WO2020153458A1 - 全固体電池用外装材、その製造方法、及び全固体電池 - Google Patents
全固体電池用外装材、その製造方法、及び全固体電池 Download PDFInfo
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- WO2020153458A1 WO2020153458A1 PCT/JP2020/002426 JP2020002426W WO2020153458A1 WO 2020153458 A1 WO2020153458 A1 WO 2020153458A1 JP 2020002426 W JP2020002426 W JP 2020002426W WO 2020153458 A1 WO2020153458 A1 WO 2020153458A1
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- state battery
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 disclosure relates to an exterior material for an all-solid battery, a manufacturing method thereof, and an all-solid battery.
- All-solid-state batteries in which the electrolyte is a solid electrolyte are known.
- the all-solid-state battery has advantages of high safety and a wide operating temperature range because no organic solvent is used in the battery.
- sulfide-based inorganic solid electrolytes are known to have high ionic conductivity.
- the sulfide-based inorganic solid electrolyte contains a sulfur compound which may generate toxic hydrogen sulfide when reacted with water. Therefore, when the all-solid-state battery is damaged, there is a risk that hydrogen sulfide gas is generated by reacting with moisture in the air.
- a space for accommodating a battery element is provided by molding in a bag shape or by using a mold, and the space such as an electrode or a solid electrolyte is provided in the space.
- Patent Document 1 in an all-solid-state battery using a sulfide-based inorganic solid electrolyte, in order to cope with generation of hydrogen sulfide gas when the all-solid battery is damaged, an outer-body of the all-solid-state battery is further provided with an adsorbent. And/or a technique of coating with an alkaline substance-containing material has been proposed.
- the present disclosure provides a casing material for an all-solid-state battery, in which hydrogen sulfide generated inside the all-solid-state battery including a sulfide solid electrolyte material is effectively suppressed from leaking to the outside.
- the main purpose is that.
- the inventors of the present disclosure have made earnest studies to solve the above problems. As a result, at least, from the outside, a base material layer, a barrier layer, and a heat-fusible resin layer, which is an outer packaging material for an all-solid battery composed of a laminated body in this order, and which constitutes the heat-fusible resin layer. It was found that hydrogen sulfide generated in the all-solid-state battery containing the sulfide solid electrolyte material is effectively suppressed from leaking to the outside by the hydrogen sulfide permeation amount of the resin to be equal to or less than a predetermined value. It was found that hydrogen sulfide generated in the all-solid-state battery containing the sulfide solid electrolyte material is effectively suppressed from leaking to the outside by the hydrogen sulfide permeation amount of the resin to be equal to or less than a predetermined value. It was
- a base material layer which is composed of a laminated body in this order, for use in an all-solid-state battery containing a sulfide solid electrolyte material, an all-solid-state battery exterior material
- a packaging material for an all-solid-state battery wherein the resin forming the heat-fusible resin layer has a hydrogen sulfide permeation amount of 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less.
- an exterior material for an all-solid-state battery in which hydrogen sulfide generated inside the all-solid-state battery containing a sulfide solid electrolyte material is effectively suppressed from leaking to the outside.
- the manufacturing method of the exterior material for all-solid-state batteries and an all-solid-state battery can also be provided.
- FIG. 3 is a schematic plan view of an example of an all-solid-state battery to which the packaging material for all-solid-state batteries of the present disclosure is applied.
- FIG. 3 is a schematic cross-sectional view showing an example of a laminated structure of an exterior material for an all-solid battery of the present disclosure.
- FIG. 3 is a schematic cross-sectional view showing an example of a laminated structure of an exterior material for an all-solid battery of the present disclosure.
- FIG. 3 is a schematic cross-sectional view showing an example of a laminated structure of an exterior material for an all-solid battery of the present disclosure.
- FIG. 3 is a schematic cross-sectional view showing an example of a laminated structure of an exterior material for an all-solid battery of the present disclosure.
- FIG. 3 is a schematic cross-sectional view showing an example of a laminated structure of an exterior material for an all-solid battery of the present disclosure.
- FIG. 3 is a schematic diagram for explaining a method for measuring a hydrogen sulfide permeation amount of a resin forming a heat-fusible resin layer in Examples.
- the exterior material for an all-solid battery of the present disclosure is composed of a laminated body including a base material layer, a barrier layer, and a heat-fusible resin layer in this order from at least the outside, and is an all-solid material containing a sulfide solid electrolyte material.
- the all-solid-state battery exterior material of the present disclosure is provided with such a configuration, so that when applied as an all-solid-state battery exterior material containing a sulfide solid electrolyte material, hydrogen sulfide generated inside the all-solid-state battery. However, leakage to the outside is effectively suppressed.
- the exterior material for the all-solid-state battery of the present disclosure will be described in detail.
- the numerical range indicated by “to” means “greater than or equal to” and “less than or equal to”.
- the expression 2 to 15 mm means 2 mm or more and 15 mm or less.
- the exterior material 10 for all-solid-state battery of the present disclosure is, as shown in, for example, FIGS. 4 to 9, at least from the outside, the base material layer 1, the barrier layer 3, and the heat-sealing. And a resin layer 4 in this order.
- the heat-fusible resin layer 4 is the innermost layer.
- the heat-sealed peripheral portion of the space (concave portion) in which the battery element is accommodated is the portion where the metal terminal is present. Except for, it is preferably flat.
- a substance for absorbing hydrogen sulfide thermal fusion It is not necessary to dispose a hydrogen sulfide water-absorbing substance, which is different from the resin forming the functional resin layer.
- a barrier layer protective film 3 a may be provided on the surface of the barrier layer 3 on the side of the heat-fusible resin layer 4.
- a barrier layer protective film 3b is provided on the surface of the barrier layer 3 on the base material layer 1 side.
- FIG. 6 to FIG. 8 show schematic diagrams in the case where the all-solid-state battery exterior material 10 includes barrier layer protective films 3 a and 3 b on both surfaces of the barrier layer 3, respectively.
- the barrier layer protective film 3a may be provided only on the surface of the barrier layer 3 on the heat-fusible resin layer 4 side, or on both sides of the barrier layer 3 respectively.
- the barrier layer protective films 3a and 3b may be provided.
- the all-solid-state battery exterior material 10 is provided between the base material layer 1 and the barrier layer 3 (when the barrier layer protective film 3b is provided, the base material layer 1 and the barrier layer are protected).
- the adhesive layer 2 may be optionally provided (between the film 3b) for the purpose of enhancing the adhesiveness between these layers.
- FIG. 7 and FIG. 8 for example, between the barrier layer 3 and the heat-fusible resin layer 4 (when the barrier layer protective film 3a is provided, the barrier layer protective film 3a and the heat-fusible resin are provided).
- An adhesive layer 5 may be optionally provided (between the layers 4) for the purpose of enhancing the adhesiveness between these layers.
- a surface coating layer 6 and the like may be provided on the outer side of the base material layer 1 (on the side opposite to the heat-fusible resin layer 4 side), if necessary.
- the thickness of the laminate constituting the all-solid-state battery exterior material 10 is not particularly limited, but from the viewpoint of cost reduction, energy density improvement, etc., preferably about 10000 ⁇ m or less, about 8000 ⁇ m or less, about 5000 ⁇ m or less. From the viewpoint of maintaining the function of the all-solid-state battery casing material 10 to protect the battery element, preferably about 100 ⁇ m or more, about 150 ⁇ m or more, about 200 ⁇ m or more, and a preferable range is, for example, 100 to 10,000 ⁇ m.
- the solid electrolyte layer 40 includes a sulfide solid electrolyte material.
- the specific exterior material 10 is used. That is, the configurations (electrodes, terminals, etc.) other than the solid electrolyte layer 40 and the exterior material 10 are not particularly limited as long as they are applied to the all-solid-state battery, and those used in known all-solid-state batteries. May be Hereinafter, by taking the all-solid-state battery 70 of the present disclosure as an example, a mode in which the exterior packaging material 10 for an all-solid battery of the present disclosure is applied to the all-solid-state battery will be specifically described.
- an all-solid-state battery 70 of the present disclosure includes a positive electrode active material layer 31, a negative electrode active material layer 21, a positive electrode active material layer 31, and a negative electrode active material layer 21.
- the battery element including at least the unit cell 50 including the solid electrolyte layer 40 laminated on the above is housed in the package formed by the all-solid-state battery exterior material 10 of the present disclosure. More specifically, the positive electrode active material layer 31 is laminated on the positive electrode current collector 32 to form the positive electrode layer 30, and the negative electrode active material layer 21 is laminated on the negative electrode current collector 22 to form the negative electrode. It constitutes the layer 20.
- Each of the positive electrode current collector 32 and the negative electrode current collector 22 is joined to the terminal 60 exposed to the outside and electrically connected to the external environment.
- a solid electrolyte layer 40 is laminated between the positive electrode layer 30 and the negative electrode layer 20, and the positive electrode layer 30, the negative electrode layer 20, and the solid electrolyte layer 40 form a single battery 50.
- the battery element of the all-solid-state battery 70 may include only one unit cell 50, or may include a plurality of unit cells 50.
- FIG. 1 illustrates an all-solid-state battery 70 including two unit cells 50 as battery elements
- FIG. 2 illustrates an all-solid-state battery 70 in which three unit cells 50 are stacked to form a battery element. Showing.
- the flange portion (the heat-fusible resin layers 4 contact each other at the peripheral edge of the battery element). Area) can be formed, and the battery element is covered, and the heat-fusible resin layers 4 of the flange portion are heat-sealed to be hermetically sealed to form an all-solid-state battery using an all-solid-state battery exterior material. ..
- the heat-fusible resin portion of the all-solid-state battery exterior material 10 of the present disclosure is inside (the battery element and The wrapping body is formed so that it becomes the contact surface).
- the heat-sealed peripheral portion of the space (concave portion) in which the battery element is housed is flat except for the portion where the metal terminal is present. preferable.
- a substance for absorbing hydrogen sulfide (which is different from the resin forming the heat-fusible resin layer) is provided in the peripheral portion of the space (recess) in which the battery element is housed. , Hydrogen sulfide water-absorbing substance) is not necessary.
- the all-solid-state battery to which the packaging material 10 of the present disclosure is applied is not particularly limited as long as the solid electrolyte contains the sulfide solid electrolyte material and the specific packaging material 10 is used.
- materials and the like of members constituting a battery element of an all-solid-state battery to which the exterior material 10 of the present disclosure is applied will be exemplified.
- the positive electrode layer 30 has a structure in which a positive electrode active material layer 31 is stacked on a positive electrode current collector 32.
- the negative electrode layer 20 has a structure in which a negative electrode active material layer 21 is laminated on a negative electrode current collector 22. Then, the positive electrode current collector 32 and the negative electrode current collector 22 are respectively joined to the terminals 60 exposed to the outside and electrically connected to the external environment.
- the positive electrode active material layer 31 is a layer containing at least a positive electrode active material.
- the positive electrode active material layer 31 may further include a solid electrolyte material, a conductive material, a binder, etc., if necessary.
- the positive electrode active material is not particularly limited, and examples thereof include oxide active materials and sulfide active materials.
- the oxide active material used as the positive electrode active material include LiCoO 2 , LiMnO 2 , LiNiO 2 , LiVO 2 , LiNi 1/3 Co 1/3 Mn 1. /3 O 2 etc. rock salt layered active material, LiMn 2 O 4 , spinel type active material such as Li(Ni 0.5 Mn 1.5 )O 4 , olivine type active material such as LiFePO 4 , LiMnPO 4 , Li 2 FeSiO 4 , Examples thereof include Si-containing active materials such as Li 2 MnSiO 4 .
- the sulfide active material used as the positive electrode active material of the all-solid-state lithium battery include copper shubrel, iron sulfide, cobalt sulfide, and nickel sulfide.
- the shape of the positive electrode active material is not particularly limited, and examples thereof include particle shapes.
- the average particle diameter (D 50 ) of the positive electrode active material is preferably about 0.1 to 50 ⁇ m, for example.
- the content of the positive electrode active material in the positive electrode active material layer 31 is preferably about 10 to 99% by mass, more preferably about 20 to 90% by mass.
- the positive electrode active material layer 31 preferably further contains a solid electrolyte material. Thereby, the ion conductivity in the positive electrode active material layer 31 can be improved.
- the solid electrolyte material contained in the positive electrode active material layer 31 is the same as the solid electrolyte material exemplified in the solid electrolyte layer 40 described later.
- the content of the solid electrolyte material in the positive electrode active material layer is preferably about 1 to 90% by mass, more preferably about 10 to 80% by mass.
