WO2012008414A1 - 電気化学セル用包装材料 - Google Patents
電気化学セル用包装材料 Download PDFInfo
- Publication number
- WO2012008414A1 WO2012008414A1 PCT/JP2011/065801 JP2011065801W WO2012008414A1 WO 2012008414 A1 WO2012008414 A1 WO 2012008414A1 JP 2011065801 W JP2011065801 W JP 2011065801W WO 2012008414 A1 WO2012008414 A1 WO 2012008414A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- fluorine
- packaging material
- chemical conversion
- electrochemical cell
- Prior art date
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- 125000001309 chloro group Chemical group Cl* 0.000 claims abstract description 4
- -1 phosphorus compound Chemical class 0.000 claims description 70
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Images
Classifications
-
- 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
- H01M50/121—Organic material
-
- 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
-
- 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
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
- B32B2307/7246—Water vapor barrier
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
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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
- B32B2323/00—Polyalkenes
- B32B2323/10—Polypropylene
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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
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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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
Definitions
- the present invention relates to a packaging material for electrochemical cells, and more particularly, to a packaging material for electrochemical cells that has excellent environmental performance and exhibits stable laminate strength, sealing strength, electrolytic solution resistance, water vapor barrier properties, moldability, and insulation properties. Is.
- the lithium ion battery is also referred to as a lithium secondary battery, and includes a liquid, gel-like or polymer polymer electrolyte, and a cathode / negative electrode active material made of a polymer polymer.
- the configuration of the lithium ion battery is composed of a battery body composed of a positive electrode current collector / positive electrode active material layer / electrolyte layer / negative electrode active material layer / negative electrode current collector and an exterior body that wraps the battery body to form an exterior body.
- a multilayer film is used as a packaging material.
- FIG. 2 is a cross-sectional view showing the layer structure of the conventional packaging material for electrochemical cells described in Patent Document 1, and as shown in FIG.
- the metal foil layer 212, the chemical conversion treatment layer 213, the adhesive layer 214, and the heat-adhesive resin layer 215 are sequentially laminated.
- the adhesive layer 214 is a dry component containing a polyolefin polyol and a polyfunctional isocyanate curing agent as essential components. Lamination adhesive is used.
- the adhesive for dry lamination that constitutes the adhesive layer 214 contains a chlorine component, so in order to supply products with excellent environmental performance, the laminate strength of the packaging material for electrochemical cells while reducing the chlorine content It was necessary to maintain sealing strength, electrolytic solution resistance, moldability and insulation.
- the present invention provides a packaging material for an electrochemical cell that is excellent in environmental performance and is excellent in stable laminate strength, seal strength, electrolytic solution resistance, water vapor barrier property, moldability, and insulation. For the purpose.
- the first configuration of the present invention includes a base material layer, a metal foil layer, a chemical conversion treatment layer formed on the surface of the metal foil layer, an adhesive layer, and a thermal adhesive resin layer.
- an adhesive layer is formed of a main material including a fluorine-containing copolymer and a curing agent, and the fluorine-containing copolymer is chlorine. It is characterized by not containing a group.
- the chlorine component contained in the main material constituting the adhesive layer can be reduced, and the chlorine content of the entire electrochemical cell packaging material can be reduced.
- the second configuration of the present invention is characterized in that, in the electrochemical cell packaging material of the above configuration, the fluorine-containing copolymer is a tetrafluoride-type fluorine-based polyol resin.
- the third configuration of the present invention is characterized in that, in the packaging material for an electrochemical cell having the above configuration, the fluorine-containing copolymer is mainly composed of tetrafluoroethylene.
- the fluorine-containing copolymer includes a monomer represented by the following general formulas (1) to (3), a crosslinkable functional group: And a copolymer obtained by polymerizing a monomer that can be copolymerized with the monomers represented by the general formulas (1) to (3).
- X represents a fluorine atom, a hydrogen atom or a trifluoromethyl group
- R represents an alkyl group having 1 to 8 carbon atoms
- Formula (3) in R1 is -OR2 or -CH 2 OR @ 2 (where, R2 is an alkyl group having a hydroxyl group) showing a]
- the fifth configuration of the present invention is characterized in that the chlorine content of the adhesive layer is 50 ppm or less in the packaging material for electrochemical cells.
