WO2019131503A1 - 全固体電池、その製造方法および加工装置 - Google Patents
全固体電池、その製造方法および加工装置 Download PDFInfo
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- WO2019131503A1 WO2019131503A1 PCT/JP2018/047234 JP2018047234W WO2019131503A1 WO 2019131503 A1 WO2019131503 A1 WO 2019131503A1 JP 2018047234 W JP2018047234 W JP 2018047234W WO 2019131503 A1 WO2019131503 A1 WO 2019131503A1
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- laminate
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0463—Cells or batteries with horizontal or inclined electrodes
-
- 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
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/18—Cells with non-aqueous electrolyte with 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
- H01M10/052—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
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0065—Solid electrolytes
- H01M2300/0068—Solid electrolytes inorganic
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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
Definitions
- the present invention relates to an all solid state battery and a method of manufacturing the same.
- the conventional all solid battery is a battery including a laminate (a positive electrode layer, a solid electrolyte layer and a negative electrode layer) containing powder, a positive electrode current collector, and a negative electrode current collector. Since the laminate is a powder film, powder collapse and the like occur particularly at the end portions, which may cause a short circuit between the positive electrode active material and the negative electrode active material.
- Patent Literatures 1 and 2 disclose that the positive electrode layer is surrounded by an insulator in order to prevent a short circuit at an end portion caused by an end portion collapse or an end portion collapse of the laminate.
- Japanese Patent Publication Japanese Patent Application Laid-Open No. 2015-125893 (released on July 6, 2015)
- Japanese Patent Publication Japanese Patent Application Laid-Open No. 2015-162353 (released on September 7, 2015)
- An aspect of the present invention is directed to preventing edge collapse of a laminate constituting an all-solid-state battery.
- the manufacturing method of the all solid battery concerning one mode of the present invention has the 1st electrode layer, the 2nd electrode layer which has the opposite polarity to the polarity of the 1st electrode layer, and the above A laminate forming step of forming a laminate including a first electrode layer and a solid electrolyte layer interposed between the second electrode layers, and a cutting-off step of cutting off an outer peripheral end of the laminate;
- the body contains powder material.
- the all-solid-state battery comprises a first electrode layer, a second electrode layer having a polarity opposite to the polarity of the first electrode layer, and the first electrode It is an all-solid battery in which a solid electrolyte layer interposed between the layer and the second electrode layer is laminated on a support plate, and the area of the interface between the first electrode layer and the solid electrolyte layer is the solid
- the side surface of the all-solid-state battery is inclined, which is smaller than the area of the interface between the electrolyte layer and the second electrode layer.
- FIG. 13 is a cross-sectional view taken along line AA of FIG. 12; It is sectional drawing which shows the structure of the pond which shows the structure of the all-solid-state battery which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the structure of the pond which shows the structure before the all-solid-state battery shown in FIG. 14 is cut out from a large-area all-solid-state battery. It is a top view which shows the structure of the screen used for the apparatus shown in FIG.
- FIG. 18 is a view showing another precision punching device according to Embodiment 5. It is a figure which shows the precision punching apparatus which concerns on the comparative example of Embodiment 5.
- FIG. 18 is a view showing another precision punching device according to Embodiment 5. It is a figure which shows the precision punching apparatus which concerns on the comparative example of Embodiment 5.
- Embodiment 1 The following description will explain Embodiment 1 of the present invention with reference to FIGS. 1 to 8.
- an all solid secondary battery using a lithium ion conductive solid electrolyte that is, an all solid lithium ion secondary battery will be described as an example of the all solid battery.
- the all-solid-state battery according to the present invention is, of course, not limited to the all-solid-state lithium ion secondary battery.
- FIG. 1 is a cross-sectional view showing the structure of the all-solid battery 101 according to the first embodiment.
- the all-solid battery 101 includes all-solid batteries 1 to 5, a positive electrode current collector 6, a negative electrode current collector 7, and a package 8.
- the all-solid-state battery 101 is configured by connecting, in parallel, a plurality of all-solid-state batteries 1 to 5 that operate alone. All-solid battery 101 may be configured by connecting all-solid batteries 1 to 5 in series. Further, in FIG. 1, all the solid batteries 1 to 5, the positive electrode current collector 6 and the negative electrode current collector 7 are drawn at intervals, for convenience, but adjacent ones are in contact with each other. FIG. 8 described later is also drawn similarly to FIG.
- the package 8 is a box-like housing which contains all the solid batteries 1 to 5.
- the all solid batteries 1 to 5 are arranged in order of the all solid battery 1, the all solid battery 2, the all solid battery 3, the all solid battery 4 and the all solid battery 5 from the negative electrode side.
- the all-solid battery 1 is configured by laminating a positive electrode current collector 11, a laminate 12, and a negative electrode current collector 13 in this order.
- the all-solid battery 2 is configured by laminating a positive electrode current collector 21, a laminate 22, and a negative electrode current collector 23 in this order.
- the all-solid battery 3 is configured by laminating a positive electrode current collector 31, a laminate 32, and a negative electrode current collector 33 in this order.
- the all-solid battery 4 is configured by laminating a positive electrode current collector 41, a laminate 42, and a negative electrode current collector 43 in this order.
- the all-solid battery 5 is configured by laminating a positive electrode current collector 51, a laminate 52, and a negative electrode current collector 53 in this order.
- the all-solid-state battery 1 is arrange
- the all solid battery 5 is disposed such that the positive electrode current collector 51 of the all solid battery 5 is positioned on the positive electrode side.
- all solid batteries 1 and 2 are disposed such that positive electrode current collector 11 of all solid battery 1 and positive electrode current collector 21 of all solid battery 2 are opposed to each other.
- the all solid batteries 2 and 3 are arranged such that the negative electrode current collector 23 of the all solid battery 2 and the negative electrode current collector 33 of the all solid battery 3 are opposed to each other.
- the all solid batteries 3 and 4 are arranged such that the positive electrode current collector 31 of the all solid battery 3 and the positive electrode current collector 41 of the all solid battery 4 are opposed to each other.
- the all solid batteries 4 and 5 are disposed such that the negative electrode current collector 43 of the all solid battery 4 and the negative electrode current collector 53 of the all solid battery 5 are opposed to each other.
- the planar shape of all the solid batteries 1 to 5 is a square (for example, a square), but the shape is not limited to the square as long as all the solid batteries 1 to 5 can be accommodated in the package 8.
- the planar shape of all the solid batteries 1 to 5 may be a circle, a polygon, or a shape consisting of straight lines and curves.
- all the solid batteries 1 to 5 are usually formed to have the same planar shape and the same size (area).
- the laminates 12, 22, 32, 42, and 52 each include a positive electrode layer (first electrode layer), a negative electrode (second electrode layer) having a polarity opposite to the polarity of the positive electrode layer, and the positive electrode layer and the negative electrode layer. And a solid electrolyte layer interposed therebetween, which is a stacked structure.
- the positive electrode layer is formed only of a mixture (mixture) of a positive electrode active material and a solid electrolyte, or a positive electrode active material.
- the weight ratio of the positive electrode active material to the solid electrolyte in the above mixture is, for example, 7: 3.
- materials generally used for the positive electrode active material in the all solid battery field can be used.
- a lithium-containing oxide for example, lithium cobaltate (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 or the like)
- LiCoO 2 lithium cobaltate
- LiNiO 2 lithium nickelate
- LiMnO 2 or the like lithium manganate
- the negative electrode layer is formed only of a mixture (mixture) of a negative electrode active material and a solid electrolyte, or the negative electrode active material.
- the weight ratio of the negative electrode active material to the solid electrolyte in the above mixture is, for example, 6: 4.
- materials generally used for the negative electrode active material in the all solid battery field can be used.
- graphite naturally graphite, artificial graphite, etc.
- carbon material graphite carbon fiber, resin-baked carbon, etc.
- tin lithium, oxide, sulfide, nitride, alloy, etc., powder or foil It can be used regardless of the shape, etc.
- the solid electrolyte used for the positive electrode layer the solid electrolyte layer and the negative electrode layer, materials and the like usually used in the lithium ion battery field are used.
- examples of such solid electrolytes include materials composed of organic compounds, inorganic compounds, and both organic and inorganic compounds.
- sulfides such as Li 2 S—P 2 S 5 are superior in ion conductivity as compared with other inorganic compounds.
- the positive electrode current collector 6 is constituted by positive electrode current collectors 61 to 63.
- the positive electrode current collector 61 is disposed between the inner surface of the package 8 on the positive electrode side and the positive electrode current collector 51 of the all solid battery 5 so as to be in contact with the positive electrode current collector 51.
- the positive electrode current collector 62 is disposed between the positive electrode current collector 31 of the all solid battery 3 and the positive electrode current collector 41 of the all solid battery 4 so as to be in contact with both.
- the positive electrode current collector 63 is disposed between the positive electrode current collector 11 of the all solid battery 1 and the positive electrode current collector 21 of the all solid battery 2 so as to be in contact with both.
- the positive electrode terminal 60 is connected to the end of the positive electrode current collectors 61 to 63.
- the positive electrode terminal 60 is disposed so as to be exposed to the outside from a part of the package 8, for example, the vicinity of one end side of the all-solid-state battery 5 on the side surface of the package 8.
- the positive electrode current collector 6 can be electrically connected to an external predetermined portion.
- the negative electrode current collector 7 is composed of negative electrode current collectors 71 to 73.
- the negative electrode current collector 71 is disposed between the inner surface of the package 8 on the negative electrode side and the negative electrode current collector 13 of the all solid battery 1 so as to be in contact with the negative electrode current collector 13.
- the negative electrode current collector 72 is disposed between the negative electrode current collector 23 of the all solid battery 2 and the negative electrode current collector 33 of the all solid battery 3 so as to be in contact with both.