- the positive electrode active material layer 31 may further contain a conductive material.
- the addition of the conductive material can improve the electron conductivity of the positive electrode active material layer.
- the conductive material include acetylene black, Ketjen black, carbon fiber and the like.
- the positive electrode active material layer may further contain a binder.
- the binder include fluorine-containing binders such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF).
- the thickness of the positive electrode active material layer 31 is appropriately set according to the size of the all-solid-state battery and the like, but is preferably about 0.1 to 1000 ⁇ m.
- Positive electrode current collector 32 Examples of the material forming the positive electrode current collector 32 include stainless steel (SUS), aluminum, nickel, iron, titanium, carbon and the like.
- the thickness of the positive electrode current collector 32 is appropriately set according to the size of the all-solid-state battery, etc., but is preferably about 10 to 1000 ⁇ m.
- the negative electrode active material layer 21 is a layer containing at least a negative electrode active material.
- the negative electrode active material layer 21 may include a solid electrolyte material, a conductive material, a binder, and the like, if necessary, in addition to the negative electrode active material.
- the negative electrode active material is not particularly limited, and examples thereof include a carbon active material, a metal active material, and an oxide active material.
- the carbon active material include mesocarbon microbeads (MCMB), graphite such as highly oriented graphite (HOPG), and amorphous carbon such as hard carbon and soft carbon.
- the metal active material include In, Al, Si and Sn.
- the oxide active material include Nb 2 O 5 , Li 4 Ti 5 O 12 and SiO.
- the shape of the negative electrode active material is not particularly limited, and examples thereof include a particle shape and a film shape.
- the average particle size (D 50 ) of the negative electrode active material is preferably about 0.1 to 50 ⁇ m.
- the content of the negative electrode active material in the negative electrode active material layer 21 is, for example, about 10 to 99% by mass, more preferably about 20 to 90% by mass.
- the negative electrode active material layer 21 preferably further contains a solid electrolyte material. Thereby, the ion conductivity in the negative electrode active material layer 21 can be improved.
- the solid electrolyte material contained in the negative electrode active material layer 21 is the same as the solid electrolyte material exemplified in the solid electrolyte layer 40 described later.
- the content of the solid electrolyte material in the negative electrode active material layer 21 is preferably about 1 to 90% by mass, more preferably about 10 to 80% by mass.
- the negative electrode active material layer 21 may further contain a conductive material.
- the negative electrode active material layer 21 may further contain a binder.
- the conductive material and the binder are the same as those described above for the positive electrode active material layer 31.
- the thickness of the negative electrode active material layer 21 is appropriately set according to the size of the all-solid-state battery, etc., but is preferably about 0.1 to 1000 ⁇ m.
- Examples of the material forming the negative electrode current collector 22 include stainless steel (SUS), copper, nickel, carbon and the like.
- the thickness of the negative electrode current collector 22 is appropriately set according to the size of the all-solid-state battery, etc., but is preferably about 10 to 1000 ⁇ m.
- the solid electrolyte layer 40 is a layer containing a sulfide solid electrolyte material.
- Sulfide solid electrolyte materials are preferable in that many of them have higher ionic conductivity than oxide solid electrolyte materials.
- INDUSTRIAL APPLICABILITY When applied to an all-solid-state battery containing a sulfide solid electrolyte material, the exterior material 10 for an all-solid-state battery of the present disclosure effectively suppresses hydrogen sulfide generated inside the all-solid-state battery from leaking to the outside. can do.
- the sulfide solid electrolyte material for example, Li 2 S-P 2 S 5, Li 2 S-P 2 S 5 -LiI, Li 2 S-P 2 S 5 -Li 2 O, Li 2 S-P 2 S 5 -Li 2 O-LiI, Li 2 S-SiS 2 , Li 2 S-SiS 2 -LiI, Li 2 S-SiS 2 -LiBr, Li 2 S-SiS 2 -LiCl, Li 2 S --SiS 2 --B 2 S 3 --LiI, Li 2 S--SiS 2 --P 2 S 5 --LiI, Li 2 S--B 2 S 3 , Li 2 SP 2 S 5 --ZmSn (where m and n are positive Z is Ge, Zn, or Ga.), Li 2 S-GeS 2 , Li 2 S-SiS 2 -Li 3 PO 4 , Li 2 S-SiS 2 -Li x MO y (howeverever
- Li 2 S-P 2 S 5 means a sulfide solid electrolyte material using a raw material composition containing Li 2 S and P 2 S 5, and the same applies to other descriptions. is there.
- the sulfide solid electrolyte material may be sulfide glass or crystallized sulfide glass.
- the content of the solid electrolyte material in the solid electrolyte layer 40 is not particularly limited, but is preferably 60% by mass or more, more preferably 70% by mass or more, and further preferably 80% by mass or more.
- the solid electrolyte layer may contain a binder, or may be composed only of the solid electrolyte material.
- the thickness of the solid electrolyte layer 40 is appropriately set according to the size of the all solid state battery, etc., but is preferably about 0.1 to 1000 ⁇ m, more preferably about 0.1 to 300 ⁇ m.
- the all-solid-state battery 70 of the present disclosure can be preferably used in an environment that is restrained under high pressure from the outside.
- the pressure for restraining the all-solid-state battery 70 from the outside is preferably about from the viewpoint of suitably suppressing peeling between the solid electrolyte and the negative electrode active material layer (and further between the solid electrolyte and the positive electrode active material layer).
- Examples of a method of restraining the all-solid-state battery 70 from the outside under high pressure include a method of sandwiching the all-solid-state battery with a metal plate or the like and fixing it in a high-pressure pressed state (for example, tightening with a vise).
- the temperature for restraining the all-solid-state battery 70 from the outside is preferably 20° C. or higher, more preferably 40° C. or higher, and preferably 200° C. or lower, more preferably 150° C. or lower.
- the preferred range is about 20 to 150°C.
- the shape of the all-solid-state battery 70 of the present disclosure is not particularly limited, but is preferably a rectangular shape in plan view as shown in the schematic view of FIG. 3, for example. Further, the ratio of the length of the first side of the all-solid-state battery 70 having a rectangular shape in plan view to the length of the second side perpendicular to the first side (length of the first side: length of the second side). Is preferably about 1:1 to 1:5. If the length of the second side with respect to the first side is too long, the second side becomes difficult to be fixed to the mold when the exterior material 10 is molded to form the molding part M described later, and the molding part is formed. The R value (curvature radius) of the ridge portion (first curved portion described later) along the second side of M tends to be too large.
- the battery element is formed such that the exterior material 10 projects from the heat-fusible resin layer 4 side to the barrier layer 3 side. It is preferably housed in the molded portion M having a rectangular shape in plan view.
- FIG. 1 shows a diagram in which the molding portion M is formed on one side of the all-solid-state battery 70.
- FIG. 2 shows a diagram in which the molding portion M is formed on both sides of the all-solid-state battery 70.
- the all-solid-state battery 70 when the all-solid-state battery 70 is viewed in a plan view from the barrier layer 3 side, two sides of the rectangular molded portion M parallel to each other (two sides parallel to the y direction of FIGS. 1 to 3 or z). (Two sides parallel to the direction) and a straight line that passes through the middle of the two parallel sides (see the broken line Y in the y direction and the broken line Z in the z direction in FIG. 3).
- the first bending portion R1 see R1z in FIG. 2
- the second bending portion R2 see R2z in FIG. 2 are provided in order from the center portion to the end portion of the exterior material 10.
- the R value (radius of curvature) in the first curved portion R1 is 1 mm or more.
- the force for stretching the exterior material 10 at the corners (corners) of the rectangular shaped molding M does not become too large, and before reaching a predetermined molding depth.
- generation of pinholes or the like in the barrier layer 3 is suppressed.
- the exterior material 10 is molded using a mold, the exterior material 10 projects from the heat-fusible resin layer 4 side to the barrier layer 3 side, and the first curved portion R1 and the second curved portion R1 are curved.
- a molding portion M including the portion R2 is formed. In the molded portion M, the first curved portion R1 is located at a position protruding outside the all-solid-state battery.
- the cross-sectional view on the broken line Z corresponds to the schematic view of FIG. 2, and the molding portion M is arranged in order from the central portion to the end portion of the exterior material 10 to form the first curved portion R1z and , And a second curved portion R2z.
- the molding portion M in the cross section on the broken line Y, includes a first bending portion R1y and a second bending portion R2y in order from the central portion to the end portion of the exterior material 10. ..
- the expression "first curved portion R1z" means the first curved portion in the z direction.
- the notation “second curved portion R2z” means the second curved portion in the z direction
- the notation “first curved portion R1y” means the first curved portion in the y direction
- Second curved portion R2y means that the second curved portion is in the y direction.
- the first curved portion R1y if the R value (curvature radius) is 1 mm or more, as in the case of the R value in the first curved portion R1, the exterior material is provided at the corners (corner portions) of the rectangular molded portion M.
- the R value (curvature radius) is 1 mm or more because the force for stretching 10 does not become too large and pinholes and the like are suppressed from occurring in the barrier layer 3 before reaching the predetermined molding depth. It is preferable.
- the R values (radius of curvature) of the first curved portion R1 and the second curved portion R2 are respectively the barrier layer 3 side of the exterior material 10 (that is, the outer surface side of the exterior material 10, for example, as shown in FIG. Is an R value (radius of curvature) on the surface of a portion surrounded by a broken line.
- the R value (curvature radius) in R1z is preferably larger than the R value (curvature radius) in the first curved portion R1y along the long side parallel to the z direction.
- Each layer forming the exterior material for all-solid-state battery The exterior material 10 of the present disclosure is composed of a laminate including at least the base material layer 1, the barrier layer 3, and the heat-fusible resin layer 4 in this order from the outside. Further, the hydrogen sulfide permeation amount of the resin forming the heat-fusible resin layer 4 is 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less.
- each layer constituting the exterior material 10 of the present disclosure will be described in detail.
- the base material layer 1 is provided on the outside of the barrier layer 3 (when the barrier layer protective film 3b is provided, the barrier layer protective film 3b is used for the purpose of exerting the function of the exterior material 10 as a base material). Outer side), and a layer provided as necessary. The base material layer 1 is located on the outer layer side of the exterior material 10.
- the material forming the base material layer 1 is not particularly limited as long as it has a function as a base material, that is, at least an insulating property.
- the base material layer 1 can be formed by using, for example, a resin, and the resin may contain an additive described below.
- the base material layer 1 may be, for example, a resin film formed of a resin, or may be formed by applying a resin.
- the resin film may be an unstretched film or a stretched film.
- the stretched film include a uniaxially stretched film and a biaxially stretched film, and a biaxially stretched film is preferable.
- the stretching method for forming the biaxially stretched film include a sequential biaxial stretching method, an inflation method and a simultaneous biaxial stretching method.
- the method for applying the resin include a roll coating method, a gravure coating method and an extrusion coating method.
- Examples of the resin forming the base material layer 1 include resins such as polyester, polyamide, polyolefin, epoxy resin, acrylic resin, fluororesin, polyurethane, silicon resin and phenol resin, and modified products of these resins.
- the resin forming the base layer 1 may be a copolymer of these resins or a modified product of the copolymer. Further, it may be a mixture of these resins.
- the resin forming the base material layer 1 is preferably polyester or polyamide.
- polyester examples include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolyester.
- copolyester examples include a copolyester having ethylene terephthalate as a main repeating unit.
- a copolymer polyester (hereinafter, abbreviated to polyethylene (terephthalate/isophthalate)) in which ethylene terephthalate is a main repeating unit and is polymerized with ethylene isophthalate, polyethylene (terephthalate/adipate), polyethylene (terephthalate/ Sodium sulfoisophthalate), polyethylene (terephthalate/sodium isophthalate), polyethylene (terephthalate/phenyl-dicarboxylate), polyethylene (terephthalate/decanedicarboxylate), and the like.
- These polyesters may be used alone or in combination of two or more.
- polyamides include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and nylon 66; terephthalic acid and/or isophthalic acid.
