WO2013014759A1 - 固体電池の製造方法 - Google Patents
固体電池の製造方法 Download PDFInfo
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- WO2013014759A1 WO2013014759A1 PCT/JP2011/067057 JP2011067057W WO2013014759A1 WO 2013014759 A1 WO2013014759 A1 WO 2013014759A1 JP 2011067057 W JP2011067057 W JP 2011067057W WO 2013014759 A1 WO2013014759 A1 WO 2013014759A1
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- solid 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
- H01M10/058—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
- H01M10/05—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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0407—Methods of deposition of the material by coating on an electrolyte layer
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
- H01M50/406—Moulding; Embossing; Cutting
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
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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 method for producing a solid battery using a solid electrolyte.
- a lithium ion secondary battery (hereinafter sometimes referred to as a “lithium-based secondary battery”) has characteristics that it has a higher energy density than other secondary batteries and can operate at a high voltage. . For this reason, it is used as a secondary battery that can be easily reduced in size and weight in information equipment such as a mobile phone, and in recent years, there is an increasing demand for large motive power such as for electric vehicles and hybrid vehicles.
- a lithium ion secondary battery includes a positive electrode layer and a negative electrode layer, and an electrolyte layer disposed therebetween.
- the electrolyte included in the electrolyte layer include non-aqueous liquid and solid substances. Used. When a liquid electrolyte (hereinafter referred to as “electrolytic solution”) is used, the electrolytic solution easily penetrates into the positive electrode layer and the negative electrode layer. Therefore, an interface between the active material contained in the positive electrode layer or the negative electrode layer and the electrolytic solution is easily formed, and the performance is easily improved.
- electrolyte since the widely used electrolyte is flammable, it is necessary to mount a system for ensuring safety.
- solid electrolyte a solid electrolyte that is nonflammable
- solid electrolyte layer a layer containing a solid electrolyte
- Patent Document 1 discloses a step of producing a powdered positive electrode active material, a step of producing a powdered negative electrode active material, and a powdery material containing lithium element.
- the step of producing the electrolyte material, and the electrolyte material exists so as to be mixed with the positive electrode active material in the upper part or the lower part of the predetermined mold, and only the electrolyte material exists in the central part of the predetermined mold.
- a solid battery can be manufactured.
- the solid electrolyte layer is formed by pressing the powdered electrolyte material, cracking or the like is likely to occur in the solid electrolyte layer, and a short circuit is likely to occur if the solid electrolyte layer is thinned to improve output. Therefore, the technique disclosed in Patent Document 1 has a problem that it is difficult to manufacture a high-power solid battery.
- an object of the present invention is to provide a solid battery manufacturing method capable of manufacturing a high output solid battery.
- the present invention is a method of manufacturing a solid battery having a pair of electrode layers and a solid electrolyte layer disposed between the pair of electrode layers, the foil being disposed on at least one surface of the foil
- a pair of electrode layers refers to a positive electrode layer containing a positive electrode active material and a negative electrode layer containing a negative electrode active material.
- a frame body arranging step of arranging a frame body around the foil / electrolyte laminate it is preferable to have a frame body arranging step of arranging a frame body around the foil / electrolyte laminate.
- the foil is removed to cause a short circuit. It is possible to reduce the thickness of the solid electrolyte layer without causing pinholes or the like. By reducing the thickness of the solid electrolyte layer, the output of the solid battery can be increased. Therefore, according to this invention, the manufacturing method of a solid battery which can manufacture a high output solid battery can be provided.
- the frame body arranging step it is possible to press the foil / electrolyte laminate having the frame body arranged around it.
- the outer edge of the solid electrolyte layer can be brought into close contact with the frame, so that a pair of electrode layers are energized at the outer edge of the solid electrolyte layer (short circuit) Can be prevented. Therefore, by setting it as this form, it becomes easy to make high output the solid battery manufactured with the manufacturing method of this invention.
- FIG. 1 is a flowchart for explaining the manufacturing method of the present invention
- FIG. 2 is a diagram for explaining each process shown in FIG. 1 in a simplified manner.
- the manufacturing method of the present invention will be described with reference to FIGS. 1 and 2.
- the manufacturing method of the present invention shown in FIG. 1 includes a preparation step (S1), a frame arrangement step (S2), a pressing step (S3), a first electrode layer formation step (S4), and a removal step (S5). And a second electrode layer forming step (S6).