- the negative electrode current collector 73 is disposed between the negative electrode current collector 43 of the all solid battery 4 and the negative electrode current collector 53 of the all solid battery 5 so as to be in contact with both.
- the negative electrode terminal 70 is connected to the end of the negative electrode current collectors 71 to 73.
- the negative electrode terminal 70 is disposed so as to be exposed to the outside from a part of the package 8, for example, the vicinity of one end side (the opposite side to the positive electrode terminal 60) of the all solid battery 1 on the side surface of the package 8.
- the negative electrode current collector 7 can be electrically connected to an external predetermined portion.
- the positive electrode terminal 60 and the negative electrode terminal 70 are separately disposed on both sides of the package 8 for ease of illustration.
- the position where the positive electrode terminal 60 and the negative electrode terminal 70 are disposed is not limited to the above position, and may be anywhere in the package 8.
- the location which current-collects with the positive electrode terminal 60 and the negative electrode terminal 70 is not necessarily one each for positive / negative electrode. It is also possible to collect current at multiple locations from each of the positive and negative electrodes.
- the package 8 (at least the inner surface) is preferably formed to have insulation. Alternatively, it is preferable to insert an insulator between the package 8 and the all solid batteries 1 to 5 or between the package 8 and the positive electrode current collectors 61 to 63 and the negative electrode current collectors 71 to 73.
- the positive electrode current collector 6, the negative electrode current collector 7, the positive electrode terminal 60, and the negative electrode terminal 70 are copper, magnesium, stainless steel, titanium, iron, cobalt, nickel, zinc, aluminum, germanium, indium, lithium, tin, or these Is formed using any of the alloys as a material.
- the form of the positive electrode current collectors 61 to 63 and the negative electrode current collectors 71 to 73 is a plate, a foil, a powder, a film, or the like.
- the positive electrode current collectors 61 to 63 are formed of aluminum foil
- the negative electrode current collectors 71 to 73 are formed of copper foil.
- the materials for forming the positive electrode current collector 6, the negative electrode current collector 7, the positive electrode terminal 60, and the negative electrode terminal 70 preferably have a certain degree of toughness and rigidity.
- the positive electrode current collectors 11, 21, 31, 41 and 51 are mutually connected by the positive electrode terminal 60, and the negative electrode current collectors 13, 23, 33, 43, 53 are connected in parallel by being mutually connected by the negative electrode terminal 70.
- the all-solid battery 101 of the present embodiment includes all-solid batteries 1 to 5, the number of all-solid batteries is not limited to five.
- the all solid state battery 101 has an odd numbered layer structure in which five layer all solid state batteries 1 to 5 are stacked.
- the all solid state battery 101 may have a structure having an even layer all solid state battery.
- FIG. 2 is a view showing a film forming method of the laminates 12, 22, 32, 42, 42 of the all-solid-state battery 101 according to the first embodiment.
- the powder film-forming method using a well-known electrostatic force as needed for example, electrostatic coating and the electrostatic screen film-forming method (printing method)
- a method of forming the laminates 12, 22, 32, 42, and 52 by an electrostatic screen deposition method will be described.
- the laminated body of the all-solid-state battery which concerns on Embodiment 2 mentioned later is also formed by the following film-forming methods.
- laminates 12, 22, 32, 42, and 52 are manufactured by an electrostatic screen film formation method.
- FIG. 2 an apparatus shown in FIG. 2 is used.
- This apparatus comprises a porous screen 201 and a substrate B which is a pedestal on which a substrate to be film-formed is placed.
- the negative electrode of the DC power source DC is connected to the screen 201, and the substrate B is a positive electrode of the DC power source DC. Is connected.
- the positive electrode of the DC power supply DC may be connected to the screen 201, and the negative electrode of the DC power supply DC may be connected to the substrate B.
- it since it suffices to generate a potential difference between the screen 201 and the printed material, it is not necessary to connect one to the positive electrode and not to connect the other to the negative electrode, and one may be the ground (earth) potential. .
- a commercially available mesh for screen printing can be used.
- the powder can be formed into an arbitrary shape by appropriately changing the opening shape of the mesh.
- a mesh having a mesh number of 300 / inch, a wire diameter of 30 ⁇ m, and an opening of 55 ⁇ m was employed.
- the material of the mesh is not limited as long as it has conductivity.
- the above mesh employed in the present embodiment is a general SUS mesh.
- the mesh used as the screen 201 it is preferable to appropriately select the number of meshes, the wire diameter, the opening, the material, and the like according to the powder and the environment.
- the powder 202 is brought into contact with the screen 201 by imprinting the powder 202 onto the screen 201 by the imprinting body 203. Thereby, the powder 202 is charged. When the charged powder 202 falls through the screen 201, it is electrostatically induced to adhere to the substrate. Thus, the positive electrode layer, the solid electrolyte layer, and the negative electrode layer of each of the laminates 12, 22, 32, 42, and 52 are formed into a film.
- each layer is performed from the step of forming the positive electrode layer on the support plate using the apparatus 2 shown in FIG.
- the support plate supports the substrate, the current collector, and the laminate.
- the support plate itself may function as a substrate or a current collector.
- the distance between the screen 201 and the substrate B is 10 mm, and the applied voltage is 5 kV.
- a solid electrolyte layer is formed on the positive electrode layer by the same positive film method as the positive electrode layer.
- the negative electrode layer is formed on the solid electrolyte layer by the same film forming method as the positive electrode layer.
- each layer is not limited to the order of film formation described above, and film formation may be started from any layer. Moreover, after forming a single substance of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer as needed, each may be pressurized and planarized.
- pressurization a pressure of several t / cm 2 is applied to the laminate for several seconds to several tens of seconds.
- pressurization may be performed in a state where the negative electrode current collector is laminated on the laminate.
- the positive electrode layer, the solid electrolyte layer, and the negative electrode layer of the laminate compressed by the above pressure are each strongly integrated.
- the positive electrode layer, the solid electrolyte layer, and the negative electrode layer are formed to be appropriately thin several tens ⁇ m to one hundred and several tens ⁇ m.
- the total thickness of the layers is reduced to about 100 to 400 ⁇ m.
- the weight of each layer in the laminate, the thickness of each layer, the weight ratio between layers, and the like are not limited to a specific range.
- the ratio of the thickness of the negative electrode layer to the thickness of the positive electrode layer is preferably 1.0 or more.
- each of the laminated bodies 12, 22, 32, 42, and 52 is obtained by cutting off the outer peripheral edge part of the laminated body obtained by said pressure processing.
- FIG. 3 are diagrams showing each step in the first manufacturing method of the all-solid-state battery 101.
- FIG. (A) to (d) of FIG. 4 are diagrams showing respective steps in the second manufacturing method of the all-solid battery 101.
- FIG. 5 is a view showing a precision punching apparatus used to manufacture the all-solid-state battery 101.
- FIG. 6 is a view showing a state in which the outer peripheral end is cut off from the laminated body 501 in the manufacture of the all-solid-state battery 101 by division by the chocolate breaking method.
- FIG. 7 is a view showing a state in which the outer peripheral end is cut off from the laminated body 501 in the manufacture of the all-solid-state battery 101 by another division by the chocolate breaking method.
- the positive electrode layer 302 is formed in a square on the support plate 301 (supporting plate) formed in a square, using the apparatus shown in FIG. .
- the positive electrode layer 302 is pressurized.
- the solid electrolyte layer 303 is formed on the positive electrode layer 302 in the same shape and the same size as the positive electrode layer 302.
- the solid electrolyte layer 303 is formed such that the outer peripheral end of the solid electrolyte layer 303 overlaps the outer peripheral end of the positive electrode layer 302.
- the solid electrolyte layer 303 is pressurized.
- the negative electrode layer 304 is formed on the solid electrolyte layer 303 in the same shape and the same size as the positive electrode layer 302 and the solid electrolyte layer 303.
- the negative electrode layer 304 is formed such that the outer peripheral end of the negative electrode layer 304 overlaps the outer peripheral end of the solid electrolyte layer 303.
- the negative electrode layer 304 is pressurized as necessary.
- a laminate 310 in which the positive electrode layer 302, the solid electrolyte layer 303, and the negative electrode layer 304 are stacked on the support plate 301 is produced (laminate formation step). Furthermore, a laminate in which the support plate 301, the positive electrode layer 302, the solid electrolyte layer 303, and the negative electrode layer 304 are firmly integrated by pressurizing the laminate 310 as described above (temporary pressurization and main pressurization). 310 is obtained.
- the outer peripheral end portion is cut off from the laminated body 310 with a cut-off outer shape 306 forming a square indicated by a two-dot chain line (cut-off step).
- Get The support plate 301 is removed from the laminate 311 to obtain laminates 12, 22, 32, 42, and 52.
- the cut-off portion may be divided into a plurality of portions along a dividing line L1 indicated by an alternate long and short dash line. Thereby, a plurality of divided laminates can be obtained.
- Such divided laminates may be used as the laminates 12, 22, 32, 42 and 52.
- the positive electrode layer 302 in the stacked body 310, the positive electrode layer 302, the solid electrolyte layer 303, and the negative electrode layer 304 are formed such that the overlapping interfaces of the respective layers have the same area.
- the powder may be broken at the end of the laminate 311 or the positive electrode layer may be formed due to alignment accuracy at the time of film formation of each layer, film formation accuracy, uneven pressing of the end and center, and the like.
- the possibility of short circuit between the positive electrode active material and the negative electrode active material forming the negative electrode layer increases.
- the peripheral portion of the laminated body 310 (portion outside the cut-off outer shape 306) is cut off.
- the positive electrode layer, the solid electrolyte layer, and the negative electrode layer are portions having a dense structure which is uniformly pressed and solidified by pressure, and the outer peripheral end portion is unlikely to be broken. Therefore, it is possible to prevent end collapse or short circuit at the outer peripheral end of the laminated body 311.
