WO2012164642A1 - バイポーラ全固体電池 - Google Patents
バイポーラ全固体電池 Download PDFInfo
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- WO2012164642A1 WO2012164642A1 PCT/JP2011/062205 JP2011062205W WO2012164642A1 WO 2012164642 A1 WO2012164642 A1 WO 2012164642A1 JP 2011062205 W JP2011062205 W JP 2011062205W WO 2012164642 A1 WO2012164642 A1 WO 2012164642A1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
- H01M10/0418—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes with bipolar electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0561—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of inorganic materials only
- H01M10/0562—Solid materials
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/12—Construction or manufacture
- H01M10/126—Small-sized flat cells or batteries for portable equipment
- H01M10/127—Small-sized flat cells or batteries for portable equipment with bipolar electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/06—Lead-acid accumulators
- H01M10/18—Lead-acid accumulators with bipolar electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/24—Alkaline accumulators
- H01M10/28—Construction or manufacture
- H01M10/281—Large cells or batteries with stacks of plate-like electrodes
- H01M10/282—Large cells or batteries with stacks of plate-like electrodes with bipolar electrodes
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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
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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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
- 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 bipolar all solid state battery capable of suitably preventing a short circuit caused by a breakage of a current collector of a bipolar electrode, and a method for manufacturing the same.
- lithium batteries currently on the market use an electrolyte containing a flammable organic solvent, it is possible to install safety devices that suppress the temperature rise during short circuits and to improve the structure and materials to prevent short circuits. Necessary.
- a lithium battery in which the electrolyte is changed to a solid electrolyte layer to make the battery completely solid does not use a flammable organic solvent in the battery, so the safety device can be simplified, and manufacturing costs and productivity can be reduced. It is considered excellent.
- bipolar battery for electric vehicles, attention is focused on a laminated bipolar battery that can achieve high energy density and high output density.
- a bipolar electrode in which a positive electrode active material layer is formed on one surface of a current collector and a negative electrode active material layer is formed on the other surface, and an electrolyte are alternately stacked.
- Patent Document 1 discloses that an insulating portion made of an insulating material is provided on a current collector around a bipolar electrode where an electrode active material layer is not formed.
- the present invention has been made in view of the above problems, and it is possible to prevent the current collector of the bipolar electrode from being broken and to suitably prevent the occurrence of a short circuit, and the above bipolar all solid state.
- the main object is to provide a battery manufacturing method.
- a current collector a positive electrode active material layer containing a positive electrode active material formed on one surface of the current collector, and the other surface of the current collector are provided.
- a bipolar electrode having an electrode active material layer formed of a negative electrode active material layer containing a negative electrode active material and a solid electrolyte layer containing a solid electrolyte, wherein the plurality of bipolar electrodes are interposed via the solid electrolyte layer
- the electrode active material layer is formed inside an end of the current collector, and between the end of the electrode active material layer and the current collector surface.
- a bipolar all solid state battery is provided in which a reinforcing layer formed on the surface of the current collector is disposed.
- the reinforcing layer can be disposed between the end of the electrode active material layer and the current collector surface, the current collector near the end of the electrode active material layer can be reinforced. It becomes. Therefore, it becomes possible to provide the current collector with durability against the above-described shearing shear force, and it is possible to suitably prevent the occurrence of a short circuit due to the current collector being broken. Therefore, a bipolar all solid state battery that is less likely to cause a short circuit due to breakage of the current collector can be obtained.
- the reinforcing layer is preferably an insulator. It is possible to suitably prevent the occurrence of a short circuit in the portion where the reinforcing layer is formed.
- the end of the current collector is covered with an insulator.
- a bipolar all solid state battery in which a short circuit due to contact between current collectors adjacent in the stacking direction is unlikely to occur can be obtained.
- the bipolar all solid state battery manufacturing method described above the end of the electrode active material layer forming region is formed on the inner side of the end of the current collector, the electrode active material layer forming region, Forming the reinforcing layer on the surface of the current collector so that the reinforcing layer is disposed between the surface of the current collector and then forming the electrode active material layer in the electrode active material layer forming region;
- a bipolar electrode forming step for forming a bipolar electrode by the step, a solid electrolyte layer forming step for forming a solid electrolyte layer, and an assembly step for assembling a bipolar all solid state battery by laminating a plurality of the bipolar electrodes via the solid electrolyte layer A method for producing a bipolar all solid state battery is provided.
- the reinforcing layer can be disposed between the end portion of the electrode active material layer and the current collector surface by having the bipolar electrode forming step, the vicinity of the end portion of the electrode active material layer can be provided.
- the current collector can be reinforced, and the current collector can be provided with durability against the above-described shear shear force. Therefore, it is possible to manufacture a bipolar all solid state battery that is less likely to cause a short circuit due to breakage of the current collector.
- the bipolar all solid state battery of the present invention includes a current collector, a positive electrode active material layer containing a positive electrode active material formed on one surface of the current collector, and a negative electrode active material formed on the other surface of the current collector.