- the preparation step (hereinafter, sometimes referred to as “S1”) is a step of preparing a foil / electrolyte laminate having a foil and a solid electrolyte layer containing a binder disposed on at least one surface of the foil. .
- the form of S1 is not particularly limited as long as a foil / electrolyte laminate can be prepared.
- S1 is a process in which a slurry-like solid electrolyte composition prepared by adding a solid electrolyte and a binder to a liquid is applied to the surface of the foil 6 ′, and the liquid is volatilized.
- the frame body arranging step (hereinafter, sometimes referred to as “S2”) has the same dimensions as the foil / electrolyte laminate 4 ′ around the foil / electrolyte laminate 4 ′ prepared in S1, or the foil / electrolyte laminate 4 ′.
- This is a step of disposing the frame 5 having an opening larger than the electrolyte laminate 4 ′.
- the opening of the frame 5 is larger than the foil / electrolyte laminate 4 ′, the difference between the size of the opening of the frame 5 and the size of the foil / electrolyte laminate 4 ′ can form a convex portion 1a described later.
- the form of S2 is not particularly limited as long as it is a step of arranging a frame around the foil / electrolyte laminate.
- the foil / electrolyte laminate 4 ′ in which the frame body 5 is disposed in S2 is compressed in FIG. 2 so as to compress the solid electrolyte layer 1 ′.
- This is a step of pressing from the vertical direction of the paper.
- the foil / electrolyte having the solid electrolyte layer 1 and the foil 6 is formed on the outer edge of the foil / electrolyte laminate 4 with the convex portion 1 a in contact with the inner peripheral surface of the frame 5.
- the laminate 4 is in close contact with the frame 5.
- the pressure applied to the foil / electrolyte laminate 4 'by the pressing of S3 is not particularly limited. From the viewpoint of making it easy to prevent a pair of electrode layers from being short-circuited, it is preferable to form the convex portion 1a having a height of several nm or more (for example, 10 nm or more) in FIG. By applying a pressure of 500 MPa or less, it is possible to form the convex portion 1a having a height of several nm or more.
- the surface of the solid electrolyte layer 1 (the surface on which the foil 6 does not exist.
- FIG. 2 shows the upper surface of the solid electrolyte layer 1). 2), and the electrode material 2 (positive electrode layer or negative electrode) is formed on one surface of the solid electrolyte layer 1 by pressing the electrode material and the solid electrolyte layer 1 from above and below in FIG. Layer).
- the pressure applied to the electrode material or the foil / electrolyte laminate 4 by the pressing of S4 is not particularly limited as long as it is a pressure capable of forming an electrode layer of a solid battery, and can be, for example, 1 MPa or more and 500 MPa or less.
- the electrode material laminated on the surface of the solid electrolyte layer 1 in S4 contains, for example, an active material (positive electrode active material or negative electrode active material) and a solid electrolyte, and in addition, a binder that binds the active material and the solid electrolyte.
- a conductive material for improving conductivity may be contained.
- the removing step (hereinafter referred to as “S5”) is a step of removing the foil 6 disposed on one surface of the solid electrolyte layer 1 (the lower surface of the solid electrolyte layer 1 in FIG. 2) after S4. is there.
- the form of S5 is not particularly limited as long as the foil 6 can be removed from one surface of the solid electrolyte layer 1.
- S5 can be a step of peeling the foil 6 from the solid electrolyte layer 1, for example.
- S5 can also be set as the process of removing the foil 6 by immersing the frame 5 in the liquid and dissolving the foil 6, for example.
- the second electrode forming step (hereinafter, sometimes referred to as “S6”), the surface of the solid electrolyte layer 1 on which the foil 6 is disposed after S5 (hereinafter referred to as “the other side of the solid electrolyte layer 1”). 2), the electrode material, the solid electrolyte layer 1, and the electrode layer 2 are pressed from above and below to compress the other electrode of the solid electrolyte layer 1.
- an electrode layer 3 (a negative electrode layer when the electrode layer 2 is a positive electrode layer; a positive electrode layer when the electrode layer 2 is a negative electrode layer) is formed on the surface.
- the pressure applied to the electrode material, the solid electrolyte layer 1 and the electrode layer 2 by the pressing of S6 is not particularly limited as long as it is a pressure capable of forming the electrode layer of the solid battery, and is, for example, 1 MPa to 500 MPa. be able to.
