WO2014157423A1 - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
- Publication number
- WO2014157423A1 WO2014157423A1 PCT/JP2014/058691 JP2014058691W WO2014157423A1 WO 2014157423 A1 WO2014157423 A1 WO 2014157423A1 JP 2014058691 W JP2014058691 W JP 2014058691W WO 2014157423 A1 WO2014157423 A1 WO 2014157423A1
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- WIPO (PCT)
- Prior art keywords
- active material
- secondary battery
- power generation
- electrolyte secondary
- generation element
- Prior art date
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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
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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
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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
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Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery.
- a secondary battery that can be repeatedly charged and discharged is suitable as a power source for driving these motors, and a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery that can be expected to have a high capacity and a high output is attracting attention.
- the nonaqueous electrolyte secondary battery has a positive electrode active material layer containing a positive electrode active material (for example, LiCoO 2 , LiMnO 2 , LiNiO 2, etc.) formed on the surface of the current collector.
- a positive electrode active material for example, LiCoO 2 , LiMnO 2 , LiNiO 2, etc.
- the non-aqueous electrolyte secondary battery includes a negative electrode active material formed on the current collector surface (for example, carbonaceous materials such as metallic lithium, coke and natural / artificial graphite, metals such as Sn and Si, and oxide materials thereof) Etc.).
- the binder for binding the active material used in the active material layer is an organic solvent binder (a binder that does not dissolve / disperse in water but dissolves / disperses in an organic solvent) and an aqueous binder (a binder that dissolves / disperses in water). )are categorized.
- the organic solvent-based binder requires a large amount of cost for materials, recovery, and disposal of the organic solvent, which may be industrially disadvantageous.
- water-based binders make it easy to procure water as a raw material, and since steam is generated during drying, capital investment in the production line can be greatly suppressed, and the environmental burden is reduced. There is an advantage that you can. Further, the water-based binder has an advantage that the binding effect is large even in a small amount compared to the organic solvent-based binder, the active material ratio per volume can be increased, and the capacity of the negative electrode can be increased.
- JP 2010-80297 A discloses a non-aqueous electrolyte secondary battery in which polyvinyl alcohol and carboxymethyl cellulose are contained in a negative electrode active material layer together with a latex binder such as styrene butadiene rubber (SBR) which is an aqueous binder.
- SBR styrene butadiene rubber
- the amount of gas generated from the electrode during the first charge / discharge is larger than when an organic binder is used.
- the amount of gas generated increases, battery characteristics may be affected, and the battery capacity may be reduced particularly when the battery is used for a long period of time.
- the present invention provides a non-aqueous solution that can efficiently discharge the generated gas to the outside of the electrode when a water-based binder is used as the binder of the negative electrode active material layer, and the battery capacity does not decrease even when used for a long time.
- An object is to provide an electrolyte secondary battery.
- the nonaqueous electrolyte secondary battery according to the present invention has a configuration in which a power generation element is enclosed in an exterior body.
- the power generation element includes a positive electrode in which a positive electrode active material layer is formed on the surface of the positive electrode current collector, a negative electrode in which a negative electrode active material layer is formed on the surface of the negative electrode current collector, and a separator that holds an electrolytic solution And gas releasing means for discharging the gas generated inside the power generation element to an excess space inside the exterior body.
- the negative electrode active material layer includes a water-based binder, and a ratio value (V 2 / V 1 ) of the volume V 2 of the surplus space to the volume V 1 of pores of the power generation element is 0.5 to 1.0. There is a feature in a certain point.
- FIG. 1 is a schematic cross-sectional view showing a basic configuration of a non-aqueous electrolyte lithium ion secondary battery that is not a flat type (stacked type) bipolar type, which is an embodiment of an electric device. It is sectional drawing which expands and shows the edge part of the separator shown in FIG.
- FIG. 3A is a plan view of a nonaqueous electrolyte secondary battery which is a preferred embodiment of the present invention
- FIG. 3B is an arrow view from A in FIG.
- the present invention is a nonaqueous electrolyte secondary battery in which a power generation element is enclosed in an exterior body, wherein the power generation element includes a positive electrode in which a positive electrode active material layer is formed on the surface of a positive electrode current collector, A negative electrode in which a negative electrode active material layer containing a water-based binder is formed on the surface of the negative electrode current collector, a separator that holds an electrolytic solution, and a gas generated inside the power generation element to an excess space inside the exterior body And the ratio (V 2 / V 1 ) of the volume V 2 of the surplus space to the volume V 1 of the pores of the power generation element is 0.5 to 1.0.
- a non-aqueous electrolyte secondary battery is a non-aqueous electrolyte secondary battery.
- the gas generated at the electrode is external to the power generation element (outer package) through the gas releasing means. To the surplus space inside the body). The released gas is sufficiently held in the surplus space. As a result, a non-aqueous electrolyte secondary battery with little decrease in battery capacity even when used over a long period of time is possible.
- the water-based binder can use water as a solvent in producing the active material layer, there are various advantages and the binding force for binding the active material is high.
- the present inventors have found that when a water-based binder is used for the negative electrode active material layer, there is a problem that a large amount of gas is generated at the first charge / discharge compared to a negative electrode using an organic solvent-based binder. . This is because the water of the solvent used for dissolving (dispersing) the aqueous binder remains in the electrode, and this water decomposes into a gas, so that more gas is generated than the organic solvent binder. It is done.
- the size of the electrode is increased to improve the energy density. Heterogeneous reactions are also likely to occur.
- gas discharge means for discharging the gas generated inside the power generation element to the outside of the power generation element (specifically, the excess space inside the exterior body).
- the value (V 2 / V 1 ) of the ratio of the volume V 2 of the extra space in the exterior body to the volume V 1 of the pores of the power generation element is also controlled to a value within a predetermined range.
- the gas generated inside the power generation element is surely released to the outside of the power generation element (the surplus space inside the exterior body), and the released gas is sufficiently stored in the surplus space. Can be retained. As a result, the occurrence of adverse effects associated with gas generation is prevented, and battery performance (particularly durability) is improved.
- non-aqueous electrolyte lithium ion secondary battery will be described as a preferred embodiment of the non-aqueous electrolyte secondary battery, but is not limited to the following embodiment.
- the same elements are denoted by the same reference numerals, and redundant description is omitted.
- the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.
- FIG. 1 is a schematic cross-sectional view schematically showing a basic configuration of a non-aqueous electrolyte lithium ion secondary battery (hereinafter also simply referred to as “stacked battery”) that is not a flat (stacked) bipolar type.
- the stacked battery 10 of the present embodiment has a structure in which a substantially rectangular power generation element 21 in which a charge / discharge reaction actually proceeds is sealed inside a battery exterior material 29 that is an exterior body.