- the positive electrode layer 312 (first electrode layer) is formed into a square on the support plate 301 formed into a square using the apparatus shown in FIG. Form.
- the outer peripheral end of the positive electrode layer 312 is the outer peripheral end of the support plate 301 so that the positive electrode layer 312 forms a square smaller in area than the support plate 301 and smaller than the above-described positive electrode layer 312. It is formed so as to be at a predetermined width and at a position where it retreats inward.
- the positive electrode layer 312 is pressurized.
- the solid electrolyte layer 313 is formed on the positive electrode layer 312 in the same shape as the positive electrode layer 312 and larger than the positive electrode layer 312.
- the solid electrolyte layer 313 is formed so as to cover the whole of the positive electrode layer 312 by positioning the outer peripheral end of the solid electrolyte layer 313 outside the outer peripheral end of the positive electrode layer 302.
- the solid electrolyte layer 313 is pressurized as necessary.
- the negative electrode layer 314 is formed on the solid electrolyte layer 313 in the same planar shape and the same planar size as the solid electrolyte layer 303.
- the negative electrode layer 314 is formed such that the outer peripheral end of the negative electrode layer 314 overlaps the outer peripheral end of the solid electrolyte layer 313.
- the negative electrode layer 314 may be formed so that the outer peripheral end of the negative electrode layer 314 is located between the outer peripheral end of the positive electrode layer 312 and the outer peripheral end of the solid electrolyte layer 313 .
- the negative electrode layer 314 is pressurized.
- a laminate 320 in which the positive electrode layer 312, the solid electrolyte layer 313, and the negative electrode layer 314 are stacked on the support plate 301 is produced (laminate formation step). Furthermore, by pressing the laminate 320 as described above, a laminate 320 in which the support plate 301, the positive electrode layer 312, the solid electrolyte layer 313, and the negative electrode layer 314 are firmly integrated is obtained.
- the outer peripheral end portion is cut off from the laminated body 320 with a cut-off outer shape 316 forming a square indicated by a two-dot chain line (cut-off process).
- the cut-off outer shape 316 is located inside the outer peripheral end of each of the support plate 301, the solid electrolyte layer 313, and the negative electrode layer 314, and is located outside the outer peripheral end of the positive electrode layer 312 (a region without the positive electrode layer 312). doing.
- This laminate 321 is used as laminates 12, 22, 32, 42, 52 to which positive electrode current collectors 11, 21, 31, 41, 51 are attached, respectively.
- the cut-out portion may be divided into a plurality of portions along a dividing line L2 indicated by a dashed dotted line. Thereby, a plurality of divided laminates can be obtained.
- Such divided laminates may be used as the laminates 12, 22, 32, 42 and 52.
- the area of the upper surface of each layer is the smallest in the positive electrode layer and the largest in the solid electrolyte layer, or the smallest in the positive electrode layer, and the solid electrolyte layer and the negative electrode layer Are equal.
- the positive electrode layer is covered with the solid electrolyte layer on the cut-off surface. Therefore, the possibility of contact between the positive electrode active material of the positive electrode layer and the negative electrode active material of the negative electrode layer can be substantially eliminated. Therefore, the reliability of the stacked body 321 can be improved.
- the method for cutting off the outer peripheral end portions of the laminates 310 and 320 is not particularly limited. Cutting off the outer peripheral end from the laminates 310 and 320 is the simplest by punching as follows.
- the cutting is performed using a precision punching device 400 configured by the punch 401, the die 402 and the pressing plate 403.
- a punching die having a shape as shown in FIG. 5 punch 401, die 402, pressing plate 403, etc.
- laminates 311 and 321 are obtained from one laminate 310 and 320 by one-time punching. be able to.
- the conditions for punching depend on the material and thickness of the laminates 310 and 320 to be punched out, the pressure applied to the laminate, and the like.
- the clearance C between the punch 401 and the die 402 is preferably in the range of 0 to several hundreds ⁇ m, and the insertion speed V of the punch 401 is preferably in the range of several to several tens of mm / sec. If the clearance C is large, burrs are likely to occur, so the clearance C should be as small as possible. As the clearance C is smaller, the blade edge 401a of the punch 401 and the blade edge 402a of the die 402 are more easily damaged. In the present embodiment, the clearance C is 3 ⁇ m, and the insertion speed V of the punch 401 is 30 mm / sec.
- the die 402 is provided with a flank 402b.
- the relief angle ⁇ 1 forming the relief surface 402b is about several degrees.
- the flanks 402 b can prevent the cross sections of the stacked bodies 310 and 320 from being roughened at the inner peripheral wall of the die 402.
- the flank 402 may be formed from near the upper end to the lower end of the die 402. However, when the flank 402 is formed in this manner, the life of the die 402 is shortened. Therefore, in order to extend the life of the die 402, the flank 402 is preferably formed below the middle portion of the inner peripheral wall of the die 402, as shown in FIG. Further, the upper side of the inner peripheral wall of the die 402 above the middle portion is formed as a parallel surface substantially parallel to the outer peripheral wall of the punch 401.
- the punch 401 is driven so that the lower end surface of the punch 401 reaches below the lower end of the parallel surface at the lower dead center of the punch 401.
- the laminates 310 and 320 are very hard by pressure treatment and have sufficient strength to withstand punching by the punch 401.
- punching can be performed without providing the pressing plate 403.
- the punch 401, the die 402, and the like be provided with a short circuit preventive measure so that the punch 401 and the die 402 do not cause a short circuit at the time of punching.
- a short circuit preventive measure for example, the insulation of the pressure plate 403 and the coating on the surface of the punch 401 and the die 402 can be mentioned.
- the cutting may be performed using a Thomson blade or another blade, or may be performed using a laser, shearing, a cutting machine or the like as a means other than the blade.
- the outer peripheral end may be cut off from the laminates 310 and 320 by division by the chocolate breaking method.
- a cutting groove is provided on the surface of the support plate 301 of the laminate 310, 320 with a cutter blade or the like, and a dividing groove is provided on the outer shape 306, 316, and the laminate 310, 320 is bent by impact or bending. Add a moment. Thereby, the laminates 310 and 320 can be broken along the dividing grooves.
- the laminates 311 and 321 can be cut out in a desired shape.
- the laminated body 501 may be broken by applying a bending moment to both sides of the dividing groove 501a of the laminated body 501.
- a dividing groove 501a (groove) is formed on one surface of a support plate (for example, the above-described support plate 301) in the laminate 501. Therefore, the dividing groove 501a is not formed on the other surface of the support plate (a layer surface which is a portion of the interface between the support plate and the positive electrode layer or the negative electrode layer).
- a bending moment is applied to both sides of the dividing groove 501a in such a laminated body 501, and stress is concentrated on the dividing groove 501a, whereby the laminated body 501 is broken.
- the method of applying force is not limited to the above method, and any method may be used to apply force to the laminate 501 as long as bending stress, shear stress, or both act on the periphery of the dividing groove 51a. Absent.
- the laminate 501 may be broken in a state of being fixed by the first pressing plate 601 and the second pressing plate 602. Specifically, the laminated body 501 is sandwiched and fixed between the first pressing plate 601 and the second pressing plate 602 at a position spaced a predetermined distance on one side of the dividing groove 501a, and a predetermined distance on the other side of the dividing groove 501a. Apply a load at the place where it is set. Thereby, the laminate 501 is broken.
- the division groove 501a is not limited to a width of less than 1 mm and a total thickness of the laminate 501 although it depends on the material forming the laminate 501, the thickness of the laminate 501, the pressure applied at the time of molding of the laminate 501, and the like. It is preferable to have a depth of 10/10 or less.
- the dividing groove 501a may be provided by any method other than the notch by the cutter blade or the like as described above.
- the split groove 501a may be formed by pressing a mold having a convex portion that matches the shape of the split groove 501a against the laminate 501, or the split may be performed using a rotary blade (a blade is provided with a blade).
- the groove 501a may be formed.
- the dividing groove 501a may be provided on any surface of the positive electrode layer, the negative electrode layer, and the support plate (including the positive electrode current collector or the negative electrode current collector (positive electrode current collector foil or negative electrode current collector foil)). Absent. However, in the case where the dividing groove 501a is provided on the surface of the positive electrode current collector foil or the negative electrode current collector foil, it is preferable that the positive electrode layer or the negative electrode layer is in close contact with the current collector foil.
- laminates 12, 22, 32, 42, 42 are obtained.
- the end portions of these laminates 12, 22, 32, 42 and 52 are protected (coated) as necessary.
- the coating material needs to be selected according to the application of the battery to be manufactured, but basically, it should be selected from insulating materials such as photo-curing resin, thermosetting resin, two-component curing resin, rubber, silicone, ceramic, etc. Can.
- a photocurable resin is selected as a coating material that does not react with the solid electrolyte and cures as low as possible.
- the final product is a stack of a plurality of stacks 321 (when the capacity and output are insufficient for one cell)
- a plurality of stacks 321 are stacked and then an end protection structure is formed.
- a plurality of laminates 321 having a protective structure of the end may be stacked.
- the positive electrode current collectors 11, 21, 31, 41 and 51 and the negative electrode current collectors 13, 23, 33, 43 and 53 are respectively obtained in the laminates 12, 22, 32, 42 and 52 obtained through the above steps.
- all solid batteries 1 to 5 are further stacked and sealed in package 8 to complete all solid battery 101.
- the all solid battery 101 is an all solid lithium ion secondary battery.
- the all solid lithium ion secondary battery although voltage can be obtained without connecting a plurality of all solid batteries in series, a large current value can not be obtained without connecting the respective stacks in parallel. Therefore, in the example described below, as shown in FIG. 1, a structure in which all the solid batteries 1 to 5 are connected in parallel will be described.