- a bipolar electrode having an electrode active material layer made of a negative electrode active material layer containing a substance and a solid electrolyte layer containing a solid electrolyte, and a plurality of the bipolar electrodes are laminated via the solid electrolyte layer
- the electrode active material layer is formed inside an end portion of the current collector, and between the end portion of the electrode active material layer and the current collector surface, on the current collector surface.
- the formed reinforcing layer is arranged.
- a plurality of bipolar electrodes are laminated via a solid electrolyte layer
- a positive electrode active material layer of one bipolar electrode and a negative electrode active material layer of another bipolar electrode adjacent to the one bipolar electrode It means that a plurality of bipolar electrodes are laminated so that a solid electrolyte layer is disposed between them.
- the reinforcing layer is disposed between the end of the electrode active material layer and the current collector surface means that the end of the positive electrode active material layer or the end of the negative electrode active material layer This means that a reinforcing layer is disposed between the end of at least one electrode active material layer and the current collector surface. In this case, it means that a reinforcing layer is formed on at least one current collector surface.
- FIG. 1 is a schematic sectional view showing an example of a bipolar all solid state battery of the present invention.
- a bipolar all solid state battery 100 of the present invention includes a current collector 11, a positive electrode active material layer 12 formed on one surface of the current collector 11 and containing a positive electrode active material, and a current collector.
- a bipolar electrode 10 having a negative electrode active material layer 13 formed on the other surface of the electrode 11 and comprising a negative electrode active material layer 13 containing a negative electrode active material, a reinforcing layer 14 formed on the surface of the current collector 11, and a solid electrolyte.
- the bipolar all solid state battery 100 of the present invention may have a battery case 30 and a restraining jig 40 in addition to the above-described configuration.
- FIG. 2 (a) is a schematic plan view showing an example of a bipolar electrode used in the bipolar all solid state battery of the present invention
- FIG. 2 (b) is a cross-sectional view taken along line AA of FIG. 2 (a).
- . 2A is a view of the bipolar electrode 10 as viewed from the negative electrode active material layer 13 side, and the current collector 11 and the positive electrode active material layer 12 are not shown. As shown in FIGS.
- the positive electrode active material layer 12 is formed inside the end s of the current collector 11, and the positive electrode A reinforcing layer 14 is disposed between the end p of the active material layer 12 and the surface of the current collector 11, and the reinforcing layer 14 continues from the end s of the current collector 11 to the end p of the positive electrode active material layer 12. Is formed.
- the negative electrode active material layer 13 is formed inside the end s of the current collector 11, and the end q of the negative electrode active material layer 13 and the surface of the current collector 11 are formed.
- a reinforcing layer 14 is disposed therebetween, and the reinforcing layer 14 is continuously formed from the end s of the current collector 11 to the end q of the negative electrode active material layer 13.
- r in FIG.2 (b) has shown the edge part by the side of the electrode active material layer of the reinforcement layer 14.
- FIG. Moreover, the dashed-dotted line in Fig.2 (a) has shown the edge part r (negative electrode active material layer 13 side) of the reinforcement layer 14.
- the reinforcing layer can be disposed between the end of the electrode active material layer and the current collector surface, the current collector near the end of the electrode active material layer can be reinforced. It becomes. Therefore, it becomes possible to provide the current collector with durability against the above-described shearing shear force, and it is possible to suitably prevent the occurrence of a short circuit due to the current collector being broken. Therefore, a bipolar all solid state battery that is less likely to cause a short circuit due to breakage of the current collector can be obtained.
- the reinforcing layer is formed on the surface of the current collector and does not completely seal the outer periphery of the bipolar all solid state battery, even when gas is generated from the solid electrolyte layer, the bipolar layer It becomes possible to discharge out of the all solid state battery, and it is possible to suitably prevent the deterioration of the electrode active material layer.
- Bipolar electrode used in the present invention has a current collector, a positive electrode active material layer, a negative electrode active material layer, and a reinforcing layer.
- the reinforcing layer used in the present invention is formed on the surface of the current collector, and is disposed between the end of the electrode active material layer and the current collector surface.
- Such a reinforcing layer is only required to be able to reinforce the current collector, and may be an insulator or a conductor, but an insulator is more preferable. This is because when the reinforcing layer is an insulator, it is possible to suitably prevent occurrence of a short circuit in the portion where the reinforcing layer is formed.
- the position where such a reinforcing layer is formed is not particularly limited as long as the current collector can be reinforced.
- the surface of the current collector on the positive electrode active material layer side or the surface of the current collector on the negative electrode active material layer side Or may be formed on both the positive electrode active material layer side surface and the negative electrode active material layer side surface of the current collector.
- the reinforcing layer is preferably formed on both the positive electrode active material layer side surface and the negative electrode active material layer side surface of the current collector. This is because the durability of the current collector against the above-described shearing shear force can be made higher.
- the region where the reinforcing layer is formed on the surface of the current collector is not particularly limited as long as the reinforcing layer can be disposed between the end of the electrode active material layer and the current collector surface. Since the formation region of the reinforcing layer is formed in consideration of the area contributing to power generation (power generation area) in the bipolar electrode, it is usually formed in the region described below, for example, in the central portion of the bipolar electrode. Is not.