- the power generation element 21 has a configuration in which a positive electrode, a separator 17, and a negative electrode are stacked.
- the separator 17 contains a nonaqueous electrolyte (for example, a liquid electrolyte).
- the positive electrode has a structure in which the positive electrode active material layers 15 are disposed on both surfaces of the positive electrode current collector 12.
- the negative electrode has a structure in which the negative electrode active material layer 13 is disposed on both surfaces of the negative electrode current collector 11.
- the negative electrode, the electrolyte layer, and the positive electrode are laminated in this order so that one positive electrode active material layer 15 and the negative electrode active material layer 13 adjacent thereto face each other with a separator 17 therebetween.
- the adjacent positive electrode, electrolyte layer, and negative electrode constitute one unit cell layer 19. Therefore, it can be said that the stacked battery 10 shown in FIG. 1 has a configuration in which a plurality of single battery layers 19 are stacked and electrically connected in parallel.
- FIG. 1 has a configuration in which a plurality of single battery layers 19 are stacked and electrically connected in parallel.
- the separator 17 of the present embodiment is a separator in which a ceramic layer 17b as a heat-resistant insulating layer is laminated on at least one surface (both surfaces in FIG. 2) of the resin porous substrate 17a.
- the ceramic layer 17b which is a heat-resistant insulating layer, is a layer containing inorganic particles and a binder. In this way, in the separator 17 having the structure in which the ceramic layer 17b as the heat-resistant insulating layer is laminated, as shown in FIG. 2, the ceramic layer 17b generates gas generated inside the power generation element.
- gas release means for releasing into the surplus space 31 inside the exterior body located outside (arrow shown in FIG. 2).
- gas releasing means means that the gas generated during charging does not substantially remain inside the power generation element at the end of charging. Means to release.
- the negative electrode active material layer 13 is arrange
- the positive electrode current collector 12 and the negative electrode current collector 11 are each provided with a positive electrode current collector plate (tab) 27 and a negative electrode current collector plate (tab) 25 that are electrically connected to the respective electrodes (positive electrode and negative electrode). It has the structure led out of the battery exterior material 29 so that it may be pinched
- the positive electrode current collector 27 and the negative electrode current collector 25 are ultrasonically welded to the positive electrode current collector 12 and the negative electrode current collector 11 of each electrode, respectively, via a positive electrode lead and a negative electrode lead (not shown) as necessary. Or resistance welding or the like.
- FIG. 1 shows a flat battery (stacked battery) that is not a bipolar battery, but a positive electrode active material layer that is electrically coupled to one surface of the current collector and the opposite side of the current collector.
- a bipolar battery including a bipolar electrode having a negative electrode active material layer electrically coupled to the surface.
- one current collector also serves as a positive electrode current collector and a negative electrode current collector.
- the negative electrode active material layer includes a negative electrode active material.
- the negative electrode active material include carbon materials such as graphite (graphite), soft carbon, and hard carbon, lithium-transition metal composite oxides (for example, Li 4 Ti 5 O 12 ), metal materials, lithium alloy negative electrode materials, and the like. Is mentioned. In some cases, two or more negative electrode active materials may be used in combination. Preferably, from the viewpoint of capacity and output characteristics, a carbon material or a lithium-transition metal composite oxide is used as the negative electrode active material. Of course, negative electrode active materials other than those described above may be used.
- the average particle diameter of each active material contained in the negative electrode active material layer is not particularly limited, but is preferably 1 to 100 ⁇ m, more preferably 1 to 30 ⁇ m from the viewpoint of high output.
- the negative electrode active material layer contains at least an aqueous binder.
- water-based binders can be greatly reduced in capital investment on the production line and reduced environmental load because it is water vapor that occurs during drying. There is an advantage.
- the water-based binder refers to a binder using water as a solvent or a dispersion medium, and specifically includes a thermoplastic resin, a polymer having rubber elasticity, a water-soluble polymer, or a mixture thereof.
- the binder using water as a dispersion medium refers to a polymer that includes all expressed as latex or emulsion and is emulsified or suspended in water.
- kind a polymer latex that is emulsion-polymerized in a system that self-emulsifies.
- water-based binders include styrene polymers (styrene-butadiene rubber, styrene-vinyl acetate copolymer, styrene-acrylic copolymer, etc.), acrylonitrile-butadiene rubber, methyl methacrylate-butadiene rubber, ) Acrylic polymers (polyethyl acrylate, polyethyl methacrylate, polypropyl acrylate, polymethyl methacrylate (methyl methacrylate rubber), polypropyl methacrylate, polyisopropyl acrylate, polyisopropyl methacrylate, polybutyl acrylate, polybutyl methacrylate, polyhexyl acrylate , Polyhexyl methacrylate, polyethylhexyl acrylate, polyethylhexyl methacrylate, polylauryl acrylate, polylauryl meta Acrylate, etc.), polytyren
- the aqueous binder may contain at least one rubber binder selected from the group consisting of styrene-butadiene rubber, acrylonitrile-butadiene rubber, methyl methacrylate-butadiene rubber, and methyl methacrylate rubber from the viewpoint of binding properties. preferable. Furthermore, it is preferable that the water-based binder contains styrene-butadiene rubber because of good binding properties.
- Water-soluble polymers suitable for use in combination with styrene-butadiene rubber include polyvinyl alcohol and modified products thereof, starch and modified products thereof, cellulose derivatives (such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and salts thereof), polyvinyl Examples include pyrrolidone, polyacrylic acid (salt), or polyethylene glycol. Among them, it is preferable to combine styrene-butadiene rubber and carboxymethyl cellulose as a binder.
- the content of the aqueous binder is preferably 80 to 100% by mass, preferably 90 to 100% by mass, and preferably 100% by mass.
- the binder other than the water-based binder include binders used in the following positive electrode active material layer.
- the amount of the binder contained in the negative electrode active material layer is not particularly limited as long as it can bind the active material, but preferably 0.5 to 15% by mass with respect to the active material layer. More preferably, it is 1 to 10% by mass, and further preferably 2 to 4% by mass. Since the water-based binder has high binding power, the active material layer can be formed with a small amount of addition as compared with the organic solvent-based binder. Accordingly, the content of the aqueous binder in the active material layer is preferably 0.5 to 15% by mass, more preferably 1 to 10% by mass, and still more preferably 2% with respect to the active material layer. Is 4% by mass.
- the negative electrode active material layer further includes other additives such as a conductive additive, an electrolyte (polymer matrix, ion conductive polymer, electrolytic solution, etc.), and a lithium salt for improving ion conductivity, as necessary.
- the conductive assistant means an additive blended to improve the conductivity of the positive electrode active material layer or the negative electrode active material layer.