- Hexamethylenediamine-isophthalic acid-terephthalic acid copolyamides such as nylon 6I, nylon 6T, nylon 6IT, nylon 6I6T (I represents isophthalic acid, T represents terephthalic acid) containing a constitutional unit derived therefrom, polyamide MXD6 (polymeta Polyamides containing aromatic compounds such as silylene adipamide; alicyclic polyamides such as polyamide PACM6 (polybis(4-aminocyclohexyl)methane adipamide); lactam components and isocyanate components such as 4,4′-diphenylmethane-diisocyanate Examples thereof include copolymerized polyamides, polyesteramide copolymers and polyetheresteramide copoly
- the base material layer 1 preferably contains at least one of a polyester film, a polyamide film, and a polyolefin film, and preferably contains at least one of a stretched polyester film, a stretched polyamide film, and a stretched polyolefin film, It is more preferable to include at least one of a stretched polyethylene terephthalate film, a stretched polybutylene terephthalate film, a stretched nylon film, and a stretched polypropylene film.
- the base material layer 1 may be a single layer or may be composed of two or more layers.
- the base material layer 1 may be a laminate in which a resin film is laminated with an adhesive or the like, or a resin is coextruded into two or more layers. It may be a laminate of the above resin films. Further, a resin film laminate obtained by coextruding a resin into two or more layers may be used as the base material layer 1 without being stretched, or may be uniaxially or biaxially stretched to form the base material layer 1.
- the base material layer 1 is a single layer
- the base material layer 1 is preferably composed of a single layer of polyester resin.
- the laminate of two or more resin films in the base material layer 1 include a laminate of a polyester film and a nylon film, a laminate of two or more nylon films, a laminate of two or more polyester films. And the like, and preferably a laminate of a stretched nylon film and a stretched polyester film, a laminate of two or more stretched nylon films, and a laminate of two or more stretched polyester films.
- the base material layer 1 is a laminated body of two resin films, a laminated body of a polyester resin film and a polyester resin film, a laminated body of a polyamide resin film and a polyamide resin film, or a laminated body of a polyester resin film and a polyamide resin film.
- a laminate is preferred, and a laminate of a polyethylene terephthalate film and a polyethylene terephthalate film, a laminate of a nylon film and a nylon film, or a laminate of a polyethylene terephthalate film and a nylon film is more preferred.
- the two or more resin films may be laminated via an adhesive.
- preferable adhesives include the same adhesives as those exemplified for the adhesive layer 2 described later.
- the method of laminating two or more resin films is not particularly limited, and a known method can be adopted, and examples thereof include a dry laminating method, a sandwich laminating method, an extrusion laminating method, a thermal laminating method, and the like, and preferably a dry laminating method. A laminating method can be mentioned. When laminating by a dry laminating method, it is preferable to use a polyurethane adhesive as the adhesive.
- the thickness of the adhesive is, for example, about 2 to 5 ⁇ m.
- an anchor coat layer may be formed on the resin film and laminated.
- the anchor coat layer may be the same as the adhesive exemplified in the adhesive layer 2 described later.
- the thickness of the anchor coat layer is, for example, about 0.01 to 1.0 ⁇ m.
- additives such as a lubricant, a flame retardant, an antiblocking agent, an antioxidant, a light stabilizer, a tackifier, and an antistatic agent are present on at least one of the surface and the inside of the base material layer 1. Good.
- the additive only one kind may be used, or two or more kinds may be mixed and used.
- a lubricant be present on the surface of the base material layer 1 from the viewpoint of enhancing the moldability of the exterior material 10.
- the lubricant is not particularly limited, but preferably an amide lubricant is used.
- Specific examples of the amide-based lubricant include saturated fatty acid amide, unsaturated fatty acid amide, substituted amide, methylol amide, saturated fatty acid bisamide, unsaturated fatty acid bisamide, fatty acid ester amide, aromatic bisamide, and the like.
- Specific examples of the saturated fatty acid amide include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide.
- unsaturated fatty acid amides include oleic acid amide and erucic acid amide.
- substituted amide include N-oleylpalmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, and N-stearyl erucic acid amide.
- methylolamide include methylolstearic acid amide.
- saturated fatty acid bisamide examples include methylenebisstearic acid amide, ethylenebiscapric acid amide, ethylenebislauric acid amide, ethylenebisstearic acid amide, ethylenebishydroxystearic acid amide, ethylenebisbehenic acid amide, and hexamethylenebisstearic acid amide.
- saturated fatty acid bisamide examples include acid amide, hexamethylene bisbehenic acid amide, hexamethylene hydroxystearic acid amide, N,N′-distearyl adipic acid amide and N,N′-distearyl sebacic acid amide.
- the unsaturated fatty acid bisamide include ethylene bisoleic acid amide, ethylene bis erucic acid amide, hexamethylene bis oleic acid amide, N,N′-dioleyl adipate amide, N,N′-dioleyl sebacic acid amide. And so on.
- Specific examples of the fatty acid ester amide include stearoamide ethyl stearate.
- specific examples of the aromatic bisamide include m-xylylenebisstearic acid amide, m-xylylenebishydroxystearic acid amide, N,N'-distearylisophthalic acid amide and the like.
- the lubricant may be used alone or in combination of two or more.
- a lubricant When a lubricant is present on the surface of the base material layer 1, its amount is not particularly limited, but is preferably about 3 mg/m 2 or more, more preferably about 4 to 15 mg/m 2 , and further preferably 5 to 14 mg. /M 2 can be mentioned.
- the lubricant present on the surface of the base material layer 1 may be one in which the lubricant contained in the resin constituting the base material layer 1 is exuded, or the lubricant is applied to the surface of the base material layer 1. May be.
- the thickness of the base material layer 1 is not particularly limited as long as it can function as a base material, but is, for example, about 3 to 50 ⁇ m, preferably about 10 to 35 ⁇ m.
- the thickness of the resin film forming each layer is preferably about 2 to 25 ⁇ m.
- the adhesive layer 2 has adhesiveness between the base material layer 1 and the barrier layer 3 (adhesiveness between the base material layer 1 and the barrier layer protective film 3b when the barrier layer protective film 3b is provided). It is a layer provided between them for the purpose of increasing the temperature.
- the adhesive layer 2 is formed of an adhesive that can bond the base material layer 1 and the barrier layer 3 (or the barrier layer protective film 3b).
- the adhesive used for forming the adhesive layer 2 is not limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a heat pressure type and the like. Further, it may be a two-component curing type adhesive (two-component adhesive), a one-component curing type adhesive (one-component adhesive), or a resin that does not undergo a curing reaction.
- the adhesive layer 2 may be a single layer or a multilayer.
- the adhesive component contained in the adhesive include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polyesters such as copolyester; polyether; polyurethane; epoxy resin; Phenol resin; nylon 6, nylon 66, nylon 12, polyamide such as copolyamide; polyolefin resin such as polyolefin, cyclic polyolefin, acid-modified polyolefin, acid-modified cyclic polyolefin; polyvinyl acetate; cellulose; (meth)acrylic resin; Polyimide; polycarbonate; amino resins such as urea resins and melamine resins; rubbers such as chloroprene rubber, nitrile rubber and styrene-butadiene rubber; silicone resins and the like.
- adhesive components may be used alone or in combination of two or more.
- a polyurethane adhesive is preferable.
- the resin serving as the adhesive component may be used in combination with an appropriate curing agent to enhance the adhesive strength.
- the curing agent is appropriately selected from polyisocyanates, polyfunctional epoxy resins, oxazoline group-containing polymers, polyamine resins, acid anhydrides, etc. depending on the functional groups of the adhesive component.
- the polyurethane adhesive includes, for example, a polyurethane adhesive containing a base compound containing a polyol compound and a curing agent containing an isocyanate compound.
- a polyurethane adhesive containing a base compound containing a polyol compound and a curing agent containing an isocyanate compound.
- Preferred is a two-component curing type polyurethane adhesive containing a polyol such as a polyester polyol, a polyether polyol and an acrylic polyol as a main component and an aromatic or aliphatic polyisocyanate as a curing agent.
- a polyester polyol having a hydroxyl group at the side chain in addition to the hydroxyl group at the terminal of the repeating unit.
- the adhesive layer 2 may contain other components as long as it does not impair the adhesiveness, and may contain a colorant, a thermoplastic elastomer, a tackifier, a filler and the like. Since the adhesive layer 2 contains the coloring agent, the exterior material 10 can be colored. Known colorants such as pigments and dyes can be used as the colorant. Moreover, only one type of colorant may be used, or two or more types may be mixed and used.
- the type of pigment is not particularly limited as long as it does not impair the adhesiveness of the adhesive layer 2.
- organic pigments include azo, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigothioindigo, perinone-perylene, isoindolenin, benzimidazolone pigments, and the like.
- the pigment include carbon black pigments, titanium oxide pigments, cadmium pigments, lead pigments, chromium oxide pigments, iron pigments and the like, and mica (mica) fine powder, fish scale foil and the like.
- colorants for example, carbon black is preferable in order to make the exterior material 10 have a black appearance.
- the average particle diameter of the pigment is not particularly limited and may be, for example, about 0.05 to 5 ⁇ m, preferably about 0.08 to 2 ⁇ m.
- the average particle size of the pigment is the median size measured by a laser diffraction/scattering particle size distribution measuring device.
- the content of the pigment in the adhesive layer 2 is not particularly limited as long as the exterior material 10 is colored, and is, for example, about 5 to 60% by mass, preferably 10 to 40% by mass.
- the thickness of the adhesive layer 2 is not particularly limited as long as the base material layer 1 and the barrier layer 3 can be adhered to each other, but examples thereof include about 1 ⁇ m or more and about 2 ⁇ m or more, and about 10 ⁇ m or less and about 5 ⁇ m or less.
- the preferable range is about 1 to 10 ⁇ m, about 1 to 5 ⁇ m, about 2 to 10 ⁇ m, and about 2 to 5 ⁇ m.
- the colored layer is a layer that is provided between the base material layer 1 and the barrier layer 3 (or the barrier layer protective film 3b) as necessary (not shown).
- a coloring layer may be provided between the base material layer 1 and the adhesive layer 2, and between the adhesive layer 2 and the barrier layer 3 (or the barrier layer protective film 3b). ..
- a colored layer may be provided outside the base material layer 1.
- the exterior material 10 can be colored by providing the colored layer.
- the colored layer is formed, for example, by applying an ink containing a colorant to the surface of the substrate layer 1 or the surface of the barrier layer 3 (the surface of the barrier layer protective film 3b when the barrier layer protective film 3b is provided). Can be formed. Known colorants such as pigments and dyes can be used as the colorant. Moreover, only one type of colorant may be used, or two or more types may be mixed and used.
- coloring agent contained in the coloring layer are the same as those exemplified in the section of [Adhesive layer 2].
- the barrier layer 3 is a layer that suppresses at least infiltration of moisture.
- the barrier layer 3 examples include a metal foil having a barrier property, a vapor deposition film, a resin layer, and the like.
- the vapor deposition film may be a metal vapor deposition film, an inorganic oxide vapor deposition film, a carbon-containing inorganic oxide vapor deposition film, or the like
- the resin layer may be polyvinylidene chloride, chlorotrifluoroethylene (CTFE)-based polymers or tetra- Examples thereof include polymers containing fluoroethylene (TFE) as a main component, polymers having a fluoroalkyl group, fluorine-containing resins such as polymers having a fluoroalkyl unit as a main component, and ethylene vinyl alcohol copolymers.
- CTFE chlorotrifluoroethylene
- barrier layer 3 a resin film provided with at least one of the vapor deposition film and the resin layer may be used.
- a plurality of barrier layers 3 may be provided.
- the barrier layer 3 preferably includes a layer made of a metal material. Specific examples of the metal material forming the barrier layer 3 include aluminum alloys, stainless steels, titanium steels, and steel plates. When used as metal foils, at least one of aluminum alloy foils and stainless steel foils is included. It is preferable.
- the aluminum alloy foil is more preferably, for example, a soft aluminum alloy foil composed of an annealed aluminum alloy or the like, and from the viewpoint of further improving the formability, It is preferably an aluminum alloy foil containing iron.
- the content of iron is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass.
- the iron content is 0.1% by mass or more, it is possible to obtain an exterior material having more excellent moldability.
- the iron content is 9.0% by mass or less, it is possible to obtain a packaging material having more excellent flexibility.
- the soft aluminum alloy foil for example, an aluminum alloy having a composition defined by JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O.
- Foil can be mentioned. If necessary, silicon, magnesium, copper, manganese, etc. may be added.
- the softening can be performed by annealing treatment or the like.
- examples of stainless steel foils include austenite-based, ferrite-based, austenite-ferrite-based, martensite-based, and precipitation-hardening-based stainless steel foils. Further, from the viewpoint of providing the exterior material 10 having excellent formability, the stainless steel foil is preferably made of austenitic stainless steel.