- the reinforcing layer Since the reinforcing layer is disposed between the end of the electrode active material layer and the current collector surface, it is usually formed inside the electrode active material layer forming region where the electrode active material layer is formed. It is what has been. As the width of the reinforcing layer formed inside the electrode active material layer forming region, that is, the laminated portion of the electrode active material layer and the reinforcing layer, it is possible to give the current collector durability against the above-described shear shear force. It is not particularly limited as long as it is about a certain level, and can be appropriately selected depending on the use of the bipolar all solid state battery of the present invention.
- the ratio of the width of the laminated portion of the electrode active material layer and the reinforcing layer to the width of the electrode active material layer is in the range of 0.01% to 30%, in particular, 0.1% to 10%. Preferably, it is in the range of 1% to 5%. This is because when the ratio is less than the above range, the manufacturing process may be complicated because high accuracy is required for alignment of the electrode active material layer and the reinforcing layer. On the other hand, when the ratio exceeds the above range, the power generation area in the bipolar electrode is reduced, and the battery characteristics of the bipolar all solid state battery of the present invention may be deteriorated.
- the width of the laminated portion of the electrode active material layer and the reinforcing layer refers to the distances indicated by L1 and L1 'in FIGS. 2 (a) and 2 (b).
- the width of the electrode active material layer refers to the distance from one end side of the electrode active material layer to the other end side facing the one end side.
- L2 , L2 ′ In FIGS. 2A and 2B, L2 , L2 ′.
- the reinforcing layer is formed continuously from the end of the current collector
- the end s of the current collector 11 and the reinforcing layer 14 are formed as shown in FIG. 3 (b), not only when the reinforcing layer 14 is continuously formed on the surface of the current collector 11 so as to coincide with the end r ′ of the current collector (the end side of the current collector).
- the bipolar all solid state battery of the present invention is more than the end portion s of the end portion 11 of the current collector to the extent that it is possible to prevent a short circuit due to contact between the current collectors adjacent in the stacking direction.
- FIG. 14 is a concept including a case where 14 is continuously formed so as to cover the end s and the end face of the current collector 11.
- the reinforcing layer 14 is continuously formed so as to cover the end portion s and the end surface of the current collector 11. This is because it is possible to more suitably prevent the short circuit due to the contact between the adjacent current collectors described above.
- FIGS. 3A and 3B are schematic cross-sectional views showing other examples of the bipolar electrode used in the present invention, and the reference numerals not described are the same as those in FIG. 2B.
- the reinforcing layer may also be formed inside the end portion of the electrode active material layer, so that “the reinforcing layer is continuously formed up to the end portion of the electrode active material layer.
- the term “has” is a concept including the case where the reinforcing layer is continuously formed to the end of the electrode active material layer and the inside thereof.
- the reinforcing layer is formed continuously from the end of the current collector to the end of the electrode active material layer, and the positive electrode active material layer side surface of the current collector or the negative electrode active of the current collector When formed on either one of the material layer side surfaces, in the bipolar all solid state battery of the present invention, in the two bipolar electrodes adjacent to each other in the stacking direction, the current collector surface of each of the opposing bipolar electrodes It is preferable that a reinforcing layer is formed on either side. It is because it becomes possible to prevent the short circuit by the contact of the collectors adjacent in the lamination direction more suitably.
- the material of the reinforcing layer is not particularly limited as long as desired durability can be imparted to the current collector.
- the material of the reinforcing layer is preferably an insulator in the present invention
- the material of the reinforcing layer is preferably an insulating material.
- the insulating material is not particularly limited as long as it has a desired insulating property, and can be the same as the material of the reinforcing layer used in a general bipolar battery. It is preferable that Since the resin material has a high durability against the above-mentioned shearing force and has a property of extending, for example, even when the current collector is torn in the region where the reinforcing layer is formed, the reinforcing layer extends. Thus, it is possible to suitably prevent a through-hole from occurring in the current collector and causing a short circuit.
- the reinforcing layer may have an adhesive layer on the surface on the current collector side. This is because the adhesion between the reinforcing layer and the current collector can be improved.
- the material used for an adhesion layer since it can be set as a general adhesive, description here is abbreviate
- stacked the reinforcement layer and the adhesion layer is a grade used as the thickness of the reinforcement layer mentioned above.
- the method for forming the reinforcing layer is not particularly limited as long as it can form a reinforcing layer having a desired thickness in a desired region on the surface of the current collector.
- the above-described resin material is applied.
- the method of forming by doing this, the method of bonding the film using the resin material mentioned above on the surface of an electrical power collector using an adhesion layer, etc. can be mentioned.
- Electrode active material layer The electrode active material layer in the present invention is formed on one surface of the current collector and formed on the other surface of the current collector and the positive electrode active material layer containing the positive electrode active material. It consists of a negative electrode active material layer containing a negative electrode active material.
- Positive electrode active material layer used in the present invention is formed on one surface of a current collector and contains a positive electrode active material.
- the positive electrode active material layer forming region for forming the positive electrode active material layer is inside the end of the current collector, the bipolar electrode has a desired power generation area, and inside the end of the positive electrode active material layer.
- the region is not particularly limited as long as it can form a reinforcing layer.