- the conductive auxiliary agent include carbon materials such as carbon black such as acetylene black, graphite, and carbon fiber.
- electrolyte salt examples include Li (C 2 F 5 SO 2 ) 2 N, LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiCF 3 SO 3 and the like.
- Examples of the ion conductive polymer include polyethylene oxide (PEO) and polypropylene oxide (PPO) polymers.
- the compounding ratio of the components contained in the negative electrode active material layer and the positive electrode active material layer described later is not particularly limited.
- the blending ratio can be adjusted by appropriately referring to known knowledge about lithium ion secondary batteries.
- the thickness of each active material layer is not particularly limited, and conventionally known knowledge about the battery can be appropriately referred to. As an example, the thickness of each active material layer is about 2 to 100 ⁇ m.
- the density of the negative electrode active material layer is preferably 1.4 to 1.6 g / cm 3 . If the density of the negative electrode active material layer is 1.6 g / cm 3 or less, the generated gas can sufficiently escape from the inside of the power generation element, and the long-term cycle characteristics can be further improved. In addition, when the density of the negative electrode active material layer is 1.4 g / cm 3 or less, the connectivity of the active material is ensured and the electron conductivity is sufficiently maintained. As a result, the battery performance can be further improved. Density of the negative electrode active material layer, since the effect of the present invention are exhibited more preferably from 1.35 ⁇ 1.65g / cm 3, more preferably at 1.42 ⁇ 1.53g / cm 3 is there.
- the density of the negative electrode active material layer represents the mass of the active material layer per unit volume. Specifically, after removing the negative electrode active material layer from the battery, removing the solvent and the like present in the electrolyte solution, the electrode volume is obtained from the long side, the short side, and the height, and after measuring the weight of the active material layer, It can be determined by dividing weight by volume.
- the surface centerline average roughness (Ra) of the surface on the separator side of the negative electrode active material layer is preferably 0.5 to 1.0 ⁇ m. If the center line average roughness (Ra) of the negative electrode active material layer is 0.5 ⁇ m or more, the long-term cycle characteristics can be further improved. This is considered to be because if the surface roughness is 0.5 ⁇ m or more, the gas generated in the power generation element is easily discharged out of the system. Moreover, if the centerline average roughness (Ra) of the negative electrode active material layer is 1.0 ⁇ m or less, the electron conductivity in the battery element is sufficiently secured, and the battery characteristics can be further improved.
- the centerline average roughness Ra means that only the reference length is extracted from the roughness curve in the direction of the average line, the x axis is in the direction of the average line of the extracted portion, and the y axis is in the direction of the vertical magnification.
- the value obtained by the following formula 1 is expressed in micrometers ( ⁇ m) (JIS-B0601-1994).
- Ra The value of Ra is measured by using a stylus type or non-contact type surface roughness meter that is generally widely used, for example, by a method defined in JIS-B0601-1994. There are no restrictions on the manufacturer or model of the device. In the examination in the present invention, Ra was obtained in accordance with the method defined in JIS-B0601 using a model number: Dektak3030 manufactured by SLOAN. Either the contact method (stylus type using a diamond needle or the like) or the non-contact method (non-contact detection using a laser beam or the like) can be used, but in the study in the present invention, the measurement was performed by the contact method.
- the surface roughness Ra specified in the present invention is measured at the stage where the active material layer is formed on the current collector in the manufacturing process.
- the measurement can be performed even after the battery is completed, and the results are almost the same as those in the manufacturing stage. Therefore, the surface roughness after the battery is completed may satisfy the above Ra range.
- the surface roughness of the negative electrode active material layer is that on the separator side of the negative electrode active material layer.
- the surface roughness of the negative electrode takes into account the active material shape, particle diameter, active material blending amount, etc. contained in the negative electrode active material layer, for example, by adjusting the press pressure during active material layer formation, etc. It can adjust so that it may become the said range.
- the shape of the active material varies depending on the type and manufacturing method, and the shape can be controlled by pulverization, for example, spherical (powder), plate, needle, column, square Etc. Therefore, in order to adjust the surface roughness in consideration of the shape used for the active material layer, active materials having various shapes may be combined.
- the hole cross-sectional area in the cross section in the stacking direction of the power generation element parallel to the rectangular short side which is the projected shape of the negative electrode active material layer is larger than the hole cross-sectional area in the cross section in the stacking direction of the power generation element parallel to the long side of the rectangle.
- the embodiment shown in FIG. 1 has a configuration in which the ceramic layer of the separator having a structure in which ceramic layers as heat-resistant insulating layers are laminated functions as “gas releasing means”. It is also possible to employ other configurations. For example, the form which provides the gas flow path for distribute
- the positive electrode active material layer contains an active material and, if necessary, other additives such as a conductive additive, a binder, an electrolyte (polymer matrix, ion conductive polymer, electrolyte, etc.), and a lithium salt for increasing ionic conductivity.
- a conductive additive such as aluminum silicate, aluminum silicate, magnesium silicate, magnesium silicate, magnesium silicate, magnesium silicate, magnesium silicate, magnesium silicate, etc.
- an electrolyte polymer matrix, ion conductive polymer, electrolyte, etc.
- a lithium salt for increasing ionic conductivity.
- the positive electrode active material layer includes a positive electrode active material.
- the positive electrode active material include LiMn 2 O 4 , LiCoO 2 , LiNiO 2 , Li (Ni—Mn—Co) O 2, and lithium-- such as those in which some of these transition metals are substituted with other elements.
- Examples include transition metal composite oxides, lithium-transition metal phosphate compounds, and lithium-transition metal sulfate compounds.
- two or more positive electrode active materials may be used in combination.
- a lithium-transition metal composite oxide is used as the positive electrode active material.
- NMC composite oxide Li (Ni—Mn—Co) O 2 and those in which some of these transition metals are substituted with other elements (hereinafter also simply referred to as “NMC composite oxide”) are used.
- the NMC composite oxide has a layered crystal structure in which a lithium atomic layer and a transition metal (Mn, Ni, and Co are arranged in order) are stacked alternately via an oxygen atomic layer.
- One Li atom is contained, and the amount of Li that can be taken out is twice that of the spinel lithium manganese oxide, that is, the supply capacity is doubled, so that a high capacity can be obtained.
- the NMC composite oxide includes a composite oxide in which a part of the transition metal element is substituted with another metal element.
- Other elements in that case include Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, Fe, B, Ga, In, Si, Mo, Y, Sn, V, Cu , Ag, Zn, etc., preferably Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, Cr, more preferably Ti, Zr, P, Al, Mg, From the viewpoint of improving cycle characteristics, Ti, Zr, Al, Mg, and Cr are more preferable.