- SUS304, SUS301, SUS316L and the like are specific examples of the austenitic stainless steel forming the stainless steel foil, and among these, SUS304 is particularly preferable.
- the thickness of the barrier layer 3 may at least exhibit a function as a barrier layer that suppresses the infiltration of moisture, and is, for example, about 9 to 200 ⁇ m.
- the thickness of the barrier layer 3 is, for example, preferably about 85 ⁇ m or less, more preferably about 50 ⁇ m or less, further preferably about 40 ⁇ m or less, particularly preferably about 35 ⁇ m or less, and preferably about 10 ⁇ m or more, more preferably
- the thickness is about 20 ⁇ m or more, more preferably about 25 ⁇ m or more, and the preferable range of the thickness is about 10 to 85 ⁇ m, about 10 to 50 ⁇ m, about 10 to 40 ⁇ m, about 10 to 35 ⁇ m, about 20 to 85 ⁇ m, 20 to 50 ⁇ m.
- the barrier layer 3 is made of an aluminum alloy foil, the above-mentioned range is particularly preferable, and the range of about 25 to 85 ⁇ m and about 25 to 50 ⁇ m is particularly preferable.
- the thickness of the stainless steel foil is preferably about 60 ⁇ m or less, more preferably about 50 ⁇ m or less, further preferably about 40 ⁇ m or less, and further preferably about 30 ⁇ m or less, particularly preferably about 25 ⁇ m or less, preferably about 10 ⁇ m or more, more preferably about 15 ⁇ m or more, and a preferable thickness range is about 10 to 60 ⁇ m, about 10 to 50 ⁇ m, 10 to Examples include about 40 ⁇ m, about 10 to 30 ⁇ m, about 10 to 25 ⁇ m, about 15 to 60 ⁇ m, about 15 to 50 ⁇ m, about 15 to 40 ⁇ m, about 15 to 30 ⁇ m, about 15 to 25 ⁇ m.
- the exterior material 10 is preferably provided with a barrier layer protective film 3 a on the surface of the barrier layer 3 on the side of the heat-fusible resin layer 4. Further, it is also preferable that the surface of the barrier layer 3 on the base material layer 1 side is provided with a barrier layer protective film 3b.
- the barrier layer protective film 3a may be provided only on the surface of the barrier layer 3 on the side of the heat-fusible resin layer 4, or the barrier layer protective film may be provided on both surfaces of the barrier layer 3, respectively. You may provide 3a, 3b.
- the ratio P PO3 /CrPO4 is preferably in the range 6-120 .
- the all-solid battery in order to suppress separation between the solid electrolyte and the negative electrode active material layer or the positive electrode active material layer, the all-solid battery is restrained by a high-pressure press from the outside of the exterior material even during use. It is desired to continue.
- the heat-fusible resin layer of the exterior material is strongly pressed against the battery element. The thickness of the heat-fusible resin layer (inner layer) of the exterior material may be reduced, and the barrier layer laminated on the exterior material may come into contact with the solid electrolyte.
- the barrier layer of the exterior material and the solid electrolyte containing the sulfide solid electrolyte material are in contact with each other and an electric current is applied between them, an alloy is generated on the surface of the barrier layer, which deteriorates the barrier layer. is there.
- the all-solid-state battery 70 of the present disclosure when the barrier layer protective film 3a having the peak intensity ratio within the specific range is provided on the surface of the barrier layer 3 of the exterior material 10, Since the all-solid-state battery 70 is constrained in a high-pressure state, the solid electrolyte containing the sulfide solid electrolyte material penetrates the heat-fusible resin layer 4 and the adhesive layer 5, and the barrier layer 3 and the solid electrolyte. Even when electricity is applied to the layer 40, it is difficult for an alloy to be generated on the surface of the barrier layer 3, and the deterioration of the barrier layer 3 is effectively suppressed.
- the ratio P PO3 /CrPO 4 of the peak intensity P PO3 derived from PO 3 ⁇ to the peak intensity P CrPO4 derived from CrPO 4 ⁇ is preferably in the range of 6 to 120, and deterioration of the barrier layer 3 is further suppressed.
- the lower limit of the ratio P PO3 /CrPO4 is preferably about 10 or more, and the upper limit is preferably about 115 or less, more preferably about 110 or less, further preferably about 50 or less.
- the preferable range of the ratio P PO3 /CrPO4 is about 6 to 115, about 6 to 110, about 6 to 50, about 10 to 120, about 10 to 115, about 10 to 110, about 10 to 50. Of these, about 10 to 50 is more preferable, and about 25 to 30 is particularly preferable.
- the barrier layer protective film 3a when analyzed by using the time-of-flight secondary ion mass spectrometry, the peak intensity derived from CrPO 4 ⁇ and the peak intensity derived from PO 2 ⁇ relative to P CrPO 4 ⁇ .
- the ratio P PO2 / CrPO4 of P PO2 is preferably in the range of 7-70.
- the ratio P PO2/CrPO4 of the peak intensity P PO2 derived from PO 2 ⁇ to the peak intensity P CrPO4 derived from CrPO 4 ⁇ is preferably in the range of 7 to 70, and the deterioration of the barrier layer 3 is more effective.
- the ratio P PO2/CrPO4 has a lower limit of preferably about 10 or more, and an upper limit of preferably about 65 or less, more preferably about 50 or less.
- the preferable range of the ratio P PO2/CrPO4 is about 7 to 70, about 7 to 65, about 7 to 50, about 10 to 70, about 10 to 65, about 10 to 50. It is more preferably about 50 to 50, and even more preferably about 15 to 20.
- the peak intensity ratio P PO3 /CrPO4 is within the above range for both the barrier layer protective films 3a and 3b. It is preferable that P PO2/CrPO4 is also within the above range.
- the method of analyzing the barrier layer protective films 3a and 3b by using the time-of-flight secondary ion mass spectrometry is specifically performed by using a time-of-flight secondary ion mass spectrometer under the following measurement conditions. be able to.
- the barrier layer protective film contains chromium.
- the layers (adhesive layer, heat-fusible resin layer, adhesive layer, etc.) laminated on the barrier layer are physically peeled off.
- the barrier layer is placed in an electric furnace, and the organic component existing on the surface of the barrier layer is removed at about 300° C. for about 30 minutes.
- chromium is contained by using X-ray photoelectron spectroscopy of the surface of the barrier layer.
- the barrier layer protective films 3a and 3b can be formed by subjecting the surface of the barrier layer 3 to chemical conversion treatment with a treatment liquid containing a chromium compound such as chromium oxide.
- a treatment liquid containing a chromium compound for example, phosphoric acid and/or its salt in which a chromium compound such as chromium oxide is dispersed is applied to the surface of the barrier layer 3 and baked.
- a method of forming a barrier layer protective film on the surface of the barrier layer 3 by carrying out is performed.
- the peak intensity ratio P PO3 /CrPO 4 of the barrier layer protective films 3 a and 3 b, and further the peak intensity ratio P PO2/CrPO 4 are, for example, the composition of the treatment liquid for forming the barrier layer protective films 3 a and 3 b, and It can be adjusted according to manufacturing conditions such as the temperature and time of the baking treatment.
- the ratio of the chromium compound to the phosphoric acid and/or its salt in the treatment liquid containing the chromium compound is not particularly limited, but the peak intensity ratio P PO3 /CrPO4 and the peak intensity ratio P PO2/CrPO4 are From the viewpoint of setting within the above range, the ratio of phosphoric acid and/or its salt to 100 parts by mass of the chromium compound is preferably about 30 to 120 parts by mass, more preferably about 40 to 110 parts by mass. ..
- the phosphoric acid and its salt for example, condensed phosphoric acid and its salt can also be used.
- the treatment liquid containing the chromium compound may further contain an anionic polymer and a crosslinking agent for crosslinking the anionic polymer.
- the anionic polymer include poly(meth)acrylic acid or a salt thereof, a copolymer containing (meth)acrylic acid or a salt thereof as a main component, and the like.
- the cross-linking agent include compounds having a functional group of any one of an isocyanate group, a glycidyl group, a carboxyl group and an oxazoline group, and a silane coupling agent.
- the anionic polymer and the cross-linking agent may each be one type or two or more types.
- the treatment liquid containing the chromium compound contains an aminated phenol polymer.
- the content of the aminated phenol polymer is preferably about 100 to 400 parts by mass, more preferably about 200 to 300 parts by mass with respect to 100 parts by mass of the chromium compound.
- the weight average molecular weight of the aminated phenol polymer is preferably about 5,000 to 20,000.
- the weight average molecular weight of the aminated phenol polymer is a value measured by gel permeation chromatography (GPC), which was measured under the condition that polystyrene was used as a standard sample.
- the solvent of the treatment liquid containing the chromium compound is not particularly limited as long as it can evaporate the components contained in the treatment liquid by subsequent heating, but water is preferable.
- the solid concentration of the treatment liquid containing the chromium compound is, for example, about 1 to 15% by mass.
- the surface temperature of the barrier layer when the treatment liquid is applied to the surface of the barrier layer and heated to form the barrier layer protective film is preferably about 190 to 220° C., and the heating time is 3 to It may be about 6 seconds. By adopting such a temperature and heating time, the solvent can be appropriately evaporated and the barrier layer protective film can be suitably formed.
- the solid concentration of the chromium compound contained in the treatment liquid for forming the barrier layer protective films 3a and 3b is not particularly limited, but the peak intensity ratio P PO3 /CrPO4 and the peak intensity ratio P PO2/CrPO4 are From the viewpoint of effectively suppressing the deterioration of the barrier layer 3 by setting each of the above-mentioned predetermined ranges, it is preferably about 7.0 to 12.0 mass %, more preferably 8.0 to 11.0 mass %. And more preferably about 9.0 to 10.0% by mass.
- each of the barrier layer protective films 3a and 3b is not particularly limited, but from the viewpoint of effectively suppressing the deterioration of the barrier layer 3, it is preferably about 1 nm to 10 ⁇ m, more preferably about 1 to 100 nm, further It is preferably about 1 to 50 nm.
- the thickness of the barrier layer protective film can be measured by observation with a transmission electron microscope or a combination of observation with a transmission electron microscope and energy dispersive X-ray spectroscopy or electron beam energy loss spectroscopy.
- the amount of the barrier layer protective films 3a and 3b per 1 m 2 of the surface of the barrier layer 3 is preferably about 1 to 500 mg, more preferably about 1 to 100 mg, and further preferably about 1 to 50 mg. Are listed.
- Examples of the method of applying the treatment liquid containing the chromium compound to the surface of the barrier layer include a bar coating method, a roll coating method, a gravure coating method and a dipping method.
- the treatment liquid is baked by setting the peak intensity ratio P PO3 /CrPO4 and further the peak intensity ratio P PO2/CrPO4 respectively within the predetermined ranges.
- the heating temperature for forming the barrier layer protective film is preferably about 170 to 250°C, more preferably about 180 to 230°C.
- the baking time is preferably about 2 to 10 seconds, more preferably about 3 to 6 seconds.
- an alkali dipping method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid is used.
- Degreasing treatment is preferably performed by a known treatment method such as a washing method or an acid activation method.
- the heat-fusible resin layer 4 corresponds to the innermost layer, and when the all-solid battery is assembled, the heat-fusible resin layers 4 are heat-fused to form a battery element. It is a layer (sealant layer) that exhibits a sealing function.
- the hydrogen sulfide permeation amount of the resin forming the heat-fusible resin layer 4 is 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less. is there.
- the hydrogen sulfide permeation amount of the resin forming the heat-fusible resin layer 4 can be specifically measured by the method described in the examples.
- the hydrogen sulfide permeation amount of the resin constituting the heat-fusible resin layer 4 is preferably about 8.0 ⁇ 10 ⁇ 10 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less, more preferably about 5.0 ⁇ 10 ⁇ . It is 10 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less.
- the lower limit of the permeation amount of hydrogen sulfide is, for example, about 1.0 ⁇ 10 ⁇ 10 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg.
- the water vapor permeability of the heat-fusible resin layer 4 per 1 m 2 is preferably about 15.0 g/m 2 /24 h or less, more preferably about 10.0 g/m 2 /24 h or less, and further preferably It is about 8.0 g/m 2 /24 h or less, more preferably 1.0 g/m 2 /24 h or less.
- the lower limit of the total water vapor transmission amount is, for example, about 5.0 g/m 2 /24 h, about 1.0 g/m 2 /24 h, or about 0.1 g/m 2 /24 h.
- the method of measuring the water vapor transmission rate is as follows.