- the entire adhesive layer including the curing agent can be reduced in chlorine.
- the chemical conversion treatment layer is formed of a chemical conversion treatment liquid containing an aminated phenol polymer, a trivalent chromium compound, a phosphorus compound, and an epoxy resin. It is characterized by having.
- the laminate strength, sealing strength, electrolytic solution resistance, water vapor barrier property, moldability, and insulation between the surface of the metal foil layer on which the chemical conversion treatment layer is formed and the low chlorine adhesive layer are stabilized. Generation of delamination between the metal foil layer and the heat-adhesive resin layer can be prevented.
- the present invention by reducing the chlorine component contained in the main material constituting the adhesive layer, it is excellent in environmental performance and has a stable laminate strength, seal strength, electrolytic solution resistance, water vapor barrier property, moldability. And the packaging material for electrochemical cells excellent in insulation can be provided.
- the present invention is a packaging material for electrochemical cells that has excellent environmental performance and exhibits stable laminate strength, seal strength, electrolytic solution resistance, water vapor barrier properties, moldability, and insulation properties.
- the description of the portions common to FIG. 2 of the conventional example is omitted.
- FIG. 1 is a cross-sectional view showing a layer structure of an electrochemical cell packaging material which is an example of an embodiment of the present invention.
- an electrochemical cell packaging material 110 according to this embodiment is drawn nylon.
- the film layer 111, the aluminum foil layer 112, the chemical conversion treatment layer 113, the fluorine resin layer 114, and the polypropylene film layer 115 are sequentially laminated.
- the packaging material 110 for electrochemical cells of the present invention includes the above-described layers and also includes a case where different layers are interposed between the layers, and includes the stretched nylon film layer 111 and the aluminum foil layer 112, for example.
- a chemical conversion treatment layer may be formed on the surface of the aluminum foil layer 112 on the stretched nylon film layer 111 side by interposing a fluorine resin layer therebetween.
- the stretched nylon film layer 111 is an example of the “base material layer” in the present invention
- the aluminum foil layer 112 is an example of the “metal foil layer” in the present invention
- the fluororesin layer 114 is the “adhesion” in the present invention.
- the polypropylene film layer 115 is an example of the “thermal adhesive resin layer” in the present invention.
- the aluminum foil layer 112 and the polypropylene film layer 115 are bonded by a dry laminating method with the fluorine resin layer 114, and the chemical conversion treatment layer 113 applied to the surface of the aluminum foil layer 112 is the fluorine resin layer 114 and the aluminum film.
- the adhesive strength with the foil layer 112 is further stabilized.
- the fluorine-based resin layer 114 is formed of a fluorine-based resin obtained by reacting a fluorine-containing copolymer as a main material and a curing agent that reacts with the fluorine-containing copolymer.
- the fluorine-containing copolymer contains a hydroxyl group, so that the fluorine-containing copolymer is soluble in an organic solvent and has a crosslinking site in the molecule.
- As the crosslinking site an alcoholic hydroxyl group (OH group), etc. There is.
- Examples of the fluoroolefin monomer include tetrafluoroethylene, trifluoroethylene, hexafluoropropylene, and the like.
- Examples of the ⁇ -methyl-substituted ⁇ -olefin monomer include isobutylene, 2-methyl-1-pentene, 2-methyl-1-hexene and the like.
- Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 2-hydroxypropyl vinyl ether, 2-hydroxy-2-methylpropyl vinyl ether, 4-hydroxybutyl vinyl ether, and 5-hydroxypentyl. Examples thereof include vinyl ether, 6-hydroxyhexyl vinyl ether, 2-hydroxyethyl allyl ether, and 4-hydroxybutyl allyl ether.