- a represents the atomic ratio of Li
- b represents the atomic ratio of Ni
- c represents the atomic ratio of Co
- d represents the atomic ratio of Mn
- x represents the atomic ratio of M. Represents. From the viewpoint of cycle characteristics, it is preferable that 0.4 ⁇ b ⁇ 0.6 in the general formula (1).
- the composition of each element can be measured by, for example, inductively coupled plasma (ICP) emission spectrometry.
- ICP inductively coupled plasma
- Ni nickel
- Co cobalt
- Mn manganese
- Ti or the like partially replaces the transition metal in the crystal lattice. From the viewpoint of cycle characteristics, it is preferable that a part of the transition element is substituted with another metal element, and it is particularly preferable that 0 ⁇ x ⁇ 0.3 in the general formula (1). Since at least one selected from the group consisting of Ti, Zr, Nb, W, P, Al, Mg, V, Ca, Sr, and Cr is dissolved, the crystal structure is stabilized. It is considered that the battery capacity can be prevented from decreasing even if the above is repeated, and that excellent cycle characteristics can be realized.
- b, c and d are 0.44 ⁇ b ⁇ 0.51, 0.27 ⁇ c ⁇ 0.31, 0.19 ⁇ d ⁇ 0.26. It is preferable from the viewpoint of improving the balance between capacity and life characteristics.
- positive electrode active materials other than those described above may be used.
- the average particle diameter of each active material contained in the positive electrode active material layer is not particularly limited, but is preferably 1 to 100 ⁇ m, more preferably 1 to 20 ⁇ m from the viewpoint of increasing the output.
- a binder used for a positive electrode active material layer For example, the following materials are mentioned. Polyethylene, polypropylene, polyethylene terephthalate (PET), polyether nitrile, polyacrylonitrile, polyimide, polyamide, cellulose, carboxymethyl cellulose (CMC) and its salts, ethylene-vinyl acetate copolymer, polyvinyl chloride, styrene-butadiene rubber (SBR) ), Isoprene rubber, butadiene rubber, ethylene / propylene rubber, ethylene / propylene / diene copolymer, styrene / butadiene / styrene block copolymer and hydrogenated product thereof, styrene / isoprene / styrene block copolymer and hydrogenated product thereof.
- Thermoplastic polymers such as products, polyvinylidene fluoride (PVdF), polyt
- the amount of the binder contained in the positive electrode active material layer is not particularly limited as long as it is an amount capable of binding the active material, but preferably 0.5 to 15% by mass with respect to the active material layer. More preferably, it is 1 to 10% by mass.
- additives other than the binder the same additives as those in the negative electrode active material layer column can be used.
- the separator has a function of holding an electrolyte and ensuring lithium ion conductivity between the positive electrode and the negative electrode, and a function as a partition wall between the positive electrode and the negative electrode.
- the gas generation means is provided in the power generation element, and the value of V 2 / V 1 is further controlled to improve the release of the gas generated inside the power generation element.
- the gas releasing ability that has passed through the negative electrode active material layer and reached the separator. From such a viewpoint, it is more preferable to set the air permeability and porosity of the separator within appropriate ranges.
- the air permeability (Gurley value) of the separator is preferably 200 (seconds / 100 cc) or less.
- the air permeability of the separator is preferably 200 (seconds / 100 cc) or less.
- the lower limit of the air permeability is not particularly limited, but is usually 300 (second / 100 cc) or more.
- the air permeability of the separator is a value according to the measurement method of JIS P8117 (2009).
- the porosity of the separator is preferably 40 to 65%.
- the porosity a value obtained as a volume ratio from the density of the resin as the raw material of the separator and the density of the separator of the final product is adopted.
- the porosity is expressed by 100 ⁇ (1 ⁇ ′ / ⁇ ).
- separator examples include a separator made of a porous sheet made of a polymer or fiber that absorbs and holds the electrolyte and a nonwoven fabric separator.
- a microporous (microporous film) can be used as the separator of the porous sheet made of polymer or fiber.
- the porous sheet made of the polymer or fiber include polyolefins such as polyethylene (PE) and polypropylene (PP); a laminate in which a plurality of these are laminated (for example, three layers of PP / PE / PP) And a microporous (microporous membrane) separator made of a hydrocarbon resin such as polyimide, aramid, polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), glass fiber, and the like.
- PE polyethylene
- PP polypropylene
- a microporous (microporous membrane) separator made of a hydrocarbon resin such as polyimide, aramid, polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), glass fiber, and the like.
- the thickness of the microporous (microporous membrane) separator cannot be uniquely defined because it varies depending on the intended use. For example, in applications such as secondary batteries for driving motors such as electric vehicles (EV), hybrid electric vehicles (HEV), and fuel cell vehicles (FCV), it is 4 to 60 ⁇ m in a single layer or multiple layers. Is desirable.
- the fine pore diameter of the microporous (microporous membrane) separator is desirably 1 ⁇ m or less (usually a pore diameter of about several tens of nm).
- nonwoven fabric separator cotton, rayon, acetate, nylon, polyester; polyolefins such as PP and PE; conventionally known ones such as polyimide and aramid are used alone or in combination.
- the bulk density of the nonwoven fabric is not particularly limited as long as sufficient battery characteristics can be obtained by the impregnated electrolyte.
- the thickness of the nonwoven fabric separator may be the same as that of the electrolyte layer, and is preferably 5 to 200 ⁇ m, particularly preferably 10 to 100 ⁇ m.
- the separator may be a separator in which a heat-resistant insulating layer is laminated on at least one surface of the resin porous substrate.
- the heat-resistant insulating layer is a ceramic layer containing inorganic particles and a binder.
- the ceramic layer serves as a gas release means for releasing the gas generated inside the power generation element to the outside of the power generation element. Function.
- the separator includes an electrolyte.
- the electrolyte is not particularly limited as long as it can exhibit such a function, but a liquid electrolyte or a gel polymer electrolyte is used.
- the liquid electrolyte functions as a lithium ion carrier.
- the liquid electrolyte has a form in which a lithium salt is dissolved in an organic solvent.
- organic solvent include carbonates such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate.
- the lithium salt Li (CF 3 SO 2) 2 N, Li (C 2 F 5 SO 2) 2 N, LiPF 6, LiBF 4, LiClO 4, LiAsF 6, LiTaF such 6, LiCF 3 SO 3
- the liquid electrolyte may further contain additives other than the components described above.
- Such compounds include, for example, vinylene carbonate, methyl vinylene carbonate, dimethyl vinylene carbonate, phenyl vinylene carbonate, diphenyl vinylene carbonate, ethyl vinylene carbonate, diethyl vinylene carbonate, vinyl ethylene carbonate, 1,2-divinyl ethylene carbonate.
- vinylene carbonate, methyl vinylene carbonate, and vinyl ethylene carbonate are preferable, and vinylene carbonate and vinyl ethylene carbonate are more preferable.