- the positive electrode active material layer forming region is appropriately selected according to the application of the bipolar all solid state battery of the present invention.
- the positive electrode active material layer is a layer containing at least a positive electrode active material, and may contain at least one of a conductive material, a solid electrolyte material, and a binder as necessary.
- a positive electrode active material for example, in the case of a bipolar all solid lithium battery, LiCoO 2 , LiMnO 2 , Li 2 NiMn 3 O 8 , LiVO 2 , LiCrO 2 , LiFePO 4 , LiCoPO 4 , LiNiO 2 , LiNi 1/3 Co 1/3 Mn 1/3 O 2 and the like.
- the positive electrode active material layer in the present invention may further contain a conductive material. By adding a conductive material, the conductivity of the positive electrode active material layer can be improved. Examples of the conductive material include acetylene black, ketjen black, and carbon fiber.
- the positive electrode active material layer may further contain a solid electrolyte material. By adding the solid electrolyte material, the ion conductivity of the positive electrode active material layer can be improved.
- the solid electrolyte material can be the same as the material described in the section of the solid electrolyte layer described later.
- the positive electrode active material layer may further contain a binder. Examples of the binder include a fluorine-containing binder such as polytetrafluoroethylene (PTFE).
- the thickness of the positive electrode active material layer is preferably in the range of 0.1 ⁇ m to 1000 ⁇ m, for example.
- the method for forming the positive electrode active material layer is not particularly limited as long as it is a method capable of forming a positive electrode active material layer having a desired thickness in a desired region on the surface of the current collector. Examples include a method of forming by pressing the material of the layer under pressure, and a method of forming by preparing a slurry containing the material of the positive electrode active material layer and a solvent, and applying the slurry to the surface of the current collector. it can.
- Negative electrode active material layer used in the present invention is formed on the surface of the current collector opposite to the positive electrode active material layer side, and contains a negative electrode active material. is there.
- the negative electrode active material layer forming region for forming the negative electrode active material layer is inside the end of the current collector, the bipolar electrode has a desired power generation area, and is inside the end of the negative electrode active material layer.
- the region is not particularly limited as long as it can form a reinforcing layer.
- the negative electrode active material layer forming region is appropriately selected according to the use of the bipolar all solid state battery of the present invention.
- the negative electrode active material layer in the present invention is a layer containing at least a negative electrode active material, and may contain at least one of a conductive material, a solid electrolyte material, and a binder as necessary.
- the negative electrode active material include a metal active material and a carbon active material.
- the metal active material include In, Al, Si, and Sn.
- examples of the carbon active material include mesocarbon microbeads (MCMB), highly oriented graphite (HOPG), hard carbon, and soft carbon.
- the conductive material, the solid electrolyte material, and the binder used for the negative electrode active material layer are the same as those in the positive electrode active material layer described above.
- the thickness of the negative electrode active material layer is preferably in the range of 0.1 ⁇ m to 1000 ⁇ m, for example.
- the method for forming the negative electrode active material layer can be the same as the method for forming the positive electrode active material layer described above, description thereof is omitted here.
- the current collector in the present invention will be described.
- the material of the current collector in the present invention is not particularly limited as long as it has conductivity and can form a positive electrode active material layer, a negative electrode active material layer, and a reinforcing layer on the current collector surface.
- stainless steel, aluminum, copper, etc. can be mentioned.
- the thickness of the current collector can be appropriately selected according to the application of the bipolar all solid state battery of the present invention, but is usually preferably in the range of 1 ⁇ m to 100 ⁇ m, It is preferably in the range of 5 ⁇ m to 30 ⁇ m, particularly in the range of 10 ⁇ m to 20 ⁇ m. Moreover, it is preferable that the thickness of the current collector is thinner within the above-described range. This is because the effect of preventing the occurrence of a short circuit due to the breakage of the current collector can be exhibited more greatly.
- the shape of the current collector can be appropriately selected according to the use of the bipolar all solid state battery of the present invention.
- an electrode active material layer and a reinforcing layer are usually provided on the outer surface (T surface in FIG. 1) of the bipolar electrode located in the outermost layer of the bipolar all solid state battery. Is not formed.
- the end of the current collector is covered with an insulator.
- the insulator may be a coating of an insulating material formed separately from the reinforcing layer, and is formed continuously from the end of the current collector to the end of the electrode active material layer.
- it may be a reinforcing layer, it is more preferably a reinforcing layer. This is because the manufacturing process can be simplified as compared with the case where the coating of the insulating material is separately formed.
- Solid electrolyte layer The solid electrolyte layer used in the present invention has a solid electrolyte.
- the solid electrolyte layer is disposed between a positive electrode active material layer of one bipolar electrode and a negative electrode active material layer of another bipolar electrode adjacent to the one bipolar electrode. It is.
- the formation region of such a solid electrolyte layer is not particularly limited as long as it can be disposed between the positive electrode active material layer and the negative electrode active material layer, and as shown in FIG. 20 is preferably formed so as to cover the surface and the end face of the electrode active material layer (negative electrode active material layer 13 in FIG. 1). It is because it becomes possible to prevent the short circuit of a bipolar all-solid-state battery more suitably.