- the electrode material laminated on the other surface of the solid electrolyte layer 1 in S6 contains, for example, an active material (negative electrode active material or positive electrode active material) and a solid electrolyte, and in addition, binds the active material and the solid electrolyte.
- the binder to be made and the electroconductive material which improves electroconductivity may contain.
- the solid electrolyte layer 1, the electrode layer 2 formed on one surface of the solid electrolyte layer 1, and the other of the solid electrolyte layer 1 are used.
- a solid battery having the electrode layer 3 formed on the surface can be manufactured.
- the solid electrolyte layer 1 can be made thin without causing pinholes or the like that cause a short circuit by adopting the form having S1 for preparing the foil / electrolyte laminate, so that the solid electrolyte layer It becomes possible to increase the output of the solid state battery having 1.
- a current collector can be connected to each of the electrode layer 2 and the electrode layer 3, and the solid battery can be sealed with an exterior material such as a laminate film.
- the convex portion 1a can be formed on the outer edge of the foil / electrolyte laminate 4 in the subsequent S3, The outer edge of the electrolyte layer 1 can be adhered to the frame 5.
- the conductive material constituting the electrode layer 2 and the conductive substance constituting the electrode layer 3 wrap around the outer edge of the solid electrolyte layer 1 and energize ( Short circuit) can be prevented.
- the solid electrolyte contained in the solid electrolyte layer a known solid electrolyte that can be used in a solid battery can be appropriately used.
- a solid electrolyte include Li 3 PS 4 and sulfide solid electrolytes such as Li 2 S—P 2 S 5 prepared by mixing Li 2 S and P 2 S 5 , Li 3 PO 4, and the like.
- oxide solid electrolytes, nitride solid electrolytes, halide solid electrolytes, and the like examples of the solid electrolyte is not particularly limited, and may be an amorphous solid electrolyte or glass ceramics in addition to a crystalline solid electrolyte.
- the binder that binds the solid electrolytes to the solid electrolyte layer from the viewpoint of making it easy to prevent pinholes and the like, and making the foil easy to peel off without breaking the solid electrolyte layer. It is preferable to contain.
- examples of such a binder include styrene butadiene rubber (SBR).
- SBR styrene butadiene rubber
- the binder is preferably 1% by mass or less.
- a liquid used when producing a solid electrolyte layer a known liquid that can be used when preparing a slurry-like composition used when producing a solid electrolyte layer of a lithium ion secondary battery can be appropriately used.
- a liquid heptane etc. can be illustrated and a nonpolar solvent can be used preferably.
- the foil 6 constituting the foil / electrolyte laminate 4 can form the thinned solid electrolyte layer 1 without causing pinholes or the like causing a short circuit, the form is particularly good. It is not limited.
- the foil 6 for example, an Al foil, a release film such as polyester or polyethylene terephthalate (PET), or the like can be used.
- the thickness of the foil 6 can be, for example, not less than 1 ⁇ m and not more than 150 ⁇ m.
- the shape of the frame 5 is not particularly limited as long as the convex portion 1a can be formed.
- the material of the frame 5 is not particularly limited, but from the viewpoint of hardness, elastic modulus, etc., it is preferable to use ceramics such as Macor (“Macor” is a registered trademark of Corning Incorporated, USA).
- the positive electrode active material contained in the positive electrode layer a known active material that can be contained in the positive electrode layer of the lithium ion secondary battery can be appropriately used.
- a positive electrode active material in addition to a layered active material such as lithium cobaltate (LiCoO 2 ) and lithium nickelate (LiNiO 2 ), an olivine type active material such as olivine type lithium iron phosphate (LiFePO 4 ), A spinel type active material such as spinel type lithium manganate (LiMn 2 O 4 ) can be exemplified.
- the well-known solid electrolyte which can be contained in the positive electrode layer of a lithium ion secondary battery can be used suitably.
- examples of such a solid electrolyte include the solid electrolyte that can be contained in the solid electrolyte layer.
- the positive electrode layer may contain a binder for binding the positive electrode active material and the solid electrolyte and a conductive material for improving conductivity.
- examples of the binder that can be contained in the positive electrode layer include styrene butadiene rubber (SBR), and examples of the conductive material that can be contained in the positive electrode layer include vapor grown carbon fiber (VGCF).
- SBR styrene butadiene rubber
- examples of the conductive material that can be contained in the positive electrode layer include vapor grown carbon fiber (VGCF).