- all solid batteries 1 to 5 positive electrode current collector, negative electrode current collector, and presence or absence of end coating in parallel
- all solid batteries 1 to 5 positive electrode current collector, negative electrode current collector, and presence or absence of end coating in parallel
- the all solid state battery 3 is disposed so as to have a negative electrode layer on the negative electrode side and a positive electrode layer on the positive electrode side.
- positive electrode current collectors 61 to 63 are disposed in appropriate positions and at least partially in contact with respective positive electrode layers of all the solid batteries 1 to 5.
- negative electrode current collectors 71 to 73 are disposed in appropriate positions and at least partially in contact with the respective negative electrode layers of all the solid batteries 1 to 5. Specifically, the negative electrode current collector 71 is disposed at a position contacting the negative electrode layer of the all solid battery 1, and the negative electrode current collector 72 is disposed at a position contacting the respective negative electrode layers of the all solid batteries 2 and 3.
- the negative electrode current collector 73 is disposed at a position in contact with the negative electrode layer of each of all the solid batteries 4 and 5.
- the positive electrode current collector 61 is disposed at a position contacting the positive electrode layer of the all solid battery 5
- the positive electrode current collector 62 is disposed at a position contacting the respective positive electrode layers of the all solid batteries 4
- the positive electrode current collector 63 is disposed at a position in contact with the respective positive electrode layers of the batteries 2 and 1.
- connection between positive electrode current collectors 61 to 63 and negative electrode current collectors 71 to 73, connection between positive electrode current collectors 61 to 63 and positive electrode terminal 60, and connection between negative electrode current collectors 71 to 73 and negative electrode terminal 70 can use welding techniques such as ultrasonic welding, resistance welding, laser welding. However, these connections may be made not only by the welding technique but also by other methods. For example, if the contact resistance can be sufficiently reduced, adhesion with a conductive adhesive, physical contact such as caulking or screwing alone does not matter.
- the support plate 301 of the laminates 310 and 320 is the positive electrode current collectors 11, 21, 31, 41 and 51
- one of the positive electrode current collectors 11, 21, 31 and 41 is It may be used also as the conductors 61 to 63.
- the positive electrode current collectors 61 to 63 are formed integrally with the positive electrode current collectors 51, 31 and 11, respectively.
- the all solid battery 4 is disposed such that the positive electrode current collector 41 contacts the positive electrode current collector 31 which also serves as the positive electrode current collector 62, and the positive electrode current collector 21 also serves as the positive electrode current collector 63.
- All solid state battery 2 is arranged to be in contact with body 11.
- the positive electrode current collectors 61 to 63 are formed integrally with the positive electrode current collectors 51, 41, and 21, respectively.
- the all solid battery 3 is disposed such that the positive electrode current collector 31 contacts the positive electrode current collector 41 which also serves as the positive electrode current collector 62, and the positive electrode current collector 11 also serves as the positive electrode current collector 63.
- All solid state battery 1 is arranged to be in contact with body 21.
- the support plate 301 is connected to the positive electrode terminal 60 in cutting off the outer peripheral end from the laminates 310 and 320 described above. It is necessary to leave the connection without cutting it off.
- the positive electrode current collector does not have the above connection portion, it is necessary to electrically connect the positive electrode current collector and the positive electrode terminal 60 with any connection member.
- the manufacturing method of the all-solid-state battery 101 which concerns on this embodiment is a laminated body which forms the laminated body containing a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between a positive electrode layer and a negative electrode layer. It includes a forming step and a cutting-off step of forming a laminated body including a powder material by cutting off the outer peripheral end of the laminated body.
- the laminate can remove the outer peripheral end that is easily broken by the alignment accuracy at the time of film formation of each layer, the film forming accuracy, and the uneven pressure at the end and center, and thus a new outer periphery that is not easily broken.
- the end can be obtained. Therefore, a short circuit between the electrodes due to the collapse of the outer peripheral end can be prevented.
- the above-described manufacturing method may further include a pressing step of pressing the laminate.
- a pressing step of pressing the laminate may be made uniform throughout.
- the outer peripheral end of the laminate may be cut off with a blade or a die. Thereby, the outer peripheral end can be cut off at one time. Therefore, the trimming can be performed efficiently.
- the laminate a groove is formed on one surface, and a support plate (support plate 301) in which the layer surface of the laminate (a part of an interface between the laminate and the support plate) is in contact with the other surface.
- the laminate may be divided by a chocolate breaking method.
- the laminate can be easily divided along the grooves of the support plate. Therefore, the outer peripheral end can be cut out without using a large-scale device.
- cutting-off of the outer peripheral end and division into a plurality of portions of the laminate may be simultaneously performed. Thereby, a plurality of divided laminates can be obtained simultaneously with cutting off the outer peripheral end. Therefore, a plurality of batteries can be easily manufactured.
- FIG. 8 is a cross-sectional view showing the structure of an all-solid-state battery 102 according to a comparative example of the present embodiment.
- Example 1 an all-solid battery 101 manufactured by the first manufacturing method using the laminate 310 will be described.
- the positive electrode layer 302, the solid electrolyte layer 303, and the negative electrode layer 304 were formed such that the area of the interface between the layers was the same.
- the outer peripheral end of the laminated body 310 is cut off. Therefore, it is not necessary to limit the size and shape of these three layers.
- the positive electrode layer 302, the solid electrolyte layer 303, and the negative electrode layer 304 are formed in this order as a powder layer on the positive electrode current collector as the support plate 301.
- the method of forming the powder layer is as described above.
- the negative electrode current collector may be placed (or integrated) on the negative electrode layer 304.
- Unnecessary support plate 301 (current collector) can be removed by cutting off. Therefore, a large support plate 301 can be used to facilitate handling of the support plate 301 to improve manufacturing reliability.
- the obtained laminate 311 has a square shape with an outer size of 50 mm ⁇ 50 mm, and has an effective area ratio (chargeable / dischargeable area ratio) of 100%.
- the external dimensions of the all-solid-state battery 101 including the package 8 were 55 mm ⁇ 55 mm ⁇ 2.5 mm, and the weight of the all-solid-state battery 101 was about 10 g.
- inside the package 8 there is no unnecessary insulator or the like for preventing an end short circuit other than that the inside of the package is insulated.
- Example 2 In the present embodiment, an all-solid battery 101 manufactured by the second manufacturing method using the laminate 320 will be described.
- the positive electrode layer 312 (or the negative electrode layer 304) is formed the smallest, and the solid electrolyte layer 313 is formed to cover the upper surface and the side surface. It formed.
- the screen 201 for forming a covering portion covering the side surface of the positive electrode layer 312 in the solid electrolyte layer 313 is used. The process of forming a coating part was added. However, the method of obtaining this configuration is not limited to this, and any other method may be used.
- the laminate 320 was produced such that the area of the upper surface of the positive electrode layer 312 was the smallest and the area of the upper surface of the solid electrolyte layer 313 was the largest.
- a laminate 320 was also produced so that the area of the top surface of the positive electrode layer 312 is the smallest, and the area of the top surfaces of the solid electrolyte layer 313 and the negative electrode layer 314 is the largest.
- the outer peripheral end was cut off at a place where the positive electrode layer 312 does not exist (here, a place where only the solid electrolyte layer 313 and the negative electrode layer 314 exist on the support plate 301).
- the possibility of the positive electrode active material and the negative electrode active material coming into contact with each other due to shearing of the cut-off can be substantially eliminated.
- the unnecessary support plate 301 (current collector) can be removed by cutting off. Therefore, a large support plate 301 can be used to facilitate handling of the support plate 301 to improve manufacturing reliability.
- the obtained laminated body 321 has a square of 50 mm ⁇ 50 mm in outer diameter, and has a portion without a positive electrode layer in a slight range of the peripheral portion, and thus has an effective area ratio of 96% (49 mm ⁇ 49 mm).
- the external dimensions of the all-solid-state battery 101 including the package 8 are 55 mm ⁇ 55 mm ⁇ 2.5 mm.
- the weight of the all-solid-state battery 101 was about 10 g.
- inside the package 8 there is no unnecessary insulator or the like for preventing an end short circuit other than that the inside of the package is insulated.
- Comparative Example As a comparative example, the all-solid-state battery 102 manufactured by the conventional manufacturing method is demonstrated.
- the all-solid battery 102 includes all-solid batteries 1A to 5A, a positive electrode current collector 6, a negative electrode current collector 7, and a package 8.
- the all solid batteries 1A to 5A are arranged in order of the all solid battery 1A, the all solid battery 22A, the all solid battery 3A, the all solid battery 4A and the all solid battery 5A from the negative electrode side.
- the all solid battery 1A is configured by laminating the positive electrode current collector 111, the laminate 12, and the negative electrode current collector 113 in this order.
- the all-solid battery 2A is configured by stacking the positive electrode current collector 121, the laminate 22, and the negative electrode current collector 123 in this order.
- the all-solid battery 3A is configured by laminating a positive electrode current collector 131, a laminate 32, and a negative electrode current collector 133 in this order.
- the all-solid battery 4A is configured by laminating the positive electrode current collector 141, the laminate 42, and the negative electrode current collector 143 in this order.
- the all-solid-state battery 5A is configured by stacking the positive electrode current collector 151, the laminate 52, and the negative electrode current collector 153 in this order.
- the positive electrode current collectors 111, 121, 131, 141, 151 and the negative electrode current collectors 113, 123, 133, 143, 153 have wider interface areas than the laminates 12, 22, 32, 42, 42, respectively. It is formed.