- the solid electrolyte material constituting the solid electrolyte layer is not particularly limited as long as it has ion conductivity.
- the bipolar all solid battery of the present invention is a bipolar all solid lithium battery, Li 2 O—B 2 O 3 —P 2 O 5 , Li 2 O—SiO 2 , Li 2 O—B 2 O 3 , Li 2 O—B 2 O 3 —ZnO, and other oxide amorphous solid electrolytes Materials: Li 2 S—SiS 2 , LiI—Li 2 S—SiS 2 , LiI—Li 2 S—P 2 S 5 , LiI—Li 2 S—B 2 S 3 , Li 3 PO 4 —Li 2 S—Si 2 S, Li 3 PO 4 —Li 2 S—SiS 2 , Li 3 PO 4 —Li 2 S—SiS, LiI—Li 2 S—P 2 O 5 , LiI—Li 3 PO 4 —P 2 S 5 , Li 2 S-P
- the solid electrolyte layer may contain a binder in addition
- the thickness of the solid electrolyte layer is, for example, preferably in the range of 0.1 ⁇ m to 1000 ⁇ m, and more preferably in the range of 0.1 ⁇ m to 300 ⁇ m.
- the method for forming the solid electrolyte layer is not particularly limited.
- a method for forming the solid electrolyte layer by press-pressing the material of the solid electrolyte layer, a slurry containing the material for the solid electrolyte layer and a solvent, and the above slurry are prepared.
- the bipolar all solid state battery of the present invention has at least the bipolar electrode described above and a solid electrolyte layer. Usually, a battery case is used.
- a battery case used in the present invention a general battery case of a bipolar all solid state battery can be used, and examples thereof include a battery case made of SUS.
- Bipolar all-solid-state battery The bipolar all-solid-state battery of the present invention is obtained by laminating a plurality of bipolar electrodes via the solid electrolyte layer described above. The number of stacked bipolar electrodes is appropriately selected according to the application of the bipolar all solid state battery of the present invention.
- Examples of the bipolar all solid state battery of the present invention include an all solid lithium battery, an all solid sodium battery, an all solid magnesium battery, an all solid calcium battery, and the like. Batteries and all solid sodium batteries are preferred, and all solid lithium batteries are particularly preferred. Further, the all solid state battery of the present invention may be a primary battery or a secondary battery, but among them, a secondary battery is preferable. This is because it can be repeatedly charged and discharged and is useful, for example, as a vehicle-mounted battery. Examples of the shape of the all solid state battery of the present invention include a coin type, a laminate type, a cylindrical type, and a square type.
- the method for producing a bipolar all solid state battery of the present invention is not particularly limited, and for example, the method described in the section “B. Production method for bipolar all solid state battery” described later can be used.
- the manufacturing method of the bipolar all solid state battery of the present invention is the manufacturing method of the bipolar all solid state battery described in the above-mentioned section “A. Bipolar all solid state battery”, and is located inside the end portion of the current collector.
- FIG. 4A to 4D are process diagrams showing an example of a method for manufacturing a bipolar all solid state battery of the present invention.
- the bipolar all solid state battery manufacturing method of the present invention first, in the bipolar electrode forming step, as shown in FIG. 4A, on one surface of the current collector 11, inside the end of the current collector 11.
- the reinforcing layer 14 is disposed between the position and the positive electrode active end of the positive electrode active material layer forming region X 12 where material layer is formed and the current collector 11 surface from the end of the current collector 11 the reinforcing layer 14 to the end portion of the positive electrode active material layer forming region X 12 are continuously formed in the current collector 11 on the surface.
- the reinforcing layer 14 is disposed between the end of the negative electrode active material layer forming region X 13 where the negative electrode active material layer is formed and the surface of the current collector 11. as such, continuously formed reinforcing layer 14 on the current collector 11 on the surface from the end of the current collector 11 to the end portion of the negative electrode active material layer forming region X 13.
- the positive electrode active material layer 12 and the negative electrode active material layer 13 are formed in the positive electrode active material layer forming region X 12 and the negative electrode active material layer X 13 to thereby form the bipolar electrode 10.
- the solid electrolyte layer forming step as shown in FIG. 4C, the solid electrolyte layer 20 is formed so as to cover the negative electrode active material layer 13.
- the bipolar all solid state battery 100 is assembled by laminating a plurality of bipolar electrodes 10 via the solid electrolyte layer 20.
- the bipolar all solid state battery shown in FIG. 1 can be obtained by enclosing the assembled bipolar all solid state battery in a battery case and disposing a restraining jig.
- the reinforcing layer can be disposed between the end portion of the electrode active material layer and the current collector surface by having the bipolar electrode forming step, the vicinity of the end portion of the electrode active material layer can be provided.
- the current collector can be reinforced, and the current collector can be provided with durability against the above-described shear shear force. Therefore, it is possible to manufacture a bipolar all solid state battery that is less likely to cause a short circuit due to breakage of the current collector.
- Bipolar electrode forming step in the present invention includes an end portion of an electrode active material layer forming region where an electrode active material layer is formed inside the end portion of the current collector, and the current collector surface.