- These cyclic carbonates may be used alone or in combination of two or more.
- the gel polymer electrolyte has a configuration in which the above liquid electrolyte is injected into a matrix polymer (host polymer) made of an ion conductive polymer.
- a gel polymer electrolyte as the electrolyte is superior in that the fluidity of the electrolyte is lost and the ion conductivity between the layers is easily cut off.
- the ion conductive polymer used as the matrix polymer (host polymer) include polyethylene oxide (PEO), polypropylene oxide (PPO), and copolymers thereof. In such polyalkylene oxide polymers, electrolyte salts such as lithium salts can be well dissolved.
- the matrix polymer of gel electrolyte can express excellent mechanical strength by forming a crosslinked structure.
- thermal polymerization, ultraviolet polymerization, radiation polymerization, electron beam polymerization, etc. are performed on a polymerizable polymer (for example, PEO or PPO) for forming a polymer electrolyte using an appropriate polymerization initiator.
- a polymerization treatment may be performed.
- examples of the metal include aluminum, nickel, iron, stainless steel, titanium, copper, and other alloys.
- a clad material of nickel and aluminum, a clad material of copper and aluminum, or a plating material of a combination of these metals can be preferably used.
- covered on the metal surface may be sufficient.
- aluminum, stainless steel, and copper are preferable from the viewpoints of electronic conductivity and battery operating potential.
- the size of the current collector is determined according to the intended use of the battery. For example, if it is used for a large battery that requires a high energy density, a current collector having a large area is used. There is no particular limitation on the thickness of the current collector.
- the thickness of the current collector is usually about 1 to 100 ⁇ m.
- the material which comprises a current collector plate (25, 27) is not restrict
- a constituent material of the current collector plate for example, metal materials such as aluminum, copper, titanium, nickel, stainless steel (SUS), and alloys thereof are preferable. From the viewpoint of light weight, corrosion resistance, and high conductivity, aluminum and copper are more preferable, and aluminum is particularly preferable.
- the positive electrode current collector plate 25 and the negative electrode current collector plate 27 may be made of the same material or different materials.
- the battery outer body 29 is a member that encloses the power generation element therein, and a bag-like case using a laminate film containing aluminum that can cover the power generation element can be used.
- a laminate film for example, a laminate film having a three-layer structure in which PP, aluminum, and nylon are laminated in this order can be used, but is not limited thereto.
- a laminate film is desirable from the viewpoint that it is excellent in high output and cooling performance, and can be suitably used for a battery for large equipment for EV and HEV.
- the exterior body is more preferably a laminate film containing aluminum.
- the internal volume of the battery exterior body 29 is configured to be larger than the volume of the power generation element 21 so that the power generation element 21 can be enclosed.
- the internal volume of the exterior body refers to the volume in the exterior body before evacuation after sealing with the exterior body.
- the volume of the power generation element is the volume of the space occupied by the power generation element, and includes a hole in the power generation element. Since the inner volume of the exterior body is larger than the volume of the power generation element, there is a space in which gas can be stored when gas is generated. Thereby, the gas release property from the power generation element is improved, the generated gas is less likely to affect the battery behavior, and the battery characteristics are improved.
- the value (V 2 / V 1 ) of the ratio of the volume V 2 of the surplus space inside the battery exterior body 29 to the volume V 1 of the pores of the power generation element 21 is 0.5 to 1. .0.
- the gas release from the power generation element can be further improved, and in particular, can contribute to the improvement of the long-term cycle characteristics of the battery.
- the volume of the pores of the power generation element is the total sum of the pores of each constituent member constituting the power generation element, and can be calculated from the electrode density, the true density of each constituent member, and the electrode basis weight. it can.
- the battery is usually manufactured by sealing the power generation element inside the exterior body, injecting an electrolytic solution, and evacuating and sealing the inside of the outer layer body.
- V 2 the value of V 2 / V 1 is essential to be 0.5 to 1.0, preferably 0.6 to 0.9, and more preferably 0.7 to 0.00. 8.
- the above-described surplus space present inside the exterior body is disposed at least vertically above the power generation element.
- the generated gas can be accumulated in the vertical upper part of the power generation element in which the surplus space exists.
- electrolyte solution can preferentially exist in the lower part in which an electric power generation element exists in an exterior body.
- the material or shape of the exterior body itself is placed on the side part or the lower part of the power generation element.
- it may be configured not to swell toward the outside, or a member that prevents the exterior body from bulging toward a side portion or a lower portion thereof may be disposed outside the exterior body.
- the electrolytic solution is injected after the power generation element is enclosed in the exterior body.
- the volume of the injected electrolytic solution The value of the ratio with the volume of the surplus space is controlled to a value within a predetermined range.
- the ratio value (L / V 2 ) of the volume (L) of the electrolyte injected into the exterior body to the volume V 2 of the excess space inside the exterior body is 0.4 to 0.7.
- the value of L / V 2 is preferably 0.45 to 0.65, more preferably 0.50 to 0.60.
- the negative electrode active material layer is preferably rectangular, and the length of the short side of the rectangle is preferably 100 mm or more.
- the length of the short side of the negative electrode active material layer refers to the side having the shortest length among the electrodes.
- the upper limit of the length of the short side of the battery structure is not particularly limited, but is usually 250 mm or less.
- the value of the ratio of the battery area to the rated capacity (the maximum value of the projected area of the battery including the battery outer casing) is 5 cm 2 / Ah or more, and the rated capacity is In a battery having a capacity of 3 Ah or more, since the battery area per unit capacity is large, the amount of gas generated is also increased, and non-uniform formation of a coating (SEI) on the surface of the negative electrode active material is likely to be promoted.
- SEI coating
- the nonaqueous electrolyte secondary battery according to the present embodiment is a battery having a large size as described above from the viewpoint that the merit due to the expression of the effects of the present invention is greater.
- the aspect ratio of the rectangular electrode is preferably 1 to 3, and more preferably 1 to 2. The electrode aspect ratio is defined as the aspect ratio of the rectangular positive electrode active material layer.
- the group pressure applied to the power generation element is preferably 0.07 to 0.7 kgf / cm 2 (6.86 to 68.6 kPa).
- the group pressure applied to the power generation element is 0.1 to 0.7 kgf / cm 2 (9.80 to 68.6 kPa).
- the group pressure refers to an external force applied to the power generation element, and the group pressure applied to the power generation element can be easily measured using a film-type pressure distribution measuring system. A value measured using a film-type pressure distribution measuring system is adopted.
- the control of the group pressure is not particularly limited, but can be controlled by applying an external force physically or directly to the power generation element and controlling the external force.