- the positive electrode current collectors 111, 121, 131, 141, 151 and the negative electrode current collectors 113, 123, 133, 143, 153 have outer peripheral ends corresponding to the outer peripheral ends of the laminates 12, 22, 32, 42, 42, respectively. It is arranged to project further outward.
- the outer peripheral end is cut off from the state of the laminate, and the all-solid-state batteries 1A to 5A are not manufactured.
- the external shapes of the positive electrode current collectors 111, 121, 131, 141, 151 and the negative electrode current collectors 113, 123, 133, 143, 153 are the same as those of the positive electrode current collectors 11, 21, 21, 31 of Examples 1 and 2. 41 and 51 and the external shape of the negative electrode current collectors 13, 23, 33, 43 and 53.
- the external shape of the obtained all solid batteries 1A to 5A is 51 mm ⁇ 51 mm, and there is a portion without the positive electrode layer in a slight range of the peripheral portion, so the effective area ratio (chargeable / dischargeable area ratio) is 92% (49 mm) ⁇ 49 mm).
- the all solid battery 102 since the current collector is not cut off, packaging the all solid batteries 1A to 5A while leaving an insulator (not shown) for preventing end collapse, handling allowance, etc. Must-have. Therefore, the external dimensions of the all-solid battery 102 including the package 8 were 66 mm ⁇ 66 mm ⁇ 2.5 mm, and the weight of the all-solid battery 102 was about 15 g. Moreover, in order to improve the non-defective rate, the current collector can be enlarged, and the handling property can be slightly improved. On the other hand, the package volume and weight are increased, and the energy density is further reduced.
- the all-solid-state battery 101 according to Examples 1 and 2 has a smaller volume of the package 8 and a lighter battery weight than the all-solid-state battery 102 according to the comparative example. Therefore, the energy density per volume and weight is also greater in the first and second embodiments.
- the non-defective rate was as low as 65% because the powder layer is likely to have uneven density due to edge collapse, short circuit at the edge, and in-plane pressure unevenness.
- the non-defective rate of the all-solid-state battery 101 according to the first embodiment is 85%
- the non-defective rate of the all-solid-state battery 101 according to the second embodiment is 90%.
- the volume (insulator, end without electrode layer, sealing portion, etc.) that does not contribute to charge / discharge in the final product (battery) is It gets bigger. This makes it difficult to produce a battery with high energy density or power density per weight or volume.
- the yield does not decrease due to a short circuit at the end of the electrode layer (positive electrode layer, negative electrode layer), and the weight per unit volume or volume It is possible to manufacture batteries with high energy density or power density.
- FIG. 9 is a cross-sectional view showing the structure of the all-solid-state battery 90 according to the second embodiment.
- a negative electrode current collector 91 support plate
- a negative electrode layer 92 negative electrode layer
- a solid electrolyte layer 93 solid electrolyte layer
- a positive electrode layer 94 positive electrode current collector 95
- the negative electrode current collector 91 is formed of the same material as the material forming the negative electrode current collectors 71 to 73 in the all-solid-state battery 101 of the first embodiment.
- the positive electrode current collector 95 is formed of the same material as the material forming the positive electrode current collectors 61 to 63 of the all solid state battery 101.
- the positive electrode layer 94 (first electrode layer) is formed of the same material as the material forming the positive electrode layer of the all-solid-state battery 101.
- the negative electrode layer 92 (second electrode layer) has the polarity opposite to that of the positive electrode layer 94, and is formed of the same material as the material forming the negative electrode layer of the all-solid battery 101.
- the solid electrolyte layer 93 is interposed between the negative electrode layer 92 and the positive electrode layer 94, and is formed of the same material as the material forming the solid electrolyte layer of the all-solid battery 101.
- Each of the positive electrode layer 94, the solid electrolyte layer 93, and the negative electrode layer 92 has an upper surface and a lower surface.
- the area of the upper surface of each of the positive electrode current collector 95, the positive electrode layer 94, the solid electrolyte layer 93, the negative electrode layer 92, and the negative electrode current collector 91 becomes larger.
- the area of the interface between the lower surface of the positive electrode layer 94 and the upper surface of the solid electrolyte layer 93 is smaller than the area of the interface between the lower surface of the solid electrolyte layer 93 and the upper surface of the negative electrode layer 92.
- the side surfaces of the all-solid-state battery 90 form a single flat surface that slopes continuously throughout.
- the side surface of the all-solid-state battery 90 may be continuously inclined, and may form a curved surface (convex or concave).
- the side surface of the all solid battery 90 formed in a convex shape is less likely to cause end collapse.
- the form of the inclination of the side of the all-solid-state battery 90 it is not limited to the form by which a single flat surface (inclined surface) as shown in FIG. 9 is formed in the whole.
- a plurality of inclined surfaces having different inclination angles may be continuously formed on the entire side surface.
- the inclination angle of each inclined surface is not limited to a specific angle, and can be set according to various factors.
- the position of the boundary between adjacent inclined surfaces may be located at any position on the side surface.
- the side surface may be inclined in a curved shape.
- the curved surface shape is not limited to a specific shape, and may be the above-mentioned curved shape or the like.
- an inclined surface may be formed on part of the side surface.
- the range in which the inclined surface is formed is not limited to a specific range, and may be an intermediate portion of the side surface, or both end sides of the side surface, or both ends It may be one of the two sides. It can be said that such side surfaces are also inclined.
- the side surface formed in the various forms as described above cuts off the outer peripheral end of the all solid battery 190 with a blade having an inner shape corresponding to the shape of the side surface Obtained by In other words, by designing the shape of the blade, it is possible to obtain the side of the desired shape. For example, when forming the above-mentioned multistage inclined surface in a side, it cuts off using a blade which has a plurality of inclined surfaces corresponding to each inclined surface of a multistage inclined surface inside.
- FIG. 10 is a cross-sectional view of all-solid battery 190 showing a cutting-off step in the manufacture of all-solid battery 90.
- a laminate is prepared in the same manner as in the method of producing the laminates 310 and 320 described with reference to FIGS. 3 and 4 in Embodiment 1, and further, the negative electrode current collector 91 and the positive electrode current collector 95 are prepared.
- an all solid battery 190 shown in FIG. 10 is produced (laminate forming step).
- a negative electrode layer 92, a solid electrolyte layer 93, a positive electrode layer 94, and a positive electrode current collector 95 are sequentially stacked on the negative electrode current collector 91 to obtain an all-solid battery 190.
- each layer is pressurized in the formation step.
- a three-layered laminate composed of the negative electrode layer 92, the solid electrolyte layer 93, and the positive electrode layer 94 is formed, and after pressing this laminated body, the laminate is disposed on the negative electrode current collector 91, and The positive electrode current collector 95 may be formed.
- the outer peripheral end of the all solid battery 190 including the laminate is cut off (cut-off process).
- cut-off process by pressing the powder layer substantially uniformly, it is possible to obtain an all solid battery 90 which is uniform to the end.
- insulators such as resin, rubber, and ceramic.
- the above-mentioned trimming is performed using a precision punching device having a punch 701 and a die 702.
- a punching die having a shape as shown in FIG. 10 it is possible to obtain an all-solid battery 90 from one all-solid battery 190 by one-time punching.
- the blade 701a of the punch 701 has the inner blade which becomes thin at least inside toward a blade edge, you may have a double-edged blade.
- By performing cutting off using such a punch 701 it is possible to obtain an all-solid-state battery 90 whose side faces are inclined on both sides of the blade. Therefore, division at the dividing lines L1 and L2 shown in (d) of FIG. 3 and (d) of FIG. 4 can be easily realized.
- the all solid battery 190 can be cut so that the cut surface of the all solid battery 90 may be inclined as shown in FIG. 10, a blade other than the punch 701 or a laser may be used.
- the positive electrode layer 94 is smaller than the negative electrode layer 92, and both the positive electrode layer 94 and the negative electrode layer 92 are not constant in the thickness direction.
- the area of the negative electrode layer is generally larger than that of the positive electrode layer.
- the side of the all-solid-state battery 90 according to this embodiment is inclined. Thereby, the part which each layer protrudes does not arise in the outer peripheral end surface of a laminated body. Thus, it is possible to avoid a short circuit between the positive electrode layer and the negative electrode layer due to the collapse of the protruding portions of the positive electrode layer and the negative electrode layer as in the conventional all solid battery in which the positive electrode layer and the negative electrode layer are stacked one by one. .
- the area of the upper surface of the negative electrode layer 92 is larger than the area of the upper surface of the positive electrode layer 94 in the present embodiment, the area of the upper surface of the positive electrode layer 94 may be larger than the area of the upper surface of the negative electrode layer 92.
- FIG. 11 is a cross-sectional view showing the structure of the all-solid-state battery 800 according to the fourth embodiment.
- the all solid battery 800 has a structure in which a positive electrode current collector 801, a positive electrode layer 802, a solid electrolyte layer 803, a negative electrode layer 804, and a negative electrode current collector 805 are stacked in this order. have.
- the positive electrode layer 802, the solid electrolyte layer 803 and the negative electrode layer 804 form a laminate 806 in the all-solid battery 800.
- the positive electrode current collector 801 is formed of the same material as the material forming the positive electrode current collectors 61 to 63 of the all solid state battery 101.
- the negative electrode current collector 805 is formed of the same material as the material forming the negative electrode current collectors 71 to 73 in the all-solid-state battery 101 of the first embodiment.
- the positive electrode layer 802 (first electrode layer) is formed of the same material as the material forming the positive electrode layer of the all-solid-state battery 101.
- the negative electrode layer 804 (second electrode layer) has the opposite polarity to the positive electrode layer 802, and is formed of the same material as the material forming the negative electrode layer of the all-solid battery 101.
- the solid electrolyte layer 803 is interposed between the positive electrode layer 802 and the negative electrode layer 804, and is formed of the same material as the material forming the solid electrolyte layer of the all-solid battery 101.