- step of forming a bipolar electrode by forming the electrode active material layer in the electrode active material layer forming region after forming the reinforcement layer on the current collector surface so that the reinforcement layer is disposed therebetween. is there.
- this step includes forming a reinforcing layer on the current collector surface, and then forming a positive electrode active material layer on each surface of the current collector or It may be a step of forming a negative electrode active material layer, and after forming a reinforcing layer on one surface of the current collector, a positive electrode active material layer or a negative electrode active material layer on the surface of the current collector on which the reinforcing layer is formed After forming one of these, and further forming a reinforcing layer on the other surface of the current collector, a step in which the positive electrode active material layer or the negative electrode active material layer is not formed may be formed.
- the reinforcing layer is continuously formed from the end of the current collector to the end of the electrode active material layer. Since the current collector located outside the edge of the electrode active material layer can be covered with the reinforcing layer, and the exposed portion of the current collector can be reduced or eliminated, the current collector adjacent to the stacking direction can be removed. This is because it is possible to manufacture a bipolar all solid state battery that is less likely to cause a short circuit due to contact between electric bodies.
- the formation position of the reinforcing layer, the forming region of the reinforcing layer, the forming reinforcing layer and the forming method thereof, the electrode active material layer and the forming method thereof, and the bipolar electrode in this step are described in “A. Since it may be the same as that described in the section of “Solid Battery”, description thereof is omitted here.
- Solid electrolyte layer forming step is a step of forming a solid electrolyte layer.
- the solid electrolyte layer formed by this step and the method for forming the solid electrolyte layer can be the same as those described in the above-mentioned section “A. Bipolar all-solid battery”, and thus the description thereof is omitted here.
- the assembling process in the present invention is an assembling process for assembling a bipolar all solid state battery by laminating a plurality of the bipolar electrodes through the solid electrolyte layer.
- the assembly method of the bipolar all solid state battery used in this step is not particularly limited as long as it is a method capable of laminating the plurality of bipolar electrodes through the solid electrolyte layer, and may be a known method. it can.
- the bipolar all solid state battery obtained in this step can be the same as the contents described in the above-mentioned section “A. Bipolar all solid state battery”, and therefore the description thereof is omitted here.
- the method for producing a bipolar all solid state battery of the present invention can be performed by appropriately selecting necessary steps in addition to the steps described above. Examples of such a process include a process of enclosing a bipolar all solid state battery in a battery case, a process of arranging a restraining jig, and the like.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.
- a SUS304 foil having a thickness of 10 ⁇ m was prepared as a current collector, and a PEN film having a thickness of 12 ⁇ m was thermocompression bonded to the outer periphery of the SUS304 foil as a reinforcing layer.
- the reinforcing layer was thermocompression bonded to both surfaces of the current collector.
- LiNi 1/3 Co 1/3 Mn 1/3 O 2 positive electrode active material
- 75Li 2 S-25P 2 S 5 solid electrolyte
- butylene rubber manufactured by JSR
- heptane solvent
- the reinforcing layer is a positive electrode active material
- a positive electrode active material layer having a thickness of 60 ⁇ m was obtained by coating on a current collector and drying so as to be formed inside the end of the layer.
- Natural graphite negative electrode active material
- 75Li 2 S-25P 2 S 5 solid electrolyte
- butylene rubber manufactured by JSR
- heptane solvent
- the mixture is mixed and kneaded to form a slurry, so that the reinforcing layer is formed inside the end portion of the positive electrode active material layer.
- the negative electrode active material layer having a thickness of 80 ⁇ m was obtained by applying and drying on the current collector on the side opposite to the side where the positive electrode active material layer is formed.
- bipolar electrodes As described above, four bipolar electrodes are prepared, and the solid electrolyte layer is disposed between the positive electrode active material layer of one bipolar electrode and the negative electrode layer of the bipolar electrode adjacent to the one bipolar electrode. Bipolar electrodes were stacked. The outer surface of the bipolar electrode disposed in the outermost layer is not formed with a reinforcing layer, an electrode active material layer, or a solid electrolyte layer.
- the obtained bipolar all solid state battery was put in an aluminum laminate film and sealed. Further, the laminate film was fastened by a restraining jig having a structure capable of applying a load. Thereby, a bipolar all solid state battery was obtained.
- the occurrence rate of current collector breakage could be reduced by adopting the above-mentioned structure of the bipolar all solid state battery.