- the water vapor transmission rate (g/m 2 /24h) per 1 m 2 (area of one surface) of the heat-fusible resin layer 4 is measured by the following method.
- the method conforming to ISO15106-5 2008 is adopted, and the measurement is performed under the conditions of temperature 40° C., relative humidity 90%, measurement period 24 hours, and measurement area 8 cm ⁇ using a water vapor transmission rate measuring device by an isobaric method. ..
- Water vapor transmission rate per 1 m 2 is a numerical value is m 2 in terms of the water vapor transmission rate measuring method ISO.
- Examples of the resin having a hydrogen sulfide permeability of 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less include polyester, fluororesin, and cellophane, and preferably polyester and fluororesin.
- Specific examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolyester, and polyethylene terephthalate is preferable.
- the fluororesin preferably includes polytetrafluoroethylene (PTFE), tetrafluoroethylene-ethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), and the like.
- PTFE polytetrafluoroethylene
- ETFE tetrafluoroethylene-ethylene copolymer
- PCTFE polychlorotrifluoroethylene
- the heat-fusible resin layer 4 may be formed of one type of resin alone, or may be formed of a blend polymer in which two or more types of resins are combined. Further, the heat-fusible resin layer 4 may be formed of only one layer, but may be formed of two or more layers of the same or different resin.
- the heat-fusible resin layer 4 may contain a lubricant and the like, if necessary.
- the heat-fusible resin layer 4 contains a lubricant, the moldability of the all-solid-state battery exterior material 10 can be improved.
- the lubricant is not particularly limited, and a known lubricant can be used.
- the lubricant may be used singly or in combination of two or more.
- the lubricant is not particularly limited, but an amide lubricant is preferable. Specific examples of the lubricant include those exemplified for the base material layer 1. The lubricant may be used alone or in combination of two or more.
- a lubricant is present on the surface of the heat-fusible resin layer 4, its amount is not particularly limited, but from the viewpoint of enhancing the moldability of the electronic packaging material, it is preferably about 10 to 50 mg/m 2 . More preferably, it is about 15 to 40 mg/m 2 .
- the lubricant present on the surface of the heat-fusible resin layer 4 may be one in which the lubricant contained in the resin forming the heat-fusible resin layer 4 is exuded, or The surface may be coated with a lubricant.
- the thickness of the heat-fusible resin layer 4 is not particularly limited as long as the heat-fusible resin layers have a function of heat-sealing each other and sealing the battery element. From the viewpoint of effectively suppressing, the thickness is preferably 10 ⁇ m or more, more preferably 20 ⁇ m or more, still more preferably 30 ⁇ m or more.
- the thickness of the heat-fusible resin layer 4 is, for example, about 100 ⁇ m or less, preferably about 85 ⁇ m or less, more preferably about 60 ⁇ m or less, and the preferable range is about 10 to 100 ⁇ m, about 10 to 85 ⁇ m, 10 to Examples include about 60 ⁇ m, about 20 to 100 ⁇ m, about 20 to 85 ⁇ m, about 20 to 60 ⁇ m, about 30 to 100 ⁇ m, about 30 to 85 ⁇ m, and about 30 to 60 ⁇ m.
- the adhesive layer 5 is necessary between the barrier layer 3 (or the barrier layer protective film 3a) and the heat-fusible resin layer 4 in order to firmly bond them. It is a layer provided accordingly.
- the adhesive layer 5 is formed of a resin capable of bonding the barrier layer 3 (or the barrier layer protective film 3a) and the heat-fusible resin layer 4.
- the resin used for forming the adhesive layer 5 for example, the same adhesives as those exemplified for the adhesive layer 2 can be used.
- the resin used for forming the adhesive layer 5 is preferably a resin containing a polyolefin skeleton such as polyolefin or acid-modified polyolefin.
- a polyolefin skeleton such as polyolefin or acid-modified polyolefin.
- the fact that the resin forming the adhesive layer 5 contains a polyolefin skeleton can be analyzed by, for example, infrared spectroscopy, gas chromatography mass spectrometry, or the like.
- infrared spectroscopy gas chromatography mass spectrometry, or the like.
- it is preferable that a peak derived from maleic anhydride is detected.
- a peak derived from maleic acid is detected in the vicinity of the wave number of 1760 cm -1 and near the wave number 1780 cm -1.
- the adhesive layer 5 is a layer composed of maleic anhydride-modified polyolefin
- a peak derived from maleic anhydride is detected when measured by infrared spectroscopy.
- the degree of acid modification is low, the peak may be too small to be detected. In that case, it can be analyzed by nuclear magnetic resonance spectroscopy.
- polystyrene resin examples include polyethylene such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene- ⁇ olefin copolymers; homopolypropylene, polypropylene block copolymers (for example, propylene and Examples thereof include polypropylene block copolymers of ethylene) and polypropylene random copolymers (for example, random copolymers of propylene and ethylene); propylene- ⁇ -olefin copolymers; terpolymers of ethylene-butene-propylene. Of these, polypropylene is preferred.
- the polyolefin resin is a copolymer, it may be a block copolymer or a random copolymer. These polyolefin resins may be used alone or in combination of two or more.
- the polyolefin may be a cyclic polyolefin.
- the cyclic polyolefin is a copolymer of an olefin and a cyclic monomer, and examples of the olefin which is a constituent monomer of the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene and isoprene.
- cyclic monomer which is a constituent monomer of the cyclic polyolefin examples include cyclic alkenes such as norbornene; and cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene and norbornadiene. Of these, cyclic alkenes are preferable, and norbornene is more preferable.
- ⁇ Acid-modified polyolefin is a polymer modified by block or graft polymerization of polyolefin with an acid component.
- the acid-modified polyolefin the above-mentioned polyolefin, a copolymer obtained by copolymerizing the above-mentioned polyolefin with a polar molecule such as acrylic acid or methacrylic acid, or a polymer such as a cross-linked polyolefin can be used.
- the acid component used for acid modification include carboxylic acids such as maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride, or anhydrides thereof.
- the acid-modified polyolefin may be an acid-modified cyclic polyolefin.
- the acid-modified cyclic polyolefin is a polymer obtained by copolymerizing a part of the monomers constituting the cyclic polyolefin in place of the acid component, or by block-polymerizing or graft-polymerizing the acid component with respect to the cyclic polyolefin. is there.
- the acid-modified cyclic polyolefin is the same as described above.
- the acid component used for the acid modification is the same as the acid component used for the modification of the polyolefin.
- Preferred acid-modified polyolefins include polyolefins modified with carboxylic acids or their anhydrides, polypropylene modified with carboxylic acids or their anhydrides, maleic anhydride-modified polyolefins, maleic anhydride-modified polypropylenes.
- the adhesive layer 5 preferably contains an acid-modified polyolefin.
- an acid-modified polyolefin a polyolefin modified with a carboxylic acid or an anhydride thereof, a polypropylene modified with a carboxylic acid or an anhydride thereof, a maleic anhydride modified polyolefin, and a maleic anhydride modified polypropylene are particularly preferable.
- the adhesive layer 5 includes an acid-modified polyolefin and a curing agent. It is more preferable that it is a cured product of the resin composition containing.
- the acid-modified polyolefin those mentioned above can be preferably exemplified.
- the adhesive layer 5 is a cured product of a resin composition containing an acid-modified polyolefin and at least one selected from the group consisting of a compound having an isocyanate group, a compound having an oxazoline group, and a compound having an epoxy group. It is preferable that the cured product be a resin composition containing an acid-modified polyolefin and at least one selected from the group consisting of a compound having an isocyanate group and a compound having an epoxy group.
- the adhesive layer 5 preferably contains at least one selected from the group consisting of polyurethane, polyester, and epoxy resin, and more preferably contains polyurethane and epoxy resin.
- the polyester for example, an amide ester resin is preferable.
- the amide ester resin is generally produced by the reaction of a carboxyl group and an oxazoline group.
- the adhesive layer 5 is more preferably a cured product of a resin composition containing at least one of these resins and the acid-modified polyolefin.
- unreacted compounds such as a compound having an isocyanate group, a compound having an oxazoline group, and a curing agent such as an epoxy resin remain in the adhesive layer 5, the presence of the unreacted product is determined by infrared spectroscopy, for example. It can be confirmed by a method selected from Raman spectroscopy, time-of-flight secondary ion mass spectrometry (TOF-SIMS), and the like.
- the adhesive layer 5 is at least selected from the group consisting of an oxygen atom, a heterocycle, a C ⁇ N bond, and a C—O—C bond. It is preferably a cured product of a resin composition containing one type of curing agent.
- the curing agent having a heterocycle include a curing agent having an oxazoline group and a curing agent having an epoxy group.
- examples of the curing agent having a C—O—C bond include a curing agent having an oxazoline group, a curing agent having an epoxy group, and polyurethane.
- the fact that the adhesive layer 5 is a cured product of a resin composition containing these curing agents means, for example, gas chromatograph mass spectrometry (GCMS), infrared spectroscopy (IR), time-of-flight secondary ion mass spectrometry (TOF). -SIMS), X-ray photoelectron spectroscopy (XPS) and the like.
- GCMS gas chromatograph mass spectrometry
- IR infrared spectroscopy
- TOF time-of-flight secondary ion mass spectrometry
- -SIMS X-ray photoelectron spectroscopy
- the compound having an isocyanate group is not particularly limited, but from the viewpoint of effectively increasing the adhesion between the barrier layer 3 (or the barrier layer protective film 3a) and the adhesive layer 5, a polyfunctional isocyanate compound is preferable. ..
- the polyfunctional isocyanate compound is not particularly limited as long as it is a compound having two or more isocyanate groups.
- Specific examples of the polyfunctional isocyanate-based curing agent include pentane diisocyanate (PDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and polymerization or nurate thereof. And the like, and mixtures thereof and copolymers with other polymers. Moreover, an adduct body, a burette body, an isocyanurate body, etc. are mentioned.
- the content of the compound having an isocyanate group in the adhesive layer 5 is preferably in the range of 0.1 to 50% by mass, and 0.5 to 40% by mass in the resin composition constituting the adhesive layer 5. More preferably, it is in the range. Thereby, the adhesiveness between the barrier layer 3 (or the barrier layer protective film 3a) and the adhesive layer 5 can be effectively enhanced.
- the compound having an oxazoline group is not particularly limited as long as it is a compound having an oxazoline skeleton.
- Specific examples of the compound having an oxazoline group include those having a polystyrene main chain and those having an acrylic main chain. Examples of commercially available products include Epocros series manufactured by Nippon Shokubai Co., Ltd.
- the proportion of the compound having an oxazoline group in the adhesive layer 5 is preferably in the range of 0.1 to 50% by mass, and in the range of 0.5 to 40% by mass in the resin composition constituting the adhesive layer 5. Is more preferable. Thereby, the adhesiveness between the barrier layer 3 (or the barrier layer protective film 3a) and the adhesive layer 5 can be effectively enhanced.
- Examples of compounds having an epoxy group include epoxy resins.
- the epoxy resin is not particularly limited as long as it is a resin capable of forming a crosslinked structure by an epoxy group existing in the molecule, and a known epoxy resin can be used.
- the weight average molecular weight of the epoxy resin is preferably about 50 to 2000, more preferably about 100 to 1000, and further preferably about 200 to 800.
- the weight average molecular weight of the epoxy resin is a value measured by gel permeation chromatography (GPC), which is measured under the condition that polystyrene is used as a standard sample.
- the epoxy resin examples include a glycidyl ether derivative of trimethylolpropane, bisphenol A diglycidyl ether, modified bisphenol A diglycidyl ether, novolac glycidyl ether, glycerin polyglycidyl ether, polyglycerin polyglycidyl ether, and the like.
- the epoxy resins may be used alone or in combination of two or more.
- the ratio of the epoxy resin in the adhesive layer 5 is preferably in the range of 0.1 to 50% by mass, and in the range of 0.5 to 40% by mass in the resin composition constituting the adhesive layer 5. Is more preferable. Thereby, the adhesiveness between the barrier layer 3 (or the barrier layer protective film 3a) and the adhesive layer 5 can be effectively enhanced.
- the polyurethane is not particularly limited, and known polyurethane can be used.
- the adhesive layer 5 may be, for example, a cured product of two-component curing type polyurethane.
- the proportion of polyurethane in the adhesive layer 5 is preferably in the range of 0.1 to 50% by mass, and more preferably 0.5 to 40% by mass in the resin composition constituting the adhesive layer 5. More preferable.