- FIG. 12 is a plan view showing the structure before the outer peripheral end of the all-solid-state battery 800 is cut off.
- FIG. 13 is a cross-sectional view taken along line AA of FIG.
- an insulating member 807 having an opening 807a is disposed on a square positive electrode current collector 801 in a region where the laminate 806 can be formed, and a lower adhesive layer 808 is formed. Glue by. Insulating member 807 is formed to form a square having an area smaller than that of positive electrode current collector 801, and the outer peripheral end of insulating member 807 is inward from the outer peripheral end of positive electrode current collector 801 by a predetermined width. It is arranged to be in the retreated position. Further, the inner peripheral end portion forming the opening 807a is formed thicker than the portion formed in the plate shape on the outer peripheral side than that.
- a stack 805 is formed in the region of the opening 807a of the insulating member 807 on the surface of the positive electrode current collector 801 using the device shown in FIG.
- the positive electrode layer 802 is formed on the positive electrode current collector 801.
- the positive electrode layer 802 is pressurized.
- a solid electrolyte layer 803 is formed on the positive electrode layer 802 so as to cover the surface of the positive electrode layer 802 and to cover the inner circumferential surface and the upper surface of the insulating member 807.
- the solid electrolyte layer 803 is pressurized.
- the negative electrode layer 804 is formed on the solid electrolyte layer 803. In addition, the negative electrode layer 804 is pressurized as necessary.
- the negative electrode current collector 805 in which the upper adhesive layer 809 is formed is disposed on the negative electrode layer 804, and is adhered to the plate-like portion of the insulating member 807 by the upper adhesive layer 809.
- the negative electrode current collector 805 is temporarily pressurized at a low pressure. After that, main suction is performed at high pressure while suctioning internal air.
- an all-solid battery 810 is produced in which the positive electrode layer 802, the solid electrolyte layer 803, and the negative electrode layer 804 are stacked on the positive electrode current collector 801, and the negative electrode current collector 805 is formed Process).
- the negative electrode current collector 805 is omitted so that the lower layer structure of the negative electrode current collector 805 can be understood.
- the outer peripheral end including the insulating member 807 not only does not contribute to charge and discharge, but the thickness is different from the central part and may not be sufficiently compressed and may be fragile. Therefore, the outer peripheral end is cut off using the precision punching device shown in FIG.
- the outer peripheral end is cut off in a state in which the rigidity of the portion inside the outer peripheral end to be cut off is higher than the rigidity of the outer peripheral end.
- the outer peripheral end can be made more brittle than the all solid battery 800 cut out from the all solid battery 810, and the distortion of the laminate 805 generated at the time of cutting off the outer peripheral end can be absorbed in the outer peripheral end.
- the high rigidity member is cut off prior to cutting off the outer peripheral end. Specifically, the portion including the majority of the rigid insulating member 807 (high rigidity member) included in the outer peripheral end around the all solid battery 800 is cut off at the cut-off point C1.
- the outer shape of the peripheral portion that is, the shape of the outer periphery of the laminated body 805 is formed so as to be equal to or less than the area of the (inner portion).
- the laminate 805 is formed such that the area of the peripheral portion is 2500 mm 2 or less, that is, the peripheral outline has a size of at least 70.7 mm square. Is desirable.
- the peripheral part In a layer formed of the same material as in the laminate 805 and pressed under the same pressure, when the area of the peripheral part is larger than the area of the inner part, the peripheral part does not become brittle when cut off. Therefore, it is difficult for the distortion generated in the inner part to escape to the surrounding part.
- the outer peripheral shape of the laminated body 805 is formed with respect to the position of the cut-off point C2 such that the area of the outer peripheral portion is equal to or less than the area of the inner portion.
- the powder material forming the laminate 805 is compacted in the all-solid-state battery 800, it has the property of being more easily broken when the blade is inserted, as compared to a metal material. In addition, since the bonding between the fine powders is not as strong as metal bonding, they are easily broken when an impact is applied by rapid processing.
- the laminate 805 can be sheared so as to be divided gently without applying an impact that breaks the laminate 805 made of the powder material.
- the cutting speed is 50 mm / sec or less, the collapse of the laminate 805 due to the cutting can be substantially suppressed.
- Embodiment 4 The fourth embodiment of the present invention is described below with reference to FIG. 2, FIG. 10, and FIG. 14 to FIG.
- components having the same functions as the components in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.
- FIG. 14 is a plan view showing the structure of the all-solid-state battery 900 according to the fourth embodiment.
- the all solid battery 900 has a structure in which a positive electrode current collector 901, a positive electrode layer 902, a solid electrolyte layer 903, a negative electrode layer 904, and a negative electrode current collector 905 are stacked in this order. have.
- the positive electrode layer 902, the solid electrolyte layer 903 and the negative electrode layer 904 form a laminate 906 in the all-solid battery 900.
- the positive electrode current collector 901 is formed of the same material as the material forming the positive electrode current collectors 61 to 63 of the all solid state battery 101.
- the negative electrode current collector 905 is formed of the same material as the material forming the negative electrode current collectors 71 to 73 in the all-solid-state battery 101 of the first embodiment.
- the positive electrode layer 902 (first electrode layer) is formed of the same material as the material forming the positive electrode layer of the all-solid-state battery 101.
- the negative electrode layer 904 (second electrode layer) has the polarity opposite to that of the positive electrode layer 902, and is formed of the same material as the material forming the negative electrode layer of the all-solid battery 101.
- the solid electrolyte layer 903 is interposed between the positive electrode layer 902 and the negative electrode layer 904, and is formed of the same material as the material forming the solid electrolyte layer of the all-solid battery 101.
- the solid electrolyte layer 903 is formed as an undulating film having an undulation (relief). Specifically, the solid electrolyte layer 903 has a thick film portion 903a formed thick in the outer peripheral portion and a thin film portion 903b formed inside the thick film portion 903a.
- the thicknesses of the positive electrode layer 902, the solid electrolyte layer 903 and the negative electrode layer 904 are all 100 ⁇ m, and the laminate 905 is formed in a flat plate shape having a uniform thickness of 300 ⁇ m.
- the stack 905 In order for the stack 905 to have such a shape and the solid electrolyte layer 903 to have a waviness, the following equation needs to be satisfied.
- Wp-Wv / T 0.1 to 2.0 [ ⁇ m]
- Wp represents the maximum height with respect to the reference position which is the average film thickness of the solid electrolyte layer 903 of the thick film portion 903a
- Wv represents the maximum height with respect to the above reference position
- T represents the average film thickness ( ⁇ m) of the solid electrolyte layer 903.
- the Wp-Wv of any one of the positive electrode layer 902, the solid electrolyte layer 903 and the negative electrode layer 904 is 200 ⁇ m, the Wp-Wv substantially reaches the maximum value for the laminate 905 to be flat.
- the positive electrode layer 902 or the negative electrode layer 904 may have undulation.
- the stack 906 at least one of the positive electrode layer 902, the solid electrolyte layer 903, and the negative electrode layer 904 may have an undulation.
- the laminate 906 needs to be formed in a flat plate shape having a uniform thickness.
- FIG. 15 is a plan view showing a structure before all solid state battery 100 is cut out from all solid state battery 910.
- FIG. 16 is a plan view showing the structure of the screen 201 used in the apparatus shown in FIG. 2 for producing the laminate included in the all-solid battery 910 shown in FIG.
- the positive electrode layer 902, the solid electrolyte layer 903 and the negative electrode layer 904 are formed on the square positive electrode current collector 901 using the apparatus shown in FIG. First, the positive electrode layer 902 of the positive electrode current collector 901 is formed. Here, if necessary, the positive electrode layer 902 is pressurized.
- a solid electrolyte layer 903 is formed on the positive electrode layer 902.
- the solid electrolyte layer 803 is pressurized.
- the screen 201 shown in FIG. 16 is used to form the solid electrolyte layer 903.
- the screen 201 has a screen frame 201a forming a square.
- the unopened part 201b which does not make powder material fall is formed inside the screen frame 201a, and the opening parts 201c and 201d are further formed inside the unopened part 201b.
- a plurality of square openings 201d are arranged in the square openings 201c (three rows and three columns in the example shown in FIG. 16).
- the openings 201 c and 201 d are formed by the aforementioned mesh in order to drop the powder material.
- the opening 201c is provided to form the thick film portion 903a, has a small mesh number, and has a large opening.
- the opening 201d is provided to form the thin film portion 903b, and has a large number of meshes and a small opening.
- the opening 201c the opening 104 ⁇ m, the mesh number 190 / inch, the wire diameter 29 ⁇ m, and the opening ratio 61.1% are preferable.
- the opening 201d it is preferable that the opening 55 ⁇ m, the mesh number 302 / inch, the wire diameter 29 ⁇ m, and the aperture ratio 42.9%. Note that these values are just an example.
- the screen 201 configured such that the amount by which the powder material is dropped varies depending on the portion is used. As a result, a large amount of powder material falls in the region between the outer peripheral region of the opening 201c and the adjacent opening 201d, while a small amount of powder material falls in the opening 201d.
- thick film portions 903 a and thin film portions 903 b are alternately formed.
- the negative electrode layer 904 is formed on the solid electrolyte layer 903. In addition, the negative electrode layer 904 is pressurized as necessary.
- the negative electrode current collector 905 is formed over the negative electrode layer 904. After the negative electrode current collector 905 is temporarily pressurized at low pressure, main pressurization is performed at high pressure.
- This all solid state battery 910 includes a plurality of all solid state batteries 900.
- the outer peripheral end of the all-solid-state battery 910 is cut off at a cut-off point C forming a square (cut-off step). Further, in this cutting-off step, the cut-off portion C forming a square may be divided into a plurality of parts along a dividing line (for example, a dividing line L1 as shown in (d) of FIG. . Thereby, a plurality of single all solid batteries 900 are obtained as a divided laminate.