- VGCF is a registered trademark of Showa Denko KK, and the same applies hereinafter.
- carbon materials such as carbon black, as well as metal materials that can withstand the environment when using a solid state
- the negative electrode active material contained in the negative electrode layer a known active material that can be contained in the negative electrode layer of the lithium ion secondary battery can be appropriately used.
- examples of such an active material include graphite.
- the well-known solid electrolyte which can be contained in the negative electrode layer of a lithium ion secondary battery can be used suitably.
- examples of such a solid electrolyte include the solid electrolyte that can be contained in the positive electrode layer.
- the negative electrode layer may contain a binder for binding the negative electrode active material and the solid electrolyte and a conductive material for improving conductivity. Examples of the binder and conductive material that can be contained in the negative electrode layer include the binder and conductive material that can be contained in the positive electrode layer.
- the current collector when a current collector is connected to each of the electrode layer 2 and the electrode layer 3, the current collector is a known conductive material that can be used as a positive electrode current collector or a negative electrode current collector of a lithium ion secondary battery. It can be composed of a sex material. Examples of such a conductive material include one or more elements selected from the group consisting of Cu, Ni, Al, V, Au, Pt, Mg, Fe, Ti, Co, Cr, Zn, Ge, and In. Examples of the metal material to be included are illustrated. In addition, the current collector can be formed into a shape such as a metal foil or a metal mesh, for example.
- the form having the frame arrangement process is illustrated after the preparation process, but the manufacturing method of the present invention is not limited to this form.
- This invention can also be set as the form which does not have a frame body arrangement
- it is assumed to have a form having a frame arrangement step after the preparation step. Is preferred.
- the manufacturing method of this invention is the said form. It is not limited.
- the solid electrolyte layer may not be pressed in advance before the electrode layer is formed.
- the solid battery is exemplified as a lithium ion secondary battery, but the manufacturing method of the present invention is not limited to this form.
- the solid battery produced by the present invention can be configured such that ions other than lithium ions move between the positive electrode layer and the negative electrode layer. Examples of such ions include sodium ions and potassium ions.
- the positive electrode active material, the solid electrolyte, and the negative electrode active material may be appropriately selected depending on the moving ions.
- the battery was produced by the production method of the present invention (Example) and the production method other than the present invention (Comparative Example), and the performance of the produced battery was evaluated.
- Electrode material and solid electrolyte composition ⁇ Positive electrode mixture (electrode material) 12.03 mg of positive electrode active material (LiNi 1/3 Co 1/3 Mn 1/3 O 2 , manufactured by Nichia Corporation), 0.51 mg of VGCF (manufactured by Showa Denko KK), and the above steps 5.03 mg of the produced solid electrolyte (Li 2 S—P 2 S 5 ) was weighed and mixed to obtain a positive electrode mixture.
- positive electrode active material LiNi 1/3 Co 1/3 Mn 1/3 O 2 , manufactured by Nichia Corporation
- VGCF manufactured by Showa Denko KK
- Negative electrode mixture (electrode material) By weighing 9.06 mg of the negative electrode active material (graphite, manufactured by Mitsubishi Chemical Corporation) and the solid electrolyte (Li 2 S—P 2 S 5 ) prepared in the above step, and mixing them, A negative electrode mixture was obtained.
- Solid electrolyte composition To 500 mg of the solid electrolyte (Li 2 S—P 2 S 5 ) prepared in the above step, 3.5 mg of styrene butadiene rubber is added, and further 1000 mg of heptane is added to form a slurry solid electrolyte composition A product was made.
- ⁇ Foil / electrolyte laminate production> The prepared slurry-like solid electrolyte composition is applied to a 15 ⁇ m thick Al foil with a gap of 200 ⁇ m (the distance between the Al foil and the doctor blade is 200 ⁇ m) to form an 80 ⁇ m thick solid electrolyte layer.
- a foil / electrolyte laminate was prepared. The vertical and horizontal lengths of the solid electrolyte layer were each several centimeters.
- the solid battery of the example was produced by forming the negative electrode layer.
- Comparative example 1 18 mg of the solid electrolyte (Li 2 S—P 2 S 5 ) prepared in the above process was weighed, and pressed at 100 MPa without placing a frame around the solid electrolyte, thereby having a thickness of 40 ⁇ m and a size of 1 cm 2 . A solid electrolyte layer was prepared. Thereafter, 17.57 mg of the positive electrode mixture was placed on the upper surface of the produced solid electrolyte layer, and pressed at 100 MPa to form a positive electrode layer having a size of 1 cm 2 .