- the adhesive layer 5 is a cured product of a resin composition containing at least one selected from the group consisting of a compound having an isocyanate group, a compound having an oxazoline group, and an epoxy resin, and the acid-modified polyolefin.
- the acid-modified polyolefin functions as the main agent, and the compound having an isocyanate group, the compound having an oxazoline group, and the compound having an epoxy group each function as a curing agent.
- the thickness of the adhesive layer 5 is preferably about 50 ⁇ m or less, about 40 ⁇ m or less, about 30 ⁇ m or less, about 20 ⁇ m or less, about 5 ⁇ m or less, and preferably about 0.1 ⁇ m or more, about 0.5 ⁇ m or more.
- the thickness range is preferably about 0.1 to 50 ⁇ m, about 0.1 to 40 ⁇ m, about 0.1 to 30 ⁇ m, about 0.1 to 20 ⁇ m, about 0.1 to 5 ⁇ m, Examples thereof include about 0.5 to 50 ⁇ m, about 0.5 to 40 ⁇ m, about 0.5 to 30 ⁇ m, about 0.5 to 20 ⁇ m, and about 0.5 to 5 ⁇ m.
- the adhesive exemplified in the adhesive layer 2 or a cured product of an acid-modified polyolefin and a curing agent it is preferably about 1 to 10 ⁇ m, more preferably about 1 to 5 ⁇ m.
- a polyolefin or an acid-modified polyolefin it is preferably about 2 to 50 ⁇ m, more preferably about 10 to 40 ⁇ m.
- the adhesive layer 5 is a cured product of the adhesive exemplified in the adhesive layer 2 or a resin composition containing an acid-modified polyolefin and a curing agent, for example, the resin composition is applied and cured by heating or the like. As a result, the adhesive layer 5 can be formed.
- a polyolefin or an acid-modified polyolefin it can be formed by extrusion molding, for example.
- the exterior material 10 of the present disclosure is, if necessary, on the base material layer 1 (opposite to the barrier layer 3 of the base material layer 1) for the purpose of at least one of improvement in designability, scratch resistance, formability, and the like.
- the surface coating layer 6 may be provided on the side.
- the surface coating layer 6 is a layer located on the outermost layer side of the exterior material 10 when the all-solid-state battery is assembled using the exterior material 10.
- the surface coating layer 6 can be formed of a resin such as polyvinylidene chloride, polyester, polyurethane, acrylic resin, or epoxy resin.
- the resin forming the surface coating layer 6 is a curable resin
- the resin may be either a one-component curing type or a two-component curing type, but is preferably a two-component curing type.
- the two-component curing type resin include two-component curing type polyurethane, two-component curing type polyester, and two-component curing type epoxy resin. Of these, two-component curing type polyurethane is preferable.
- the two-component curing type polyurethane includes, for example, a polyurethane containing a base compound containing a polyol compound and a curing agent containing an isocyanate compound.
- a polyurethane containing a base compound containing a polyol compound and a curing agent containing an isocyanate compound.
- Preferred is a two-component curing type polyurethane having a polyol such as a polyester polyol, a polyether polyol, and an acrylic polyol as a main component and an aromatic or aliphatic polyisocyanate as a curing agent.
- the polyol compound it is preferable to use a polyester polyol having a hydroxyl group at the side chain in addition to the hydroxyl group at the terminal of the repeating unit.
- the surface coating layer 6 may be provided on at least one of the surface and the inside of the surface coating layer 6 depending on the surface coating layer 6 and the functionality to be provided on the surface, and if necessary, the above-mentioned lubricant or anti-reflective agent. It may contain additives such as a blocking agent, a matting agent, a flame retardant, an antioxidant, a tackifier, and an antistatic agent. Examples of the additive include fine particles having an average particle diameter of about 0.5 nm to 5 ⁇ m. The average particle size of the additive is the median size measured by a laser diffraction/scattering type particle size distribution measuring device.
- the additive may be an inorganic substance or an organic substance.
- the shape of the additive is not particularly limited, and examples thereof include spherical shape, fibrous shape, plate shape, amorphous shape, and scale shape.
- the additive include talc, silica, graphite, kaolin, montmorillonite, mica, hydrotalcite, silica gel, zeolite, aluminum hydroxide, magnesium hydroxide, zinc oxide, magnesium oxide, aluminum oxide, neodymium oxide, antimony oxide.
- Titanium oxide, cerium oxide, calcium sulfate, barium sulfate, calcium carbonate, calcium silicate, lithium carbonate, calcium benzoate, calcium oxalate, magnesium stearate, alumina, carbon black, carbon nanotubes, high melting point nylon, acrylate resin examples include crosslinked acrylic, crosslinked styrene, crosslinked polyethylene, benzoguanamine, gold, aluminum, copper and nickel.
- the additives may be used alone or in combination of two or more.
- silica, barium sulfate and titanium oxide are preferable from the viewpoint of dispersion stability and cost.
- the surface of the additive may be subjected to various surface treatments such as insulation treatment and high dispersibility treatment.
- the method of forming the surface coating layer 6 is not particularly limited, and examples thereof include a method of applying a resin forming the surface coating layer 6.
- a resin mixed with the additive may be applied.
- the thickness of the surface coating layer 6 is not particularly limited as long as it exhibits the above-mentioned functions as the surface coating layer 6, and is, for example, about 0.5 to 10 ⁇ m, preferably about 1 to 5 ⁇ m.
- the method for manufacturing the all-solid-state battery exterior material 10 is not particularly limited as long as a laminated body obtained by laminating the layers included in the all-solid-state battery exterior material 10 of the present disclosure is obtained, and at least from the outside, the base material layer. 1, a barrier layer 3 and a heat-fusible resin layer 4 may be laminated in this order.
- the base material layer 1, the adhesive layer 2, and the barrier layer 3 (a laminated body in which the barrier layer protective film 3a and/or is laminated as needed (hereinafter, also referred to as "laminated body A")
- the laminate A is formed by using an adhesive used for forming the adhesive layer 2 on the base material layer 1 or on the barrier layer 3 whose surface is subjected to chemical conversion treatment, if necessary. It can be carried out by a dry laminating method in which the barrier layer 3 or the base material layer 1 is laminated and the adhesive layer 2 is cured after being coated and dried by a coating method such as a gravure coating method or a roll coating method.
- the heat-fusible resin layer 4 is laminated on the barrier layer 3 of the laminate A.
- the resin component forming the heat-fusible resin layer 4 is gravure-coated or roll-coated on the barrier layer 3 of the laminate A. It may be applied by such a method.
- the adhesive layer 5 is provided between the barrier layer 3 and the heat-fusible resin layer 4, for example, (1) the adhesive layer 5 and the heat-fusible resin layer are provided on the barrier layer 3 of the laminate A.
- Method of laminating by co-extruding 4 (co-extrusion laminating method), (2) Separately, a laminated body in which the adhesive layer 5 and the heat-fusible resin layer 4 are laminated is formed, and this is a barrier layer of the laminated body A. 3 by a thermal lamination method, (3) a method of extruding or solution coating an adhesive for forming the adhesive layer 5 on the barrier layer 3 of the laminate A, drying at high temperature, and further baking.
- a method of laminating the heat-fusible resin layer 4 formed in a sheet shape on the adhesive layer 5 in advance by a thermal lamination method, and (4) the barrier layer 3 of the laminate A and a sheet shape in advance.
- the surface coating layer is laminated on the surface of the base material layer 1 opposite to the barrier layer 3.
- the surface coating layer can be formed, for example, by applying the above-mentioned resin forming the surface coating layer to the surface of the base material layer 1.
- the order of the step of laminating the barrier layer 3 on the surface of the base material layer 1 and the step of laminating the surface coating layer on the surface of the base material layer 1 is not particularly limited.
- the barrier layer 3 may be formed on the surface of the base material layer 1 opposite to the surface coating layer.
- a laminate including the provided adhesive layer 5/heat-fusible resin layer 4 in this order is formed, and in order to strengthen the adhesiveness of the adhesive layer 2 and the adhesive layer 5 provided as necessary, It may be subjected to heat treatment such as hot roll contact type, hot air type, near infrared ray type or far infrared ray type.
- the conditions for such heat treatment include, for example, about 150 to 250° C. and about 1 to 5 minutes.
- the all-solid-state battery exterior material 10 for each layer constituting the laminated body, if necessary, film forming property, lamination processing, final product secondary processing (pouching, embossing) suitability, etc. are improved or stabilized.
- surface activation treatment such as corona treatment, blast treatment, oxidation treatment and ozone treatment may be performed.
- corona treatment on at least one surface of the base material layer 1, film-forming properties, lamination processing, suitability for secondary processing of final products, etc. can be improved or stabilized.
- the printability of the ink on the surface of the base material layer 1 can be improved.
- Nitrogen gas of 50 ml/min is ventilated from the vent 101 of the separable flask upper part 100, and hydrogen sulfide gas (H 2 S concentration of 20 ⁇ 5 volume ppm/N 2 is ventilated from the vent 201 of the separable flask lower part 200. ) Aeration of 50 ml/min.
- a resin bag is connected to the vent 101 of the separable flask upper part 100, and 0.5 L of sample gas is sampled in 10 minutes. Sampling conditions: After 48 hours have passed, a total of once (4) the concentration of the sample gas collected in the resin bag is measured with a gas chromatograph-flame photometric detector (GC-FPD).
- GC-FPD gas chromatograph-flame photometric detector
- Water vapor transmission rate per 1 m 2 > The water vapor transmission rate (g/m 2 /24h) per 1 m 2 (area of one surface) of each resin film used for measuring the amount of hydrogen sulfide permeation was measured by the following method. Adopting the method conforming to ISO15106-5 2008, under the measurement conditions of temperature 40° C., relative humidity 90%, measurement period 24 hours, and measurement area 8 cm ⁇ , a water vapor transmission rate measuring device (manufactured by MOCON) It was measured using a device name PERMATRAN). Water vapor transmission rate per 1 m 2 is a numerical value is m 2 in terms of the water vapor transmission rate measuring method ISO. The results are shown in Table 1.
- Example 1 As the base material layer, a polyethylene terephthalate film (12 ⁇ m)/adhesive layer (two-component curing type urethane adhesive (polyol compound and aromatic isocyanate compound), thickness 3 ⁇ m)/biaxially stretched nylon film (thickness 15 ⁇ m) are provided in this order. A laminated laminated film was prepared. A barrier layer made of aluminum alloy foil (JIS H4160:1994 A8021H-O, thickness 40 ⁇ m) was prepared. Both sides of the barrier layer were subjected to chemical conversion treatment by the method described below to form a barrier layer protective film (thickness 10 nm). Next, the barrier layer and the base material layer were laminated by a dry laminating method.
- a two-component curable urethane adhesive (polyol compound and aromatic isocyanate compound) is applied to one surface of the barrier layer protective film formed on the surface of the barrier layer, and the adhesive layer (thickness after curing) is applied. 3 ⁇ m) was formed. Then, after laminating the adhesive layer and the biaxially stretched nylon film, aging treatment was performed to produce a laminate of base material layer/adhesive layer/barrier layer protective film/barrier layer/barrier layer protective film. ..
- a two-component curing type urethane adhesive (polyol compound and aromatic isocyanate compound) as an adhesive layer, and a thickness after curing of 3 ⁇ m) and heat fusion
- the polytetrafluoroethylene film of Table 1 thickness 50 ⁇ m as a heat-resistant resin layer was laminated, and an adhesive layer/heat-fusible resin layer was laminated.
- the obtained laminate is aged and heated to give a substrate layer (polyethylene terephthalate film (12 ⁇ m)/adhesive layer (3 ⁇ m)/biaxially stretched nylon film (15 ⁇ m))/adhesive layer (3 ⁇ m )/Barrier layer protective film (10 nm)/barrier layer (40 ⁇ m)/barrier layer protective film (10 nm)/adhesive layer (3 ⁇ m)/heat-fusible resin layer (50 ⁇ m) I got the material.
- the formation of the barrier layer protective film on both sides of the barrier layer was performed as follows.
- a treatment liquid containing 43 parts by weight of aminated phenol polymer, 16 parts by weight of chromium fluoride, and 13 parts by weight of phosphoric acid was prepared with respect to 100 parts by weight of water, and the treatment liquid was applied to both surfaces of the barrier layer (after drying).
- the barrier layer has a surface temperature of about 190 to 230° C. for about 3 to 6 seconds.
- Example 2 A base material layer (polyethylene terephthalate film (12 ⁇ m)/adhesive layer (3 ⁇ m) was used in the same manner as in Example 1 except that the polyethylene terephthalate film (thickness 50 ⁇ m) shown in Table 1 was used as the heat-fusible resin layer.