- a dividing line for example, a dividing line L1 as shown in (d) of FIG.
- the solid electrolyte layer is thin. Therefore, when cutting out a plurality of all solid batteries, deformation of the cutting surface occurs due to shear force or the like, and the positive electrode layer and the negative electrode layer exceed the solid electrolyte layer. could short circuit. In addition, when an impact or vibration is applied to the all solid battery as a product, a short circuit between the positive electrode layer and the negative electrode layer occurs because the solid electrolyte layer is thin, particularly at the end where each layer tends to collapse particularly in the laminate. There was a fear.
- the average film thickness of the solid electrolyte layer 903 is thicker than the average film thickness of the solid electrolyte layer 903 in the cut-off portion C and dividing line in the all-solid battery 910 A thick film portion 903a is formed. Further, a thin film portion 903 b thinner than the average film thickness of the solid electrolyte layer 903 is formed inside the thick film portion 903 a formed on the outer peripheral portion of the solid electrolyte layer 903.
- the thickness of the outer peripheral portion (thick film portion 903b) of the solid electrolyte layer 903 in the all-solid-state battery 900 is larger than the thickness of the central portion (thin film portion 903b).
- the solid electrolyte layer 903 has the thick film portion 903a at the end of the all solid battery 900 where the laminate 906 easily collapses, so that even if shock or vibration is applied to the all solid battery 900 as a product, the positive electrode layer 902 and The possibility of a short circuit with the negative electrode layer 904 can be reduced.
- Electrodeposition occurs by eliminating the When electrodeposition occurs, not only the battery characteristics deteriorate, but also there is a possibility that the positive electrode and the negative electrode may be minutely short-circuited through the electrodeposition site.
- the mass of the negative electrode active material is larger than the mass of the positive electrode active material at any portion on the plane of the all-solid battery 900.
- the mass of the negative electrode active material facing the positive electrode active material can be increased. Therefore, the occurrence of electrodeposition can be suppressed.
- a precision punching apparatus suitable for punching a laminate having brittleness will be described.
- a conventional precision punching device using a mold will be described.
- FIG. 19 is a view showing a precision punching device 410 according to a comparative example of the fifth embodiment.
- the conventional precision punching apparatus 410 holds a punch 411 and a die 412 arranged to secure an appropriate clearance C, and a presser that holds the workpiece 450 on the die 413. And a plate 413.
- the precision punching device 410 cuts the plate-like workpiece 450 disposed between the punch 411 and the die 412 by shear deformation in the vicinity of the area of the clearance C by lowering the punch 411.
- the clearance C and fixation of the workpiece 450 by the pressing plate 413 are essential in order to punch the workpiece 450 precisely.
- whether the clearance C is appropriate or not is determined to determine the success or failure of the shearing operation.
- the clearance C is small, the punching cross section of the workpiece 450 is sharpened.
- the clearance C is large, the bending force (deformation) becomes larger than the shear force (cutting), so that sagging or burring occurs.
- the pressing plate 413 is required to suppress deformation such as bending of the workpiece 450 toward the punch 411 before the workpiece 450 is cut by shearing.
- the punching accuracy is improved by increasing the lowering speed (processing speed) of the punch 411.
- the conventional precision punching apparatus 410 properly selects the workpiece 450. I can not punch out.
- the clearance C is not very important, and there is no need to suppress the deformation of the workpiece 450 by the pressing plate 413. Rather, since the pressing plate 413 suppresses the gentle deformation of the workpiece 450, a load is applied only to the vicinity of the clearance C in the workpiece 450, and the portion of the clearance C is broken. Further, when the processing speed is increased, the workpiece 450 is easily broken by the impact of the punch 411.
- the punch surface of the punch 411 is formed to be a surface perpendicular to the tool axis (the central axis of the punch 411), while the workpiece 450 is a die Tilt and place on the 412.
- a shearing angle is provided on the mounting surface (upper end surface) of the die 412 on which the workpiece 450 is mounted.
- a line load can be converted to a point load.
- the reason why the shear angle is provided not on the side of the punch 411 but on the side of the die 412 is that when the side of the punch 411 is inclined, deformation such as warping occurs in the punched workpiece 450.
- FIG. 17 is a view showing a precision punching device 400A according to the fifth embodiment.
- the precision punching device 400A (processing device) includes a punch 404 and a die 402.
- the die 402 is also included in the precision punching device 400 in the first embodiment described above, and has a cutting edge 402a (blade) and a flank surface 402b on the inner peripheral wall forming a space into which the punch 404 is inserted. .
- the punch 404 has a shear angle so as to be inclined with respect to the tool axis (the central axis of the punch 404).
- the upper end surface of the die 402 may have a shear angle in the same manner as the upper end surface of the die 412 of the precision punching device 410 described above has a shear angle instead of the punch 404 having a shear angle.
- both die 402 and punch 404 may have shear angles.
- the punch 404 preferably has a shear angle. That is, it is preferable that a shear angle be provided between the upper end surface of the die 402 and the punch surface of the punch 404 (the lower end surface having the blade in the punch 404) regardless of any of outline extraction and drilling. Thereby, the punching thrust can be reduced, and the punching accuracy can be improved.
- the clearance C between the die 402 and the punch 404 does not have to be strictly defined, and is set to several to several tens of ⁇ m.
- the precision punching device 400A may include an attached peripheral device 406.
- the peripheral device 406 includes a removal mechanism, a cleaning mechanism, a transport mechanism, a positioning mechanism, and the like.
- the removal mechanism is a mechanism for scraping off the remaining matter remaining on the punch 404.
- the cleaning mechanism is a mechanism for cleaning the fine powder generated by the punching of the workpiece 450.
- the transport mechanism transports the workpiece 450 to the die 402 and transports the punched workpiece 450 on the die 402 to an apparatus of another process.
- the positioning mechanism is a mechanism for positioning the workpiece 450 at a predetermined processing position on the die 402.
- the workpiece 450 here is, for example, a sheet-like material including a brittle material, such as the laminates 310 and 320 punched out by the precision punching device 400 in the first embodiment.
- the workpiece 450 is freely supported on the die 402.
- the workpiece 450 may be loosely supported by a pressing plate (not shown) to such an extent that deformation occurring at the time of punching is not suppressed. That is, the die 402 is held so as not to suppress the deformation of the workpiece 450 for punching by the punch 404.
- the insertion speed V of the punch 404 is 100 mm / sec or less, preferably 50 mm / sec or less, more preferably 25 mm / sec or less.
- the workpiece 450 is punched in a range slightly larger than a desired punching size (product size), and the punched workpiece 450 is further punched into a desired punching size.
- a desired punching size product size
- the brittle material can be punched with higher accuracy by performing punching a plurality of times.
- the outer peripheral edge cut off from that portion rather than the rigidity of the cut portion. Cut out with low rigidity of the part. Thereby, the distortion produced at the time of cutting out can be absorbed at the outer peripheral end, and the product can be prevented from being damaged or defective.
- the outer peripheral end of the sheet containing a brittle material tends to be structurally unstable. For this reason, when a sheet slightly larger (about several mm) than the cut-out shape of the product is manufactured, the outer peripheral end of the cut-out product portion also becomes unstable. Therefore, a stable product can be obtained by forming a sheet with a relatively large area and cutting out only the structurally stable sheet central portion.
- the sheet is punched slightly larger than the product, and the punched sheet is punched into a product shape.
- FIG. 18 is a view showing another precision punching device 400B according to the fifth embodiment.
- the precision punching device 400 B (processing device) includes a punch 404 and a die 405.
- the die 405 has an upper blade 405a, a middle blade 405b, and a lower blade 405c as a plurality of blades on the inner peripheral wall.
- the upper blade 405a is provided on the upper end surface of the die 405 located at the uppermost position.
- the middle blade 405b is provided below the upper blade 405a.
- the middle blade 405b protrudes by a protrusion amount D1 toward the center of the die 405 than the upper blade 405a.
- the lower blade 405c is provided below the middle step 405b.
- the lower blade 405c protrudes with a protrusion amount D2 toward the center of the die 405 than the middle blade 405b.
- the amount of protrusion D1, D2 is on the order of sub-mm to several tens of mm, and more preferably 0.3 to 0.5 mm.
- the opening area of the upper blade 405a is the largest
- the opening area of the middle step 405b is the second largest
- the opening area of the lower blade 405c is the smallest.
- the opening area is formed to be smaller as it is positioned downward from the upper end surface of the die 405.
- the shapes of the upper blade 405a, the middle blade 405b and the lower blade 405c are basically similar. However, since the lower blade 405c cuts out the product portion, the lower blade 405c is given a design (micro unevenness, micro waviness, rounded corners, etc.) for determining the outer shape of the product, and the upper blade 405a and the middle step There is no need for such a design to be given to 405b.
- a flank surface 405 d is formed from the lower side to the lower end of the lower blade 405 c in the inner circumferential wall of the die 405.
- the clearance angle ⁇ 2 that forms the clearance surface 405 is about several degrees, similar to the clearance angle ⁇ 1 of the die 402 in the above-described precision punching device 400.
- a narrow range between the lower blade 405 c and the upper end of the flank surface 405 is formed as a parallel surface substantially parallel to the outer peripheral wall of the punch 404.
- the upper end surface of the die 405 may have a shear angle.
- both the die 405 and the punch 404 may have a shear angle. That is, it is preferable that a shear angle be provided between the upper end surface of the die 405 and the punched surface of the punch 404 regardless of whether it is outline removal or drilling. Thereby, the punching thrust can be reduced, and the punching accuracy can be improved.