- a pressure member that applies pressure to the exterior body it is preferable to use. That is, a preferred embodiment of the present invention further includes a pressure member that applies pressure to the outer package so that the group pressure applied to the power generation element is 0.07 to 0.7 kgf / cm 2. It is a secondary battery.
- FIG. 3A is a plan view of a nonaqueous electrolyte secondary battery which is another preferred embodiment of the present invention
- FIG. 3B is an arrow view from A in FIG.
- the exterior body 1 enclosing the power generation element has a rectangular flat shape, and an electrode tab 4 for taking out electric power is drawn out from the side portion.
- the power generation element is wrapped by a battery outer package, and the periphery thereof is heat-sealed.
- the power generation element is sealed with the electrode tab 4 pulled out.
- the power generation element corresponds to the power generation element 21 of the lithium ion secondary battery 10 shown in FIG. 1 described above.
- FIG. 1 the power generation element 21 of the lithium ion secondary battery 10 shown in FIG. 1 described above.
- 2 is a SUS plate that is a pressure member
- 3 is a fixing jig that is a fixing member
- 4 is an electrode tab (negative electrode tab or positive electrode tab).
- the pressurizing member is disposed for the purpose of controlling the group pressure applied to the power generation element to be 0.07 to 0.7 kgf / cm 2 .
- the pressure member include a rubber material such as a urethane rubber sheet, and a metal plate such as aluminum and SUS.
- the fixing member for fixing the pressing member has a spring property. Further, the group pressure applied to the power generation element can be easily controlled by adjusting the fixing of the fixing jig to the pressing member.
- the tab removal shown in FIG. 3 is not particularly limited.
- the positive electrode tab and the negative electrode tab may be pulled out from both sides, or the positive electrode tab and the negative electrode tab may be divided into a plurality of parts and taken out from each side. It is not a thing.
- the assembled battery is configured by connecting a plurality of batteries. Specifically, at least two or more are used, and are configured by serialization, parallelization, or both. Capacitance and voltage can be freely adjusted by paralleling in series.
- a small assembled battery that can be attached and detached by connecting a plurality of batteries in series or in parallel. Then, a plurality of small assembled batteries that can be attached and detached are connected in series or in parallel to provide a large capacity and large capacity suitable for vehicle drive power supplies and auxiliary power supplies that require high volume energy density and high volume output density.
- An assembled battery having an output can also be formed. How many batteries are connected to make an assembled battery, and how many small assembled batteries are stacked to make a large-capacity assembled battery depends on the battery capacity of the mounted vehicle (electric vehicle) It may be determined according to the output.
- the electric device has excellent output characteristics, maintains discharge capacity even after long-term use, and has good cycle characteristics.
- Vehicle applications such as electric vehicles, hybrid electric vehicles, fuel cell vehicles, and hybrid fuel cell vehicles require higher capacity, larger size, and longer life than electric and portable electronic devices. . Therefore, the electric device can be suitably used as a vehicle power source, for example, a vehicle driving power source or an auxiliary power source.
- a battery or an assembled battery formed by combining a plurality of these batteries can be mounted on the vehicle.
- a plug-in hybrid electric vehicle having a long EV mileage or an electric vehicle having a long charge mileage can be formed by mounting such a battery.
- a car a hybrid car, a fuel cell car, an electric car (four-wheeled vehicles (passenger cars, trucks, buses, commercial vehicles, light cars, etc.) This is because it can be used for motorcycles (including motorcycles) and tricycles) to provide a long-life and highly reliable automobile.
- the application is not limited to automobiles.
- it can be applied to various power sources for moving vehicles such as other vehicles, for example, trains, and power sources for mounting such as uninterruptible power supplies. It is also possible to use as.
- Example 1 Preparation of Electrolyte Solution A mixed solvent (30:30:40 (volume ratio)) of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) was used as a solvent. Further, 1.0M LiPF 6 was used as a lithium salt. Further, 2% by mass of vinylene carbonate was added to the total of 100% by mass of the solvent and the lithium salt to prepare an electrolytic solution. Note that “1.0 M LiPF 6 ” means that the lithium salt (LiPF 6 ) concentration in the mixture of the mixed solvent and the lithium salt is 1.0 M.
- a solid content comprising 85% by mass of LiMn 2 O 4 (average particle size: 15 ⁇ m) as a positive electrode active material, 5% by mass of acetylene black as a conductive additive, and 10% by mass of PVdF as a binder was prepared.
- NMP N-methyl-2-pyrrolidone
- the positive electrode slurry is applied to both sides of an aluminum foil (20 ⁇ m) as a current collector, dried and pressed, and the positive electrode active material layer has a coating amount of 18 mg / cm 2 on one side and a thickness of 157 ⁇ m on both sides (including foil).
- a positive electrode was prepared.
- the density of the positive electrode active material layer was 2.95 g / cm 3 .
- Negative Electrode A solid content comprising 95% by mass of artificial graphite (average particle size: 20 ⁇ m) as a negative electrode active material, 2% by mass of acetylene black as a conductive additive, 2% by mass of SBR as a binder, and 1% of CMC was prepared. An appropriate amount of ion-exchanged water, which is a slurry viscosity adjusting solvent, was added to the solid content to prepare a negative electrode slurry.
- the negative electrode slurry was applied to both sides of a copper foil (15 ⁇ m) as a current collector, dried and pressed to prepare a negative electrode having a single-side coating amount of 5.1 mg / cm 2 and a double-sided thickness of 87 ⁇ m (including foil).
- the density of the negative electrode active material layer was 1.48 g / cm 3 .
- Step of Completing Single Cell The positive electrode produced above was cut into a 210 ⁇ 184 mm rectangular shape, and the negative electrode was cut into a 215 ⁇ 188 mm rectangular shape (15 positive electrodes and 16 negative electrodes).
- the positive electrode and the negative electrode were alternately laminated through a 219 ⁇ 191 mm separator (polyolefin microporous membrane, thickness 25 ⁇ m, porosity 55%) to produce a power generation element.
- the rated capacity of the battery thus fabricated was 14.6 Ah, and the ratio of the battery area to the rated capacity was 34.8 cm 2 / Ah.
- the rated capacity of the battery was determined as follows.
- Procedure 1 After reaching 4.1V with constant current charging at 1C, pause for 5 minutes.
- Procedure 2 After Procedure 1, charge for 1.5 hours with constant voltage charging and rest for 5 minutes.
- Procedure 3 After reaching 3.0V by constant current discharge of 1C, discharge by constant voltage discharge for 2 hours, and then rest for 10 seconds.
- Procedure 4 After reaching 4.1 V by constant current charging at 1 C, charge for 2.5 hours by constant voltage charging, and then rest for 10 seconds.
- Procedure 5 After reaching 3.0 V by constant current discharge of 0.5 C, discharge at constant voltage discharge for 2 hours, and then stop for 10 seconds.