- a packaging material was obtained, which was composed of a laminated body in which the functional resin layers (40 ⁇ m) were laminated in this order.
- Example 3 A substrate layer (polyethylene terephthalate film (12 ⁇ m)/adhesive layer (3 ⁇ m)/biaxially stretched nylon film (in the same manner as in Example 1 except that the barrier layer protective film was not formed on the surface of the barrier layer). 15 ⁇ m))/adhesive layer (3 ⁇ m)/barrier layer (40 ⁇ m)/adhesive layer (3 ⁇ m)/heat-fusible resin layer (50 ⁇ m) were laminated in this order to obtain a packaging material.
- Example 4 A substrate layer (polyethylene terephthalate film (12 ⁇ m)/adhesive layer (3 ⁇ m)/biaxially stretched nylon film (in the same manner as in Example 2 except that the barrier layer protective film was not formed on the surface of the barrier layer). 15 ⁇ m))/adhesive layer (3 ⁇ m)/barrier layer (40 ⁇ m)/adhesive layer (3 ⁇ m)/heat-fusible resin layer (50 ⁇ m) were laminated in this order to obtain a packaging material.
- the analysis of the barrier layer protective film was performed as follows. First, the barrier layer and the adhesive layer were peeled off. At this time, physical peeling was performed without using water, an organic solvent, an acid or alkali aqueous solution, or the like. After peeling between the barrier layer and the adhesive layer, since the adhesive layer remained on the surface of the barrier layer, the remaining adhesive layer was removed by etching with Ar-GCIB. With respect to the surface of the barrier layer thus obtained, the barrier layer protective film was analyzed by using the time-of-flight secondary ion mass spectrometry.
- Measuring device Time-of-flight secondary ion mass spectrometer TOF. manufactured by ION-TOF.
- SIMS 5 Measurement condition
- Primary ion Double-charged bismuth cluster ion (Bi 3 ++ ).
- Primary ion acceleration voltage 30 kV Mass range (m/z): 0 to 1500 Measuring range: 100 ⁇ m ⁇ 100 ⁇ m Number of scans: 16 scan/cycle Number of pixels (1 side): 256 pixels
- Etching ions Ar gas cluster ion beam (Ar-GCIB) Etching ion acceleration voltage: 5.0 kV
- a hole having a diameter of 1 mm was formed on the heat-fusible resin layer side of the exterior material so that the surface of the barrier layer protective film was exposed.
- the heat-fusible resin layer one having a hole of ⁇ 1 mm formed so that the surface of the barrier layer protective film was exposed was used to prepare an exterior material.
- Item 1 At least, from the outside, a base material layer, a barrier layer, and a heat-fusible resin layer, which is composed of a laminated body in this order, for use in an all-solid-state battery containing a sulfide solid electrolyte material, an all-solid-state battery exterior material And A packaging material for an all-solid-state battery, wherein the resin forming the heat-fusible resin layer has a hydrogen sulfide permeation amount of 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less.
- Item 2. Item 2.
- Item 3. Item 3. The all-solid-state battery outer packaging material according to Item 1 or 2, wherein the base material layer comprises a polyester, an adhesive layer, and a polyamide in this order from the outside.
- Item 4. Item 3. The all-solid-state battery exterior material according to Item 1 or 2, wherein the base material layer is composed of a single layer of polyester resin.
- the laminate has a barrier layer protective film formed on the surface of the barrier layer, When the barrier layer protective film is analyzed by time-of-flight secondary ion mass spectrometry, the ratio of the peak intensity P PO3 derived from PO 3 ⁇ to the peak intensity P Cr3 derived from CrPO 4 ⁇ P PO3 / Item 6.
- An all-solid-state battery packaging body obtained by molding the all-solid-state battery packaging material according to any one of Items 1 to 6.
- a battery element including at least a unit cell including a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer laminated between the positive electrode active material layer and the negative electrode active material layer is an exterior for an all-solid-state battery.
- the solid electrolyte layer contains a sulfide solid electrolyte material,
- the all-solid-state battery exterior material, at least from the outside, a base material layer, a barrier layer, and a heat-fusible resin layer is composed of a laminate provided in this order,
- a step of obtaining a laminate by laminating the base material layer, the barrier layer, and the heat fusible resin layer in this order The resin forming the heat-fusible resin layer has a hydrogen sulfide permeation amount of 1.0 ⁇ 10 ⁇ 9 cc ⁇ mm/cm 2 ⁇ sec ⁇ cmHg or less, A method for producing an all-solid-state battery casing material for use in an all-solid-state battery containing a sulfide solid electrolyte material.
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Abstract
Description
少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成された、硫化物固体電解質材料を含む全固体電池に用いるための全固体電池用外装材であって、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である、全固体電池用外装材。
本開示の全固体電池用外装材10は、例えば図4から図9に示すように、少なくとも、外側から、基材層1、バリア層3、及び熱融着性樹脂層4をこの順に備える積層体から構成されている。全固体電池用外装材10において、熱融着性樹脂層4は最内層になる。全固体電池用外装材10と電池素子を用いて全固体電池を組み立てる際に、全固体電池用外装材10の熱融着性樹脂層4同士を対向させた状態で、周縁部を熱融着させることによって形成された空間に、電池素子が収容される。なお、本開示の全固体電池用外装材10が適用される全固体電池において、電池素子が収容されている空間(凹部)の熱融着された周縁部は、金属端子が存在している部分を除き、平坦であることが好ましい。また、本開示の全固体電池用外装材10が適用される全固体電池において、電池素子が収容されている空間(凹部)の周縁部には、硫化水素を吸収するための物質(熱融着性樹脂層を構成する樹脂とは異なる、硫化水素吸水物質)を配する必要がない。
本開示の全固体電池用外装材10(以下、「外装材10」と表記することがある)が適用される全固体電池については、固体電解質層40が硫化物固体電解質材料を含むことと、特定の外装材10を用いることを除いて、特に制限されない。すなわち、固体電解質層40と外装材10以外の構成(電極、端子など)等については、全固体電池に適用されるものであれば特に制限されず、公知の全固体電池に使用されているものであってもよい。以下、本開示の全固体電池70を例にして、本開示の全固体電池用外装材10を全固体電池に適用する態様を具体的に説明する。
正極活物質層31は、少なくとも正極活物質を含有する層である。正極活物質層31は、正極活物質に加えて、必要に応じて、固体電解質材料、導電化材、結着材などをさらに含んでいてもよい。
正極集電体32を構成する材料としては、例えばステンレス鋼(SUS)、アルミニウム、ニッケル、鉄、チタン、カーボンなどが挙げられる。
負極活物質層21は、少なくとも負極活物質を含有する層である。負極活物質層21は、負極活物質に加えて、必要に応じて、固体電解質材料、導電化材、結着材などを含んでいてもよい。
負極集電体22を構成する材料としては、例えばステンレス鋼(SUS)、銅、ニッケル、カーボン等が挙げられる。
固体電解質層40は、硫化物固体電解質材料を含有する層である。
本開示の外装材10は、少なくとも、外側から、基材層1、バリア層3、及び熱融着性樹脂層4をこの順に備える積層体から構成されており、さらに、熱融着性樹脂層4を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である。以下、本開示の外装材10を構成する各層について、詳述する。
本開示において、基材層1は、外装材10の基材としての機能を発揮させることなどを目的として、バリア層3の外側(バリア層保護膜3bを有する場合には、バリア層保護膜3bの外側)に、必要に応じて設けられる層である。基材層1は、外装材10の外層側に位置する。
外装材10において、接着剤層2は、基材層1とバリア層3との接着性(バリア層保護膜3bを有する場合には、基材層1とバリア層保護膜3bとの接着性)を高めることを目的として、必要に応じて、これらの間に設けられる層である。
着色層は、基材層1とバリア層3(又はバリア層保護膜3b)との間に必要に応じて設けられる層である(図示を省略する)。接着剤層2を有する場合には、基材層1と接着剤層2との間、接着剤層2とバリア層3(又はバリア層保護膜3b)との間に着色層を設けてもよい。また、基材層1の外側に着色層を設けてもよい。着色層を設けることにより、外装材10を着色することができる。
外装材10において、バリア層3は、少なくとも水分の浸入を抑止する層である。
外装材10においては、バリア層3の熱融着性樹脂層4側の表面にバリア層保護膜3aを備えていることが好ましい。また、バリア層3の基材層1側の表面にバリア層保護膜3bを備えていることも好ましい。外装材10においては、例えばバリア層3の熱融着性樹脂層4側の表面のみに、バリア層保護膜3aを備えていてもよいし、バリア層3の両面に、それぞれ、バリア層保護膜3a,3bを備えていてもよい。
1次イオン:ビスマスクラスターのダブルチャージイオン(Bi3 ++)
1次イオン加速電圧:30 kV
質量範囲(m/z):0~1500
測定範囲:100μm×100μm
スキャン数:16 scan/cycle
ピクセル数(1辺):256 pixel
エッチングイオン:Arガスクラスターイオンビーム(Ar-GCIB)
エッチングイオン加速電圧:5.0 kV
本開示の全固体電池用外装材10において、熱融着性樹脂層4は、最内層に該当し、全固体電池の組み立て時に熱融着性樹脂層4同士が熱融着して電池素子を密封する機能を発揮する層(シーラント層)である。
熱融着性樹脂層4の1m2(片面の面積)当たりの水蒸気透過率(g/m2/24h)を以下の方法で測定する。ISO15106-5 2008年の規定に準拠した方法を採用し、温度40℃、相対湿度90%、測定期間24時間、測定面積8cmφの測定条件において、等圧法による水蒸気透過率測定装置を用いて測定する。1m2当たりの水蒸気透過率は、ISOの水蒸気透過率測定方法によりm2換算された数値である。