- Comparative example 2 21.6 mg of the solid electrolyte (Li 2 S—P 2 S 5 ) prepared in the above process was weighed and pressed at 100 MPa without placing a frame around the solid electrolyte, so that the thickness was 40 ⁇ m and the size was 1 A 2 cm 2 solid electrolyte layer was prepared. Thereafter, 17.57 mg of the positive electrode mixture was placed on the upper surface of the produced solid electrolyte layer, and pressed at 100 MPa to form a positive electrode layer having a size of 1 cm 2 . Thereafter, 17.3 mg of the negative electrode mixture is placed with the surface of the solid electrolyte layer on the side where the positive electrode layer is not formed facing up, and pressed at 400 MPa to form a negative electrode layer having a size of 1 cm 2. A solid battery of Comparative Example 2 was produced.
- Comparative example 3 18 mg of the solid electrolyte (Li 2 S—P 2 S 5 ) prepared in the above process is weighed and placed at the center of the ceramic (Macor) frame (the part where no frame is present) and pressed at 100 MPa. Thus, a solid electrolyte layer having a thickness of 40 ⁇ m and a size of 1 cm 2 was produced. Thereafter, 17.57 mg of the positive electrode mixture was placed on the upper surface of the produced solid electrolyte layer, and pressed at 100 MPa to form a positive electrode layer having a size of 1 cm 2 .
- the voltage of the battery of the example was 4.2V. That is, no short circuit occurred in the battery of the example.
- the battery of Comparative Example 1, the battery of Comparative Example 2, and the battery of Comparative Example 3 had a voltage of 0 V, causing a short circuit.
- the short circuit occurred in the battery of Comparative Example 1 because the particles constituting the positive electrode layer and the negative electrode layer slipped off the outer edge of the solid electrolyte layer, and the positive electrode layer and the negative electrode layer were connected via the slipped particles. is there.
- the solid electrolyte layer produced by pressing the solid electrolyte is difficult to handle and easily breaks by itself.
- the short circuit occurred in the battery of Comparative Example 2 at the time of pressing, almost no pressure was applied to the outer edge of the solid electrolyte layer where the electrode layer was not formed, and the outer edge of the solid electrolyte layer was cracked. This is because the positive electrode layer and the negative electrode layer are connected to each other through particles that have slipped from the positive electrode layer and the negative electrode layer. As described above, when a space is provided at the outer edge of the solid electrolyte layer, cracks and slipping occur at the outer edge, causing a short circuit. Moreover, it is thought that the short circuit occurred in the battery of Comparative Example 3 because the solid electrolyte layer was cracked because the binder was not included in the solid electrolyte layer. As described above, according to the present invention, it was possible to manufacture a high output solid state battery.