- the clearance C between the die 405 and the punch 404 is set to the same extent (several to several tens of ⁇ m) as the precision punching device 400A.
- the precision punching device 400B may also include the peripheral device 406 in the same manner as the precision punching device 400A.
- the workpiece 450 here is, for example, a sheet-like material including a brittle material, like the workpiece 450 punched by the precision punching device 400A.
- the workpiece 450 is freely supported on the die 402.
- the workpiece 450 may be loosely supported by a pressing plate (not shown) to such an extent that deformation occurring at the time of punching is not suppressed.
- the punch 404 By inserting the punch 404 into the die 405, first, the workpiece 450 is punched out by the upper blade 405a, whereby a portion larger by two turns than the product portion is cut out. Further, by pushing the punch 404 downward, a portion larger than the portion punched by the upper blade 405a is cut out. Further, by pushing the punch 404 downward, the product part is cut out from the part punched out at 405b.
- the workpiece 450 is punched in a range slightly larger than a desired punching size (product size), and the punched workpiece 450 is further punched into a desired punching size.
- a desired punching size product size
- the brittle material can be punched with higher accuracy by performing punching a plurality of times.
- a sheet containing a brittle material such as a powder layer can be precisely punched with a single device if it has a simple shape.
- one kind of punch 404 and die 405 may be prepared. Therefore, the introduction cost of the processing apparatus is lowered, and the mold management can be facilitated.
- the precision punching devices 400A and 400B of the present embodiment can also be used for the cutting-off processing in the third and fourth embodiments.
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Abstract
Description
本発明の実施形態1について図1~図8に基づいて説明すると、以下の通りである。
図8は、本実施形態の比較例に係る全固体電池102の構造を示す断面図である。
本実施例では、積層体310を用いて第1の製造方法によって作製された全固体電池101について説明する。
本実施例では、積層体320を用いて第2の製造方法によって作製された全固体電池101について説明する。
比較例として、従来の製造方法で製造した全固体電池102について説明する。
実施例1および2で製造した全固体電池101と、比較例で製造した全固体電池102とを、恒温槽内において25℃で維持し、0.05mA/cm2の電流で、充電終止電圧4.2Vまで充電し、次いで0.05mA/cm2の電流で、放電終止電圧2.8Vまで放電した。このときの実施例結果を表1に示す。
本発明の実施形態2について図9および図10に基づいて説明すると、以下の通りである。なお、本実施形態において、実施形態1における構成要素と同一の機能を有する構成要素については、同一の符号を付記して、その説明を省略する。
本発明の実施形態3について図2、図10~図13に基づいて説明すると、以下の通りである。なお、本実施形態において、実施形態1における構成要素と同一の機能を有する構成要素については、同一の符号を付記して、その説明を省略する。
本発明の実施形態4について図2、図10、図14~図16に基づいて説明すると、以下の通りである。なお、本実施形態において、実施形態1における構成要素と同一の機能を有する構成要素については、同一の符号を付記して、その説明を省略する。
上式において、Wpは厚膜部903aの固体電解質層903の平均膜厚となる基準位置に対する最大の高さを表し、Wvは上記の基準位置に対する最大の低さを表している。また、Tは固体電解質層903の平均膜厚(μm)を表している。
本発明の実施形態5について図17~図19に基づいて説明すると、以下の通りである。なお、本実施形態において、実施形態1~4における構成要素と同一の機能を有する構成要素については、同一の符号を付記して、その説明を省略する。
本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。
92 負極層(第2電極層)
93 固体電解質層
94 正極層(第1電極層)
190 全固体電池(積層体)
310,320 積層体
301 支持板
302,312 正極層(第1電極層)
303,313 固体電解質層
304,314 負極層(第2電極層)
400A,400B 精密打ち抜き装置(加工装置)
402,405 ダイ
402a 刃先(刃)
402b,405d 逃げ面
404 パンチ
405a 上段刃(刃)
405b 中段刃(刃)
405a 下段刃(刃)
903 固体電解質層(起伏膜)
903a 厚膜部
Claims (15)
- 第1電極層と、前記第1電極層の極性と反対の極性を有する第2電極層と、前記第1電極層および前記第2電極層の間に介在する固体電解質層とを含む積層体を形成する積層体形成工程と、
前記積層体の外周端部を切り落とす切り落とし工程と、を含み、
前記積層体は粉体材料を含むことを特徴とする全固体電池の製造方法。 - 前記積層体を加圧する加圧工程をさらに含むことを特徴とする請求項1に記載の全固体電池の製造方法。
- 前記切り落とし工程後の前記積層体は、前記第1電極層と前記固体電解質層との界面の面積が、前記固体電解質層と前記第2電極層との界面の面積よりも小さく、かつ前記積層体の側面が傾斜していることを特徴とする請求項1または2に記載の全固体電池の製造方法。
- 前記切り落とし工程において、前記外周端部の切り落としを刃または抜型によって行うことを特徴とする請求項1から3のいずれか1項に記載の全固体電池の製造方法。
- 前記積層体は、一方の面に溝が形成され、かつ他方の面に前記積層体の層面が接した支持板を有し、
前記切り落とし工程において、前記溝に沿って前記支持板および前記積層体を分割することを特徴とする請求項1から4のいずれか1項に記載の全固体電池の製造方法。 - 前記切り落とし工程において、前記外周端部の切り落としと、前記積層体の複数部分への分割とを同時に行うことを特徴とする請求項1から5のいずれか1項に記載の全固体電池の製造方法。
- 前記切り落とし工程において、前記積層体における切り落とされる前記外周端部より内側の部分の剛性が、前記外周端部の剛性よりも高い状態で前記外周端部を切り落とすことを特徴とする請求項1に記載の全固体電池の製造方法。
- 前記切り落とし工程において、前記外周端部が剛性の高い高剛性部材を含む場合、前記外周端部の切り落としに先立って、前記高剛性部材を切り落とすことを特徴とする請求項7に記載の全固体電池の製造方法。
- 請求項4に記載の全固体電池の製造方法における前記切り落とし工程で切り落としを行う加工装置であって、
ダイと、
ダイ上に配置された前記積層体を100mm/sec以下の速度で打ち抜くパンチと、を備え、
前記ダイは、前記パンチが挿入される内周壁に逃げ面を有するとともに、前記パンチによる打ち抜きのために前記積層体の変形を抑制しないように保持していることを特徴とする加工装置。 - 前記ダイは、前記パンチが挿入される空間を形成する内周壁に複数の刃を有し、
前記刃は、前記ダイの上端面から下方に位置するほど開口面積が小さくなるように形成されていることを特徴とする請求項9に記載の加工装置。 - 前記ダイは、前記パンチが挿入される内周壁に少なくとも1つの刃を有するとともに、前記刃の下側に逃げ面が形成されていることを特徴とする請求項9または10に記載の加工装置。
- 第1電極層と、前記第1電極層の極性と反対の極性を有する第2電極層と、前記第1電極層および前記第2電極層の間に介在する固体電解質層とが支持板上に積層された全固体電池であって、
前記第1電極層と前記固体電解質層との界面の面積が、前記固体電解質層と前記第2電極層との界面の面積よりも小さく、
前記全固体電池の側面は傾斜していることを特徴とする全固体電池。 - 第1電極層と、前記第1電極層の極性と反対の極性を有する第2電極層と、前記第1電極層および前記第2電極層の間に介在する固体電解質層とが支持板上に積層された全固体電池であって、
前記第1電極層、前記第2電極層および前記固体電解質層の少なくともいずれか1層が起伏を有する起伏膜であり、かつ前記第1電極層、前記第2電極層および前記固体電解質層からなる積層体が平板状に形成されていることを特徴とする全固体電池。 - 前記固体電解質層の厚みが、外周部よりも、当該外周部の内側で薄いことを特徴とする請求項13に記載の全固体電池。
- 請求項13または14に記載の全固体電池を製造する全固体電池の製造方法であって、
大面積の全固体電池から複数の単体の全固体電池を前記起伏膜の厚膜部において切り出すことを特徴とする全固体電池の製造方法。
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JP2019561643A JP7082142B2 (ja) | 2017-12-28 | 2018-12-21 | 全固体電池、その製造方法および加工装置 |
CN201880083445.7A CN111527638B (zh) | 2017-12-28 | 2018-12-21 | 全固态电池的制造方法 |
KR1020207021720A KR102544158B1 (ko) | 2017-12-28 | 2018-12-21 | 전고체 전지, 그 제조방법 및 가공장치 |
US16/958,461 US20210057777A1 (en) | 2017-12-28 | 2018-12-21 | All-solid-state battery, method for manufacturing same, and processing device |
EP18895450.7A EP3734741A4 (en) | 2017-12-28 | 2018-12-21 | SOLID STATE BATTERY, METHOD OF MANUFACTURING IT, AND PROCESSING DEVICE |
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WO2022270042A1 (ja) * | 2021-06-21 | 2022-12-29 | パナソニックIpマネジメント株式会社 | 電池の製造方法 |
WO2023047931A1 (ja) | 2021-09-27 | 2023-03-30 | 日立造船株式会社 | 固体電池、固体電池の製造方法および固体電池の製造装置 |
WO2023210139A1 (ja) | 2022-04-28 | 2023-11-02 | 日立造船株式会社 | 固体電池の製造方法および固体電池の製造装置 |
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US20210057777A1 (en) | 2021-02-25 |
JP7082142B2 (ja) | 2022-06-07 |
CN111527638B (zh) | 2024-09-20 |
EP3734741A1 (en) | 2020-11-04 |
JPWO2019131503A1 (ja) | 2020-12-17 |
EP3734741A4 (en) | 2021-12-08 |
KR20200103778A (ko) | 2020-09-02 |
CN111527638A (zh) | 2020-08-11 |
KR102544158B1 (ko) | 2023-06-14 |
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