- Examples of other monomers that can be copolymerized with the fluoroolefin monomer, the ⁇ -methyl-substituted ⁇ -olefin monomer, and the hydroxyl group-containing monomer include vinyl acetate, vinyl propionate, (iso ) Carboxylic acid vinyl esters such as vinyl butyrate, vinyl caproate, vinyl laurate, vinyl stearate, vinyl benzoate, vinyl xafluoropropionate, vinyl trifluoroacetate, maleic acid or dimethyl fumarate, diethyl, dipropyl, dibutyl, Alkyl vinyl such as diester of maleic acid or fumaric acid such as ditrifluoromethyl, ditrifluoromethyl, dihexafluoropropyl, methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, iso-butyl vinyl ether, tert-butyl vinyl ether In addition to cycloalkyl vinyl ethers
- the fluorine-containing copolymer having a hydroxyl group can be obtained by copolymerizing the monomers of the above formulas 1) to 4) by a known method such as emulsion polymerization, solution polymerization or suspension polymerization.
- the fluorine-containing copolymer having a hydroxyl group has a number average molecular weight measured by GPC of 1,000 to 500,000, preferably 3,000 to 100,000.
- an organic polyisocyanate compound having high reactivity with a hydroxyl group as a crosslinking site is suitable, for example, 2,4-tolylene diisocyanate, diphenylmethane-4,4′-diisocyanate, xylylene diisocyanate.
- Isophorone diisocyanate lysine methyl ester diisocyanate, methylcyclohexyl diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene diisocyanate, n-pentane-1,4-diisocyanate, and trimers thereof, adducts and burettes thereof, or Examples of these polymers include those having two or more isocyanate groups, and blocked isocyanates.
- Fluorine resin is formed by reacting such a fluorine-containing copolymer containing a hydroxyl group with a curing agent.
- the fluorine-containing copolymer is dissolved in a solvent and 0.3 equivalents or more, preferably 0.5 to 2.0 equivalents, based on 1 equivalent of a hydroxyl group (—OH group) in the fluorine-containing copolymer. It is appropriate to add the curing agent. When it is less than 0.3 equivalent, the laminate strength cannot be obtained, and when it exceeds 2.0 equivalent, a large amount of unreacted isocyanate groups may remain and the laminate strength may be lowered.
- the chemical conversion treatment layer 113 is formed on the surface of the aluminum foil layer 112 on the fluorine resin layer 114 side. Further, the chemical conversion treatment layer 113 can firmly bond the aluminum foil layer 112 and the fluorine-based resin layer 114 to prevent delamination of the aluminum foil layer 112 and the polypropylene film layer 115.
- the aluminum foil layer 112 prevents delamination between the aluminum foil layer 112 and the polypropylene film layer 115 during embossing by forming an acid-resistant film such as phosphate, chromate, fluoride, triazine thiol compound, etc.
- the hydrogen fluoride produced by the reaction between the electrolyte and the water vapor of the lithium ion battery prevents the aluminum surface from being dissolved and corroded, especially the aluminum oxide present on the aluminum surface from being dissolved and corroded. Adhesion (wetting) can be improved.
- the chemical conversion treatment layer 113 is made of aluminum by chromium-based chemical conversion treatment such as chromate chromate treatment, phosphoric acid chromate treatment, coating-type chromate treatment, or non-chromium (coating-type) chemical conversion treatment such as zirconium, titanium, and zinc phosphate. Although it is formed on the surface of the foil layer 112, it can be firmly bonded to the fluororesin 8, and it can be continuously processed and a water washing step is unnecessary, so that the processing cost can be reduced. From the above, it is most preferable to perform a coating type chemical conversion treatment, in particular, a treatment liquid containing an aminated phenol polymer, a trivalent chromium compound, a phosphorus compound, and an epoxy resin.
- a coating type chemical conversion treatment in particular, a treatment liquid containing an aminated phenol polymer, a trivalent chromium compound, a phosphorus compound, and an epoxy resin.
- Polypropylene film layer 115 is preferably made of polypropylene, but polyolefin having thermal adhesiveness can be used.
- a linear low density polyethylene, a medium density polyethylene single layer or a multilayer, or a linear low density polyethylene, a blend resin of medium density polyethylene can be used.