- the discharge capacity (CCCV discharge capacity) in the discharge from the constant current discharge to the constant voltage discharge in the procedure 5 is defined as the rated capacity.
- a tab is welded to each of the positive electrode and the negative electrode, and the battery is completed by sealing with an electrolytic solution in an exterior made of an aluminum laminate film, a urethane rubber sheet (thickness 3 mm) larger than the electrode area, and an Al plate (thickness 5 mm). )
- an electrolytic solution in an exterior made of an aluminum laminate film, a urethane rubber sheet (thickness 3 mm) larger than the electrode area, and an Al plate (thickness 5 mm).
- Example 1 Electrolyte volume to be injected into the package body (L), and, according the value of the ratio of the volume V 2 of the excess space in the interior of the exterior body with respect to the V 1 to (V 2 / V 1) in Table 1 below
- a battery was fabricated in the same manner as in Example 1 except that the value was changed to a value and the pressure was applied so that the exterior body group pressure described in Table 1 below was obtained.
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Abstract
Description
負極活物質層は、負極活物質を含む。負極活物質としては、例えば、グラファイト(黒鉛)、ソフトカーボン、ハードカーボン等の炭素材料、リチウム-遷移金属複合酸化物(例えば、Li4Ti5O12)、金属材料、リチウム合金系負極材料などが挙げられる。場合によっては、2種以上の負極活物質が併用されてもよい。好ましくは、容量、出力特性の観点から、炭素材料またはリチウム-遷移金属複合酸化物が、負極活物質として用いられる。なお、上記以外の負極活物質が用いられてもよいことは勿論である。
正極活物質層は活物質を含み、必要に応じて、導電助剤、バインダー、電解質(ポリマーマトリックス、イオン伝導性ポリマー、電解液など)、イオン伝導性を高めるためのリチウム塩などのその他の添加剤をさらに含む。
セパレータは、電解質を保持して正極と負極との間のリチウムイオン伝導性を確保する機能、および正極と負極との間の隔壁としての機能を有する。
集電体を構成する材料に特に制限はないが、好適には金属が用いられる。
集電板(25、27)を構成する材料は、特に制限されず、リチウムイオン二次電池用の集電板として従来用いられている公知の高導電性材料が用いられうる。集電板の構成材料としては、例えば、アルミニウム、銅、チタン、ニッケル、ステンレス鋼(SUS)、これらの合金等の金属材料が好ましい。軽量、耐食性、高導電性の観点から、より好ましくはアルミニウム、銅であり、特に好ましくはアルミニウムである。なお、正極集電板25と負極集電板27とでは、同一の材料が用いられてもよいし、異なる材料が用いられてもよい。
また、図示は省略するが、集電体11と集電板(25、27)との間を正極リードや負極リードを介して電気的に接続してもよい。正極および負極リードの構成材料としては、公知のリチウムイオン二次電池において用いられる材料が同様に採用されうる。なお、外装から取り出された部分は、周辺機器や配線などに接触して漏電したりして製品(例えば、自動車部品、特に電子機器等)に影響を与えないように、耐熱絶縁性の熱収縮チューブなどにより被覆することが好ましい。
電池外装体29は、その内部に発電要素を封入する部材であり、発電要素を覆うことができる、アルミニウムを含むラミネートフィルムを用いた袋状のケースなどが用いられうる。該ラミネートフィルムとしては、例えば、PP、アルミニウム、ナイロンをこの順に積層してなる3層構造のラミネートフィルム等を用いることができるが、これらに何ら制限されるものではない。高出力化や冷却性能に優れ、EV、HEV用の大型機器用電池に好適に利用することができるという観点から、ラミネートフィルムが望ましい。また、外部から掛かる発電要素への群圧を容易に調整することができることから、外装体はアルミニウムを含むラミネートフィルムがより好ましい。
本発明において、発電要素に掛かる群圧は、0.07~0.7kgf/cm2(6.86~68.6kPa)であることが好ましい。群圧を0.07~0.7kgf/cm2となるように発電要素を加圧することで、ガスの系外への排出が向上し、また、電池中の余剰の電解液が電極間にあまり残らないので、セル抵抗の上昇を抑制することができる。さらに、電池の膨らみが抑制されてセル抵抗および長期サイクル後の容量維持率が良好となる。より好適には、発電要素に掛かる群圧が0.1~0.7kgf/cm2(9.80~68.6kPa)である。ここで、群圧とは、発電要素に付加された外力を指し、発電要素にかかる群圧は、フィルム式圧力分布計測システムを用いて容易に測定することができ、本明細書においてはtekscan社製フィルム式圧力分布計測システムを用いて測定する値を採用する。
組電池は、電池を複数個接続して構成した物である。詳しくは少なくとも2つ以上用いて、直列化あるいは並列化あるいはその両方で構成されるものである。直列、並列化することで容量および電圧を自由に調節することが可能になる。
上記電気デバイスは、出力特性に優れ、また長期使用しても放電容量が維持され、サイクル特性が良好である。電気自動車やハイブリッド電気自動車や燃料電池車やハイブリッド燃料電池自動車などの車両用途においては、電気・携帯電子機器用途と比較して、高容量、大型化が求められるとともに、長寿命化が必要となる。したがって、上記電気デバイスは、車両用の電源として、例えば、車両駆動用電源や補助電源に好適に利用することができる。
1.電解液の作製
エチレンカーボネート(EC)、エチルメチルカーボネート(EMC)、ジエチルカーボネート(DEC)の混合溶媒(30:30:40(体積比))を溶媒とした。また1.0MのLiPF6をリチウム塩とした。さらに上記溶媒と上記リチウム塩との合計100質量%に対して2質量%のビニレンカーボネートを添加して電解液を作製した。なお、「1.0MのLiPF6」とは、当該混合溶媒およびリチウム塩の混合物におけるリチウム塩(LiPF6)濃度が1.0Mであるという意味である。