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Abstract
Description
まず、本発明のバイポーラ全固体電池について説明する。本発明のバイポーラ全固体電池は、集電体、並びに上記集電体の一方の表面に形成され正極活物質を含有する正極活物質層、および上記集電体の他方の表面に形成され負極活物質を含有する負極活物質層からなる電極活物質層を有するバイポーラ電極と、固体電解質を含有する固体電解質層とを有し、上記固体電解質層を介して複数の上記バイポーラ電極が積層されているものであって、上記電極活物質層は上記集電体の端部の内側に形成され、上記電極活物質層の端部と上記集電体表面との間には上記集電体表面上に形成された補強層が配置されていることを特徴とするものである。
また、本発明において「電極活物質層の端部と集電体表面との間に補強層が配置されている」とは、正極活物質層の端部または負極活物質層の端部のうち、少なくとも一方の電極活物質層の端部と集電体表面との間に補強層が配置されていることを指す。また、この場合、少なくとも一方の集電体表面に補強層が形成されていることを指す。
また、図2(a)は本発明のバイポーラ全固体電池に用いられるバイポーラ電極の一例を示す概略平面図であり、図2(b)は図2(a)のA-A線断面図である。なお、図2(a)は、バイポーラ電極10を負極活物質層13側からみた図であり、集電体11および正極活物質層12については省略して示している。図2(a)、(b)に示すように、本発明において、集電体11の一方の表面においては、正極活物質層12が集電体11の端部sの内側に形成され、正極活物質層12の端部pと集電体11表面との間には補強層14が配置され、補強層14が集電体11の端部sから正極活物質層12の端部pまで連続して形成されている。また、集電体11の他方の表面においては、負極活物質層13が集電体11の端部sの内側に形成され、負極活物質層13の端部qと集電体11表面との間には補強層14が配置され、補強層14が集電体11の端部sから負極活物質層13の端部qまで連続して形成されている。なお、図2(b)中のrは補強層14の電極活物質層側の端部を示している。また、図2(a)中の一点鎖線は補強層14の端部r(負極活物質層13側)を示している。
本発明に用いられるバイポーラ電極は、集電体と、正極活物質層と、負極活物質層と、補強層とを有するものである。
本発明に用いられる補強層は、集電体の表面に形成され、電極活物質層の端部と集電体表面との間に配置されるものである。
なお、本発明において「補強層が集電体の端部から電極活物質層の端部まで連続して形成されている」とは、補強層が集電体の端部から正極活物質層の端部または負極活物質層の端部まで連続して形成されていることを指す。
また上述したように、本発明においては補強層が電極活物質層の端部の内側にも形成される場合があることから、「補強層が電極活物質層の端部まで連続して形成されている」とは、補強層が電極活物質層の端部およびその内側まで連続して形成されている場合を含む概念である。
上記絶縁性材料としては、所望の絶縁性を有するものであれば特に限定されず、一般的なバイポーラ電池に用いられる補強層の材料と同様とすることが可能であるが、なかでも、樹脂材料であることが好ましい。樹脂材料は上述の剪断力に対する耐久性が高く、伸びるといった性質を有することから、例えば補強層が形成されている領域において集電体に破れが生じた場合であっても、補強層が伸びることにより集電体に貫通孔が生じて短絡が発生することを好適に防止することが可能となる。
本発明における電極活物質層は、上記集電体の一方の表面に形成され正極活物質を含有する正極活物質層と、上記集電体の他方の表面に形成され負極活物質を含有する負極活物質層とからなるものである。
本発明に用いられる正極活物質層は、集電体の一方の表面に形成されるものであり、かつ正極活物質を含有するものである。
本発明に用いられる負極活物質層は、集電体の正極活物質層側とは反対側の表面に形成されるものであり、かつ負極活物質を含有するものである。
本発明における集電体について説明する。本発明における集電体の材料としては、導電性を有し、正極活物質層、負極活物質層、および補強層を集電体表面上に形成することが可能なものであれば特に限定されず、たとえば、ステンレス、アルミニウム、銅等を挙げることができる。
本発明に用いられるバイポーラ電極において、バイポーラ全固体電池の最外層に位置するバイポーラ電極の外側の面(図1中のT面)においては、通常、電極活物質層および補強層は形成されないものである。
本発明に用いられる固体電解質層は、固体電解質を有するものである。
また、固体電解質層は、上述の固体電解質材料の他に、結着材を含有していてもよい。なお、結着材については、上述した正極活物質層に用いられるものと同様とすることができるので、ここでの説明は省略する。
本発明のバイポーラ全固体電池は、上述したバイポーラ電極と、固体電解質層とを少なくとも有するものである。さらに通常は、電池ケースが用いられる。本発明に用いられる電池ケースとしては、一般的なバイポーラ全固体電池の電池ケースを用いることができ、例えばSUS製電池ケース等を挙げることができる。
本発明のバイポーラ全固体電池は、上述した固体電解質層を介して、複数のバイポーラ電極を積層させたものである。上記バイポーラ電極の積層数については、本発明のバイポーラ全固体電池の用途等に応じて適宜選択される。
次に、本発明のバイポーラ全固体電池の製造方法について説明する。
本発明のバイポーラ全固体電池の製造方法は、上述した「A.バイポーラ全固体電池」の項で説明したバイポーラ全固体電池の製造方法であって、集電体の端部の内側に位置し電極活物質層が形成される電極活物質層形成領域の端部と、上記集電体表面との間に補強層が配置されるように、上記補強層を上記集電体表面上に形成した後、上記電極活物質層形成領域に上記電極活物質層を形成することによりバイポーラ電極を形成するバイポーラ電極形成工程と、固体電解質層を形成する固体電解質層形成工程と、上記固体電解質層を介して複数の上記バイポーラ電極を積層させることによりバイポーラ全固体電池を組立てる組立工程とを有することを特徴とする製造方法である。