- Polypropylene can be classified into random propylene, homopropylene, block propylene and the like.
- Each of the above types of polypropylene, ie, random polypropylene, homopolypropylene, and block polypropylene includes a low crystalline ethylene-butene copolymer, a low crystalline propylene-butene copolymer, and a three-component copolymer of ethylene, butene, and propylene.
- An antiblocking agent (AB agent) such as a polymer terpolymer, silica, zeolite, or acrylic resin beads, a fatty acid amide slip agent, or the like may be added.
- the above-mentioned types of polypropylene layers may be combined in a timely manner to form a multilayer.
- the aluminum foil layer 112 is a layer for preventing water vapor from entering from the outside, stabilizes the pinhole and processability (pouching, embossing formability) of the metal foil layer alone, and has pinhole resistance.
- aluminum having a thickness of 15 ⁇ m or more is used.
- the aluminum material used as the aluminum foil layer 112 is selected in order to prevent the occurrence of cracks in the embossing molding. It is desirable that the iron content be 0.3 to 9.0% by weight, preferably 0.7 to 2.0% by weight.
- aluminum produced by cold rolling changes its flexibility, waist strength and hardness under annealing (so-called annealing treatment) conditions, but the aluminum used in the present invention is harder than the non-annealed hard-treated product. Aluminum which tends to be soft with some or complete annealing is preferred.
- the stretched nylon film layer 111 can be a stretched polyester or nylon film as a base material layer.
- the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolymerized polyester, polycarbonate, and the like.
- nylon include polyamide resin, that is, nylon 6, nylon 6,6, a copolymer of nylon 6 and nylon 6,6, nylon 6,10, polymetaxylylene adipamide (MXD6), and the like.
- the base material layer can be laminated with films of different materials in addition to the polyester film or the nylon film in order to improve the pinhole resistance and the insulation when the battery is used as the battery outer body.
- liquid curable polyurethane adhesive dry after 4.0 g / m 2
- An adhesive solution added in an amount of 2.0 equivalents to 1 equivalent of the hydroxyl group (—OH group) is applied onto the chemical conversion treatment layer 1 to cover it.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and a carbodiimide resin to form a chemical conversion treatment layer 2, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- Fluorine-based fluoropolyol resin (trade name: Lumiflon LF9100 manufactured by Asahi Glass Co., Ltd.), a main material, and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.) consisting of IPDI is fluorine
- An adhesive solution containing 2.0 equivalents of 1 equivalent of hydroxyl group (—OH group) of a polyol-based polyol resin After forming the by coating over the layer 2 (3.0 g / m 2 after drying) a fluorine-based resin layer 1, and heated compressed fluorinated unstretched polypropylene film from above the resin layer 1 (thickness 50 [mu] m) Laminated (dry lamination method).
- a packaging material for an electrochemical cell according to Comparative Example 2 composed of biaxially stretched nylon film / adhesive / chemical conversion layer 2 / aluminum foil / chemical conversion layer 2 / fluorine resin layer 1 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound and a phosphorus compound to form a chemical conversion treatment layer 1, and two aluminum foils are formed on one side of the aluminum foil.
- a biaxially stretched nylon film (thickness 25 ⁇ m) is bonded to one surface via a liquid-cure polyurethane adhesive (4.0 g / m 2 after drying) by the dry laminating method.
- Fluorine-based fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.), which is the main material, and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.) made of IPDI and fluorine.
- the packaging material for an electrochemical cell according to the present invention 1 composed of biaxially stretched nylon film / adhesive / chemical conversion treatment layer 1 / aluminum foil / chemical conversion treatment layer 1 / fluorine-based resin layer 2 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and a carbodiimide resin to form a chemical conversion treatment layer 2, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- the main material is a tetrafluoride-type fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.) and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.). ) was added in an amount of 2.0 equivalents to 1 equivalent of a hydroxyl group (—OH group) of a fluorine-based polyol resin. It is applied over the treated layer 2 after the formation of the fluorine-based resin layer 2 (3.0 g / m 2 after drying), fluorine-based unstretched polypropylene film from above the resin layer 2 (thickness 50 [mu] m) were heated compressed And laminated (dry lamination method).