正極活物質としてLiMn2O4(平均粒子径:15μm)85質量%、導電助剤としてアセチレンブラック 5質量%、およびバインダーとしてPVdF 10質量%からなる固形分を用意した。この固形分に対し、スラリー粘度調整溶媒であるN-メチル-2-ピロリドン(NMP)を適量添加して、正極スラリーを作製した。次に、正極スラリーを、集電体であるアルミニウム箔(20μm)の両面に塗布し乾燥・プレスを行い、正極活物質層の片面塗工量18mg/cm2,両面厚み157μm(箔込み)の正極を作成した。また、正極活物質層の密度は、2.95g/cm3とした。
負極活物質として人造黒鉛(平均粒子径:20μm)95質量%、導電助剤としてアセチレンブラック2質量%およびバインダとしてSBR2質量%、CMC1%からなる固形分を用意した。この固形分に対し、スラリー粘度調整溶媒であるイオン交換水を適量添加して、負極スラリーを作製した。次に、負極スラリーを、集電体である銅箔(15μm)の両面に塗布し乾燥・プレスを行い片面塗工量5.1mg/cm2、両面厚み87μm(箔込み)負極を作製した。また、負極活物質層の密度は、1.48g/cm3とした。
上記で作製した正極を210×184mmの長方形状に切断し、負極を215×188mmの長方形状に切断した(正極15枚、負極16枚)。この正極と負極とを219×191mmのセパレータ(ポリオレフィン微多孔膜、厚さ25μm、空隙率55%)を介して交互に積層して発電要素を作製した。このように作製された電池の定格容量は14.6Ahであり、定格容量に対する電池面積の比は34.8cm2/Ahであった。ここで、電池の定格容量は、以下により求めた。
定格容量は、試験用電池について、電解液を注入した後で、10時間程度放置し、電池電圧が2.0V以上になってから初期充電を行う。その後、温度25℃、3.0Vから4.1Vの電圧範囲で、次の手順1~5によって測定される。
外装体の内部に注入する電解液量(L)、および、上記V1に対する外装体の内部における余剰空間の体積V2の比の値(V2/V1)を下記の表1に記載の値に変更したこと、並びに、下記の表1に記載の外装体群圧となるように加圧したこと以外は、実施例1と同様にして電池を作製した。
1.単電池の初回充電工程
上記のようにして作製した非水電解質二次電池(単電池)を充放電性能試験により評価した。この充放電性能試験は、25℃に保持した恒温槽において24時間保持し、初回充電を実施した。初回充電は、0.05CAの電流値で4.2Vまで定電流充電(CC)し、その後定電圧(CV)で、あわせて25時間充電した。その後、40℃に保持した恒温槽において96時間保持した。その後、25℃に保持した恒温槽において、1Cの電流レートで2.5Vまで放電を行い、その後に10分間の休止時間を設けた。
続いて、45℃に保持した恒温槽において、電池温度を45℃とした後、性能試験を行った。充電は1Cの電流レートで4.2Vまで定電流充電(CC)し、その後定電圧(CV)で、あわせて2.5時間充電した。その後、10分間休止時間を設けた後、1Cの電流レートで2.5Vまで放電を行い、その後に10分間の休止時間を設けた。これらを1サイクルとして充放電試験を実施した。初回の放電容量に対して300サイクル後に放電した割合を容量維持率とした。結果を下記の表1に示す。なお、表1に示す容量維持率の値は、比較例1の容量維持率の値を100としたときの相対値である。
2 加圧部材、
3 固定部材、
4 電極タブ、
10 リチウムイオン二次電池、
11 正極集電体、
12 負極集電体、
13 正極活物質層、
15 負極活物質層、
17 セパレータ、
17’ セパレータの端部、
17a 樹脂多孔質基体、
17b セラミック層(耐熱絶縁層)、
19 単電池層、
21 発電要素、
25 正極集電板、
27 負極集電板、
29 電池外装材、
31 電池外装体の内部における余剰空間。
Claims (13)
- 発電要素が外装体の内部に封入されてなる非水電解質二次電池であって、
前記発電要素が、
正極集電体の表面に正極活物質層が形成されてなる正極と、
負極集電体の表面に水系バインダーを含む負極活物質層が形成されてなる負極と、
電解液を保持するセパレータと、
前記発電要素の内部で発生したガスを前記外装体の内部における余剰空間へと放出させるガス放出手段と、
を有し、前記発電要素の有する空孔の体積V1に対する前記余剰空間の体積V2の比の値(V2/V1)が0.5~1.0である、非水電解質二次電池。 - 前記セパレータが、無機粒子およびバインダーを含むセラミック層が樹脂多孔質基体の少なくとも一方の面に積層されてなるものであり、
前記ガス放出手段は前記セラミック層である、請求項1に記載の非水電解質二次電池。 - 前記外装体に注入された前記電解液の体積Lの前記外装体の内部における余剰空間の体積V2に対する比の値(L/V2)が0.4~0.7である、請求項1または2に記載の非水電解質二次電池。
- 前記外装体の内部における余剰空間が前記発電要素の鉛直上方に少なくとも配置されてなる、請求項1~3のいずれか1項に記載の非水電解質二次電池。
- 前記負極活物質層が長方形状であり、前記長方形の短辺に平行な前記発電要素の積層方向の断面における空孔断面積が、前記長方形の長辺に平行な前記発電要素の積層方向の断面における空孔断面積よりも大きい、請求項1~4のいずれか1項に記載の非水電解質二次電池。
- 前記負極活物質層が長方形状であり、前記長方形の短辺の長さが100mm以上である、請求項1~5のいずれか1項に記載の非水電解質二次電池。
- 定格容量に対する電池面積(電池外装体まで含めた電池の投影面積)の比の値が5cm2/Ah以上であり、かつ、定格容量が3Ah以上である、請求項1~6のいずれか1項に記載の非水電解質二次電池。
- 矩形状の正極活物質層の縦横比として定義される電極のアスペクト比が1~3である、請求項1~7のいずれか1項に記載の非水電解質二次電池。
- 前記セパレータの空孔率が40~65%である、請求項1~8のいずれか1項に記載の非水電解質二次電池。
- 前記負極活物質層の密度が1.4~1.6g/cm3である、請求項1~9のいずれか1項に記載の非水電解質二次電池。
- 前記発電要素に掛かる群圧が0.07~0.7kgf/cm2となるように外装体に圧力を付加させる加圧部材をさらに有する、請求項1~10のいずれか1項に記載の非水電解質二次電池。
- 前記水系バインダーは、スチレン-ブタジエンゴム、アクリロニトリル-ブタジエンゴム、メタクリル酸メチル-ブタジエンゴム、およびメタクリル酸メチルゴムからなる群から選択される少なくとも1つのゴム系バインダーを含む、請求項1~11のいずれか1項に記載の非水電解質二次電池。
- 前記水系バインダーは、スチレン-ブタジエンゴムを含む、請求項12に記載の非水電解質二次電池。
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US9899649B2 (en) | 2018-02-20 |
JPWO2014157423A1 (ja) | 2017-02-16 |
EP2980910A1 (en) | 2016-02-03 |
EP2980910A4 (en) | 2016-09-28 |
CN105074997A (zh) | 2015-11-18 |
US20160149178A1 (en) | 2016-05-26 |
JP6242860B2 (ja) | 2017-12-06 |
CN105074997B (zh) | 2018-01-02 |
KR20150123306A (ko) | 2015-11-03 |
EP2980910B1 (en) | 2018-02-28 |
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