放電電圧とした。
・直流抵抗:4個の試験用電池につき、ステップ2および4において、各放電条件時の電流値と放電電圧から直流抵抗を算出し、その平均値を求めた。
2 平行部のチューブ外径
3 くびれ部
4 くびれ部のチューブ外径
Claims (24)
- 導電性炭素材料、分散剤、および溶媒を含み、
上記導電性炭素材料の粉体に20kN/cm2の圧力を印加した時に測定される密度が、1.15g/cm3以上であることを特徴とするエネルギー貯蔵デバイスのアンダーコート層形成用組成物。 - 上記密度が、1.18g/cm3以上である請求項1記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記密度が、1.20g/cm3以上である請求項2記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記密度が、1.25g/cm3以上である請求項3記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記密度が、1.30g/cm3以上である請求項4記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記導電性炭素材料が、カーボンナノチューブを含む請求項1~5のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 固形分濃度が、20質量%以下である請求項1~6のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記固形分濃度が、15質量%以下である請求項7記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記固形分濃度が、10質量%以下である請求項8記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記溶媒が、水を含む請求項1~9のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記溶媒が、アルコールを含む請求項1~10のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記溶媒が、水とアルコールとの混合溶媒である請求項1~11のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 上記分散剤が、側鎖にオキサゾリン基を含むビニル系ポリマーまたはトリアリールアミン系高分岐ポリマーを含む請求項1~12のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物。
- 請求項1~13のいずれか1項記載のエネルギー貯蔵デバイスのアンダーコート層形成用組成物から得られるアンダーコート層。
- 目付量が、1,000mg/m2以下である請求項14記載のエネルギー貯蔵デバイス用アンダーコート層。
- 上記目付量が、500mg/m2以下である請求項15記載のエネルギー貯蔵デバイス用アンダーコート層。
- 上記目付量が、300mg/m2以下である請求項16記載のエネルギー貯蔵デバイス用アンダーコート層。
- 上記目付量が、200mg/m2以下である請求項17記載のエネルギー貯蔵デバイス用アンダーコート層。
- 請求項14~18のいずれか1項記載のアンダーコート層を備えるエネルギー貯蔵デバイスの電極用複合集電体。
- 請求項19記載のエネルギー貯蔵デバイスの電極用複合集電体を備えるエネルギー貯蔵デバイス用電極。
- 請求項20記載のエネルギー貯蔵デバイス用電極を備えるエネルギー貯蔵デバイス。
- リチウムイオン電池である請求項21記載のエネルギー貯蔵デバイス。
- 導電性炭素材料、分散剤、および溶媒を含み、
上記導電性炭素材料の粉体に20kN/cm2の圧力を印加した時に測定される密度が、1.15g/cm3以上であることを特徴とする導電性炭素材料分散液。 - 請求項23記載の導電性炭素材料分散液から得られる導電性塗工膜。
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