本発明におけるバイポーラ電極形成工程は、集電体の端部の内側に位置し電極活物質層が形成される電極活物質層形成領域の端部と、上記集電体表面との間に補強層が配置されるように、補強層を上記集電体表面上に形成した後、上記電極活物質層形成領域に上記電極活物質層を形成することによりバイポーラ電極を形成する工程である。
本発明における固体電解質層形成工程は、固体電解質層を形成する工程である。なお、本工程により形成される固体電解質層およびその形成方法については上述した「A.バイポーラ全固体電池」の項で説明した内容と同様とすることができるので、ここでの説明は省略する。
本発明における組立工程は、上記固体電解質層を介して複数の上記バイポーラ電極を積層させることによりバイポーラ全固体電池を組立てる組立工程である。本工程に用いられるバイポーラ全固体電池の組立方法については、上記固体電解質層を介して上記複数のバイポーラ電極を積層させることが可能な方法であれば特に限定されず、公知の方法とすることができる。また、本工程により得られるバイポーラ全固体電池については、上述した「A.バイポーラ全固体電池」の項で説明した内容と同様とすることができるので、ここでの説明は省略する。
本発明のバイポーラ全固体電池の製造方法は、上述した各工程以外にも必要な工程を適宜選択して行うことができる。このような工程としては、例えば、バイポーラ全固体電池を電池ケースに封入する工程や、拘束治具を配置する工程等を挙げることができる。
締結したバイポーラ全固体電池を、電圧4.2V~2Vの範囲において電流密度4.8mA/cm2で繰り返し充放電を実施した。
11 … 集電体
12 … 正極活物質層
13 … 負極活物質層
14 … 補強層
20 … 固体電解質層
100 … バイポーラ全固体電池
p … 正極活物質層の端部
q … 負極活物質層の端部
r、r’ … 補強層の端部
s … 集電体の端部
X12 … 正極活物質層形成領域
X13 … 負極活物質層形成領域
Claims (4)
- 集電体、並びに前記集電体の一方の表面に形成され正極活物質を含有する正極活物質層、および前記集電体の他方の表面に形成され負極活物質を含有する負極活物質層からなる電極活物質層を有するバイポーラ電極と、
固体電解質を含有する固体電解質層とを有し、
前記固体電解質層を介して複数の前記バイポーラ電極が積層されているバイポーラ全固体電池であって、
前記電極活物質層は前記集電体の端部の内側に形成され、
前記電極活物質層の端部と前記集電体表面との間には前記集電体表面上に形成された補強層が配置されていることを特徴とするバイポーラ全固体電池。 - 前記補強層が絶縁体であることを特徴とする請求の範囲第1項に記載のバイポーラ全固体電池。
- 前記集電体の端部が絶縁体で覆われていることを特徴とする請求の範囲第1項または請求の範囲第2項に記載のバイポーラ全固体電池。
- 請求項1に記載のバイポーラ全固体電池の製造方法であって、
集電体の端部の内側に位置し電極活物質層が形成される電極活物質層形成領域の端部と、前記集電体表面との間に補強層が配置されるように、前記補強層を前記集電体表面上に形成した後、前記電極活物質層形成領域に前記電極活物質層を形成することによりバイポーラ電極を形成するバイポーラ電極形成工程と、
固体電解質層を形成する固体電解質層形成工程と、
前記固体電解質層を介して複数の前記バイポーラ電極を積層させることによりバイポーラ全固体電池を組立てる組立工程と
を有することを特徴とするバイポーラ全固体電池の製造方法。
Priority Applications (6)
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US14/114,838 US9373869B2 (en) | 2011-05-27 | 2011-05-27 | Bipolar all-solid-state battery |
KR1020137030338A KR101577881B1 (ko) | 2011-05-27 | 2011-05-27 | 바이폴라 전고체 전지 |
CN201180070981.1A CN103548196B (zh) | 2011-05-27 | 2011-05-27 | 双极全固体电池 |
PCT/JP2011/062205 WO2012164642A1 (ja) | 2011-05-27 | 2011-05-27 | バイポーラ全固体電池 |
DE112011105286.3T DE112011105286B4 (de) | 2011-05-27 | 2011-05-27 | Bipolare Festkörperbatterie |
JP2013517709A JP5720779B2 (ja) | 2011-05-27 | 2011-05-27 | バイポーラ全固体電池 |
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PCT/JP2011/062205 WO2012164642A1 (ja) | 2011-05-27 | 2011-05-27 | バイポーラ全固体電池 |
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JP (1) | JP5720779B2 (ja) |
KR (1) | KR101577881B1 (ja) |
CN (1) | CN103548196B (ja) |
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CN103548196B (zh) | 2016-03-02 |
CN103548196A (zh) | 2014-01-29 |
US20140079992A1 (en) | 2014-03-20 |
US9373869B2 (en) | 2016-06-21 |
KR101577881B1 (ko) | 2015-12-15 |
JPWO2012164642A1 (ja) | 2014-07-31 |
DE112011105286T5 (de) | 2014-02-20 |
JP5720779B2 (ja) | 2015-05-20 |
KR20140009497A (ko) | 2014-01-22 |
DE112011105286B4 (de) | 2020-06-18 |
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