本開示の全固体電池用外装材10において、接着層5は、バリア層3(又はバリア層保護膜3a)と熱融着性樹脂層4を強固に接着させるために、これらの間に必要に応じて設けられる層である。
本開示の外装材10は、意匠性、耐傷性、成形性などの向上の少なくとも一つを目的として、必要に応じて、基材層1の上(基材層1のバリア層3とは反対側)に、表面被覆層6を備えていてもよい。表面被覆層6は、外装材10を用いて全固体電池を組み立てた時に、外装材10の最外層側に位置する層である。
図9の模式図に示すように、試験温度(概ね23±5℃)の環境において、全固体電池用外装材の熱融着性樹脂層として使用する各樹脂フィルム(表1に記載の厚さ)をサンプルとして、以下の手順に従い、熱融着性樹脂層を構成する樹脂の硫化水素透過量を求めた。結果を表1に示す。
(1)セパラブルフラスコ上部100と、セパラブルフラスコ下部200の間に、サンプルAを設置する。
(2)セパラブルフラスコ上部100の通気口101から、窒素ガス50ml/minを通気させ、セパラブルフラスコ下部200の通気口201から、硫化水素ガス(H2S濃度20±5体積ppm/N2)50ml/minを通気させる。
(3)以下のサンプリング条件にて、セパラブルフラスコ上部100の通気口101に樹脂バッグを接続し、10分間で0.5Lの試料ガスを採取する。
サンプリング条件:48時間経過後、計1回採取
(4)樹脂バッグに捕集した試料ガス濃度を、ガスクロマトグラフ-炎光光度検出器(GC-FPD)で測定する。
(5)測定により得られた試料ガス濃度(体積ppb)より、下記計算式1を用いて1時間当たりの透過量(nL/hr)を算出し、下記計算式2を用いて透過度(cc/m2・day)を算出する。単位はcc・mm/cm2・sec・cmHgに換算する。
計算式1:透過量(nL/hr)=濃度(体積ppb≒nL/L)×時間当たりの採取ガス量(L/hr)
試験流量50mL/minのため、時間当たりの採取ガス量は3Lとなる。
計算式2:透過度(cc/m2・day)=透過量(nL/hr)×24(hr)/106/有効試験面積(m2)
有効試験面積は、セパラブルフラスコ開口部面積0.00465m2を用いる。
硫化水素透過量の測定に用いた各樹脂フィルムの1m2(片面の面積)当たりの水蒸気透過率(g/m2/24h)を以下の方法で測定した。ISO15106-5 2008年の規定に準拠した方法を採用し、温度40℃、相対湿度90%、測定期間24時間、測定面積8cmφの測定条件において、等圧法による水蒸気透過率測定装置(MOCON社製の装置名PERMATRAN)を用いて測定した。1m2当たりの水蒸気透過率は、ISOの水蒸気透過率測定方法によりm2換算された数値である。結果を表1に示す。
基材層(30μm)/接着剤層(3μm)/バリア層(40μm)/熱融着性樹脂層(表1に記載の樹脂フィルムの厚み)がこの順に積層された積層体からなる2枚の外装材(縦3.00mm、横1.50mmの平面視矩形状)について、周縁部(4辺)を幅3mmで熱融着させた(熱融着部においては、各熱融着性樹脂層の厚さが95%に減少している)全固体電池を想定し、前記の<熱融着性樹脂層を構成する樹脂の硫化水素透過量>で得られた硫化水素透過量の値を用いて、熱融着性樹脂層からの10年間の硫化水素の漏れ(硫化水素の透過量 cc)を計算した。なお、当該計算において、バリア層は硫化水素透過量が0ccであるとし、熱融着性樹脂層の熱融着部から硫化水素が透過するとして、計算を行った。結果を表1に示す。
基材層として、ポリエチレンテレフタレートフィルム(12μm)/接着剤層(2液硬化型ウレタン接着剤(ポリオール化合物と芳香族イソシアネート化合物)、厚さ3μm)/二軸延伸ナイロンフィルム(厚さ15μm)が順に積層された積層フィルムを用意した。また、アルミニウム合金箔(JIS H4160:1994 A8021H-O、厚さ40μm)からなるバリア層を用意した。バリア層の両面には、後述の方法で化成処理を施して、バリア層保護膜(厚さ10nm)を形成した。次に、バリア層と基材層をドライラミネート法により積層させた。具体的には、バリア層の表面に形成されたバリア層保護膜の一方面に、2液硬化型ウレタン接着剤(ポリオール化合物と芳香族イソシアネート化合物)を塗布し、接着剤層(硬化後の厚み3μm)を形成した。次いで、接着剤層と二軸延伸ナイロンフィルムを積層した後、エージング処理を実施することにより、基材層/接着剤層/バリア層保護膜/バリア層/バリア層保護膜の積層体を作製した。次に、得られた積層体のバリア層保護膜の上に、接着層としての2液硬化型ウレタン接着剤(ポリオール化合物と芳香族イソシアネート化合物)、硬化後の厚さ3μm)と、熱融着性樹脂層としての表1のポリテトラフルオロエチレンフィルム(厚さ50μm)を積層して、接着層/熱融着性樹脂層を積層させた。次に、得られた積層体をエージングし、加熱することにより、基材層(ポリエチレンテレフタレートフィルム(12μm)/接着剤層(3μm)/二軸延伸ナイロンフィルム(15μm))/接着剤層(3μm)/バリア層保護膜(10nm)/バリア層(40μm)/バリア層保護膜(10nm)/接着層(3μm)/熱融着性樹脂層(50μm)がこの順に積層された積層体からなる外装材を得た。
熱融着性樹脂層として、表1のポリエチレンテレフタレートフィルム(厚さ50μm)を用いたこと以外は、実施例1と同様にして、基材層(ポリエチレンテレフタレートフィルム(12μm)/接着剤層(3μm)/二軸延伸ナイロンフィルム(15μm))/接着剤層(3μm)/バリア層保護膜(10nm)/バリア層(40μm)/バリア層保護膜(10nm)/接着層(3μm)/熱融着性樹脂層(40μm)がこの順に積層された積層体からなる外装材を得た。
バリア層の表面にバリア層保護膜を形成しなかったこと以外は、実施例1と同様にして、基材層(ポリエチレンテレフタレートフィルム(12μm)/接着剤層(3μm)/二軸延伸ナイロンフィルム(15μm))/接着剤層(3μm)/バリア層(40μm)/接着層(3μm)/熱融着性樹脂層(50μm)がこの順に積層された積層体からなる外装材を得た。
バリア層の表面にバリア層保護膜を形成しなかったこと以外は、実施例2と同様にして、基材層(ポリエチレンテレフタレートフィルム(12μm)/接着剤層(3μm)/二軸延伸ナイロンフィルム(15μm))/接着剤層(3μm)/バリア層(40μm)/接着層(3μm)/熱融着性樹脂層(50μm)がこの順に積層された積層体からなる外装材を得た。
バリア層保護膜の分析は、次のようにして行った。まず、バリア層と接着層との間を引き剥がした。この際、水や有機溶剤、酸やアルカリの水溶液などを利用せずに、物理的に剥離させた。バリア層と接着層との間を剥離した後には、バリア層の表面に接着層が残存していたため、残存している接着層をAr-GCIBによるエッチングで除去した。このようにして得られたバリア層の表面について、飛行時間型2次イオン質量分析法を用いて、バリア層保護膜の分析を行った。それぞれ、CrPO4 -、PO2 -、及びPO3 -に由来するピーク強度PCrPO4、PPO2、PPO3、と、ピーク強度PCrPO4に対するピーク強度PPO2の比PPO2/CrPO4と、ピーク強度PCrPO4に対するピーク強度PPO3の比PPO3/CrPO4を、それぞれ、表1に示す。なお、実施例3,4においては、バリア層の表面にバリア層保護膜が形成されていないため、表1には、CrPO4 -のピーク強度PCrPO4に関する項目について「-」で示した。
(測定条件)
1次イオン:ビスマスクラスターのダブルチャージイオン(Bi3 ++)
1次イオン加速電圧:30 kV
質量範囲(m/z):0~1500
測定範囲:100μm×100μm
スキャン数:16 scan/cycle
ピクセル数(1辺):256 pixel
エッチングイオン:Arガスクラスターイオンビーム(Ar-GCIB)
エッチングイオン加速電圧:5.0 kV
外装材の熱融着性樹脂層側に、バリア層保護膜の表面が露出するようにして、φ1mmの孔を空けた。具体的には、前記の実施例1~4において、熱融着性樹脂層として、バリア層保護膜の表面が露出するようにしてφ1mmの孔が空けたものを用いて外装材を作製した。これら各外装材を、それぞれ試験片とし、試験片とリチウムインジウム合金(LiIn合金)との間に、硫化物固体電解質(Li2S:P2S5=75:25、厚み300μm)を配した状態で高圧プレス(50MPa)を加えた。このとき、外装材のφ1mmの孔が空けられている箇所に、硫化物固体電解質が位置するように配置した。なお、実施例3,4ではバリア層保護膜を設けていないため、バリア層の表面が露出するようにした。この状態で、試験片のバリア層と、LiIn合金との間に0.53Vの電圧を加えて1時間静置した。1時間経過後、試験片のφ1mmの孔が空けられている箇所のバリア層の表面を顕微鏡で観察して、バリア層の表面に合金が形成されているか否かを確認した。バリア層の表面に合金が形成されていない場合を評価A、合金が形成されている場合を評価Cとした。結果を表2に示す。
項1. 少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成された、硫化物固体電解質材料を含む全固体電池に用いるための全固体電池用外装材であって、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である、全固体電池用外装材。
項2. 前記熱融着性樹脂層の厚みが、10μm以上である、項1に記載の全固体電池用外装材。
項3. 前記基材層は、外側から、ポリエステル、接着剤層、及びポリアミドをこの順に備える、項1又は2に記載の全固体電池用外装材。
項4. 前記基材層は、ポリエステル樹脂の単層により構成されている、項1又は2に記載の全固体電池用外装材。
項5. 前記熱融着性樹脂層を構成する樹脂は、ポリエステル又はフッ素樹脂である、項1~4のいずれか1項に記載の全固体電池用外装材。
項6. 前記積層体は、前記バリア層の表面に形成されたバリア層保護膜を有しており、
前記バリア層保護膜について、飛行時間型2次イオン質量分析法を用いて分析した場合に、CrPO4 -に由来するピーク強度PCrPO4に対するPO3 -に由来するピーク強度PPO3の比PPO3/CrPO4が、6以上120以下の範囲内にある、項1~5のいずれかに記載の全固体電池用外装材。
項7. 項1~6のいずれか1項に記載の全固体電池用外装材が成形されてなる、全固体電池用包装体。
項8. 正極活物質層と、負極活物質層と、前記正極活物質層と前記負極活物質層との間に積層された固体電解質層とを含む単電池を少なくとも含む電池素子が、全固体電池用外装材により形成された包装体中に収容された全固体電池であって、
前記固体電解質層は、硫化物固体電解質材料を含み、
前記全固体電池用外装材は、少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成されており、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である、全固体電池。
項9. 少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層がこの順となるように積層して積層体を得る工程を備えており、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下であり、
硫化物固体電解質材料を含む全固体電池に用いるための、全固体電池用外装材の製造方法。
2 接着剤層
3 バリア層
3a、3b バリア層保護膜
4 熱融着性樹脂層
5 接着層
10 全固体電池用外装材
20 負極層
21 負極活物質層
22 負極集電体
30 正極層
31 正極活物質層
32 正極集電体
40 固体電解質層
50 単電池
60 端子
70 全固体電池
Claims (9)
- 少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成された、硫化物固体電解質材料を含む全固体電池に用いるための全固体電池用外装材であって、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である、全固体電池用外装材。 - 前記熱融着性樹脂層の厚みが、10μm以上である、請求項1に記載の全固体電池用外装材。
- 前記基材層は、外側から、ポリエステル、接着剤層、及びポリアミドをこの順に備える、請求項1又は2に記載の全固体電池用外装材。
- 前記基材層は、ポリエステル樹脂の単層により構成されている、請求項1又は2に記載の全固体電池用外装材。
- 前記熱融着性樹脂層を構成する樹脂は、ポリエステル又はフッ素樹脂である、請求項1~4のいずれか1項に記載の全固体電池用外装材。
- 前記積層体は、前記バリア層の表面に形成されたバリア層保護膜を有しており、
前記バリア層保護膜について、飛行時間型2次イオン質量分析法を用いて分析した場合に、CrPO4 -に由来するピーク強度PCrPO4に対するPO3 -に由来するピーク強度PPO3の比PPO3/CrPO4が、6以上120以下の範囲内にある、請求項1~5のいずれかに記載の全固体電池用外装材。 - 請求項1~6のいずれか1項に記載の全固体電池用外装材が成形されてなる、全固体電池用包装体。
- 正極活物質層と、負極活物質層と、前記正極活物質層と前記負極活物質層との間に積層された固体電解質層とを含む単電池を少なくとも含む電池素子が、全固体電池用外装材により形成された包装体中に収容された全固体電池であって、
前記固体電解質層は、硫化物固体電解質材料を含み、
前記全固体電池用外装材は、少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層をこの順に備える積層体から構成されており、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下である、全固体電池。 - 少なくとも、外側から、基材層、バリア層、及び熱融着性樹脂層がこの順となるように積層して積層体を得る工程を備えており、
前記熱融着性樹脂層を構成する樹脂の硫化水素透過量が、1.0×10-9cc・mm/cm2・sec・cmHg以下であり、
硫化物固体電解質材料を含む全固体電池に用いるための、全固体電池用外装材の製造方法。
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| US17/424,535 US12401057B2 (en) | 2019-01-23 | 2020-01-23 | Exterior material for all-solid-state battery, method for manufacturing same, and all-solid-state battery |
| CN202410986796.6A CN118919963A (zh) | 2019-01-23 | 2020-01-23 | 全固体电池用外包装材料、其制造方法和全固体电池 |
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| JP7151942B1 (ja) * | 2020-12-02 | 2022-10-12 | 大日本印刷株式会社 | 全固体電池の製造に用いられる工程フィルム、及び全固体電池の製造方法 |
| JP2024113684A (ja) * | 2021-12-07 | 2024-08-22 | 大日本印刷株式会社 | 蓄電デバイス用包装フィルム及び蓄電デバイス |
| JP7655416B2 (ja) | 2021-12-07 | 2025-04-02 | 大日本印刷株式会社 | 蓄電デバイス用包装フィルム及び蓄電デバイス |
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| CN113316860B (zh) | 2024-08-09 |
| US12401057B2 (en) | 2025-08-26 |
| JP6747636B1 (ja) | 2020-08-26 |
| JP2020188020A (ja) | 2020-11-19 |
| EP3916874A4 (en) | 2024-08-21 |
| CN113316860A (zh) | 2021-08-27 |
| KR102874996B1 (ko) | 2025-10-21 |
| US20220069344A1 (en) | 2022-03-03 |
| JPWO2020153458A1 (ja) | 2021-02-18 |
| EP3916874A1 (en) | 2021-12-01 |
| KR20210116442A (ko) | 2021-09-27 |
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