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Abstract
Description
本発明は、一対の電極層と、該一対の電極層の間に配置された固体電解質層とを有する固体電池を製造する方法であって、箔、及び、該箔の少なくとも一方の面に配置されたバインダーを含有する固体電解質層、を有する箔・電解質積層体を準備する準備工程と、該準備工程で準備された箔・電解質積層体の、固体電解質層の表面に電極材を積層し、プレスして電極層を形成する電極層形成工程と、該電極層形成工程後に、箔を除去する除去工程と、を有することを特徴とする、固体電池の製造方法である。
Li2S(日本化学工業株式会社製)及びP2S5(アルドリッチ社製)を出発原料として、0.7656gのLi2S、及び、1.2344gのP2S5を秤量した。次に、これらをメノウ乳鉢に入れて5分間に亘って混合した後、4gのヘプタンを入れ、遊星型ボールミルを用いて40時間に亘ってメカニカルミリングすることにより、硫化物系固体電解質としてのLi2S-P2S5を作製した。
・正極合剤(電極材)
12.03mgの正極活物質(LiNi1/3Co1/3Mn1/3O2、日亜化学工業株式会社製)、0.51mgのVGCF(昭和電工株式会社製)、及び、上記工程で作製した固体電解質(Li2S-P2S5)を5.03mg秤量し、これらを混合することによって、正極合剤を得た。
9.06mgの負極活物質(グラファイト、三菱化学株式会社製)、及び、上記工程で作製した固体電解質(Li2S-P2S5)を8.24mg秤量し、これらを混合することによって、負極合剤を得た。
上記工程で作製した固体電解質(Li2S-P2S5)500mgに3.5mgのスチレンブタジエンゴムを添加し、さらに1000mgのヘプタンを添加して、スラリー状の固体電解質組成物を作製した。
厚さ15μmのAl箔に、作製したスラリー状の固体電解質組成物を、ギャップ200μm(Al箔とドクターブレードとの距離が200μm)で塗工することにより、厚さ80μmの固体電解質層を形成し、箔・電解質積層体を作製した。固体電解質層の縦及び横の長さは、それぞれ数cmとした。
1cm2の大きさに打ち抜いた箔・電解質積層体の外縁を、セラミックス(マコール)製の枠体で被った後、箔・電解質積層体を、100MPaでプレスした。プレス後の固体電解質層の厚さは40μmであった。その後、固体電解質層の上面に、17.57mgの上記正極合剤を配置して、100MPaでプレスすることにより、1cm2の大きさの正極層を形成した。その後、固体電解質層からAl箔を除去し、Al箔と接触していた側の固体電解質層の面に、17.3mgの上記負極合剤を配置し、400MPaでプレスして1cm2の大きさの負極層を形成することにより、実施例の固体電池を作製した。
・比較例1
上記工程で作製した固体電解質(Li2S-P2S5)を18mg秤量し、固体電解質の周囲に枠体を配置しないまま、100MPaでプレスすることにより、厚さ40μm且つ大きさ1cm2の固体電解質層を作製した。その後、作製した固体電解質層の上面に、17.57mgの上記正極合剤を配置して、100MPaでプレスすることにより、大きさ1cm2の正極層を形成した。その後、正極層が形成されていない側の固体電解質層の面を上にして、17.3mgの上記負極合剤を配置し、400MPaでプレスして大きさ1cm2の負極層を形成することにより、比較例1の固体電池を作製した。
上記工程で作製した固体電解質(Li2S-P2S5)を21.6mg秤量し、固体電解質の周囲に枠体を配置しないまま、100MPaでプレスすることにより、厚さ40μm且つ大きさ1.2cm2の固体電解質層を作製した。その後、作製した固体電解質層の上面に、17.57mgの上記正極合剤を配置して、100MPaでプレスすることにより、大きさ1cm2の正極層を形成した。その後、正極層が形成されていない側の固体電解質層の面を上にして、17.3mgの上記負極合剤を配置し、400MPaでプレスして大きさ1cm2の負極層を形成することにより、比較例2の固体電池を作製した。
セラミックス(マコール)製の枠体の中央部(枠が存在しない部位)に、上記工程で作製した固体電解質(Li2S-P2S5)を18mg秤量して配置し、100MPaでプレスすることにより、厚さ40μm且つ大きさ1cm2の固体電解質層を作製した。その後、作製した固体電解質層の上面に、17.57mgの上記正極合剤を配置して、100MPaでプレスすることにより、大きさ1cm2の正極層を形成した。その後、正極層が形成されていない側の固体電解質層の面を上にして、17.3mgの上記負極合剤を配置し、400MPaでプレスして大きさ1cm2の負極層を形成することにより、比較例3の固体電池を作製した。
上記工程で作製した実施例の電池、比較例1の電池、比較例2の電池、及び、比較例3の電池を、それぞれ0.3mAで4.2Vまで定電流充電した後、2.5Vになるまで0.3mAで放電を行った。その後、4.2Vで24時間に亘って保持し、電圧の低下状況を調査した。結果を図3に示す。図3の縦軸は電池電圧[V]である。
2、3…電極層
4、4’…箔・電解質積層体
5…枠体
6、6’…箔
Claims (2)
- 一対の電極層と、該一対の電極層の間に配置された固体電解質層とを有する固体電池を製造する方法であって、
箔、及び、該箔の少なくとも一方の面に配置されたバインダーを含有する固体電解質層、を有する箔・電解質積層体を準備する準備工程と、
前記準備工程で準備された前記箔・電解質積層体の、前記固体電解質層の表面に電極材を積層し、プレスして電極層を形成する電極層形成工程と、
前記電極層形成工程後に、前記箔を除去する除去工程と、
を有することを特徴とする、固体電池の製造方法。 - 前記箔・電解質積層体の周囲に枠体を配置する枠体配置工程を有することを特徴とする、請求項1に記載の固体電池の製造方法。
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