- a tetrafluoride-type fluoropolyol resin trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.
- a curing agent trade name: Z4470BA, manufactured by Sumika Bayer U
- the packaging material for an electrochemical cell according to the present invention 2 comprising biaxially stretched nylon film / adhesive / chemical conversion layer 2 / aluminum foil / chemical conversion layer 2 / fluorinated resin layer 2 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and an epoxy resin to form a chemical conversion treatment layer 3, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- the main material is a tetrafluoride-type fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.) and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.). ) Is added to the adhesive solution in which 1.7 equivalents is added to 1 equivalent of the hydroxyl group (—OH group) of the fluorine-based polyol resin.
- a tetrafluoride-type fluoropolyol resin trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.
- a curing agent trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.
- the packaging material for an electrochemical cell according to the present invention 3 comprising biaxially stretched nylon film / adhesive / chemical conversion treatment layer 3 / aluminum foil / chemical conversion treatment layer 3 / fluorinated resin layer 3 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and an epoxy resin to form a chemical conversion treatment layer 3, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- the main material is a tetrafluoride-type fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.) and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.). ) Is added to 2.0 equivalents of 1 equivalent of hydroxyl group (—OH group) of the fluorine-based polyol resin. After forming the (3.0 g / m 2 after drying) a fluorine-based resin layer 2 applied from the top of 3, then heated and compressed unstretched polypropylene film (thickness 50 [mu] m) from the top of the fluorine-based resin layer 2 laminated (Dry lamination method).
- a fluorine-based resin layer 2 applied from the top of 3, then heated and compressed unstretched polypropylene film (thickness 50 [mu] m) from the top of the fluorine-based resin layer 2 laminated (Dry lamination method).
- the packaging material for an electrochemical cell according to the present invention 4 comprising biaxially stretched nylon film / adhesive / chemical conversion layer 3 / aluminum foil / chemical conversion layer 3 / fluorine resin layer 2 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment solution containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and an epoxy resin to form a chemical conversion treatment layer 3, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- the main material is a tetrafluoride-type fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.) and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.). ) Is added to 2.3 equivalents of 1 equivalent of hydroxyl group (—OH group) of the fluorine-based polyol resin.
- a fluorine-based resin layer 4 is applied over the 3, (a thickness of 50 [mu] m) unstretched polypropylene film from the top of the fluorine-based resin layer 4 and the heat-compressing Laminated (dry lamination method).
- the packaging material for an electrochemical cell according to the present invention 5 comprising biaxially stretched nylon film / adhesive / chemical conversion treatment layer 3 / aluminum foil / chemical conversion treatment layer 3 / fluorinated resin layer 4 / unstretched polypropylene film Got.
- Both sides of the aluminum foil are treated with a chemical conversion treatment liquid containing an aminated phenol polymer, a chromium trioxide compound, a phosphorus compound and an epoxy resin to form a chemical conversion treatment layer 3, and one of the aluminum foils
- a biaxially stretched nylon film (thickness of 25 ⁇ m) is bonded to one surface via a two-component curable polyurethane adhesive (4.0 g / m 2 after drying) on one surface by a dry laminating method.
- the main material is a tetrafluoride-type fluoropolyol resin (trade name: Zeffle GK-550, manufactured by Daikin Industries, Ltd.) and a curing agent (trade name: Z4470BA, manufactured by Sumika Bayer Urethane Co., Ltd.). ) Is added to 2.0 equivalents of 1 equivalent of hydroxyl group (—OH group) of the fluorine-based polyol resin. After forming the (3.0 g / m 2 after drying) a fluorine-based resin layer 2 applied from the top of the 3, (thickness 80 [mu] m) unstretched polypropylene film from the top of the fluorine-based resin layer 2 by a heat compression Laminated (dry lamination method).
- a fluorine-based resin layer 2 applied from the top of the 3, (thickness 80 [mu] m) unstretched polypropylene film from the top of the fluorine-based resin layer 2 by a heat compression Laminated (dry
- the packaging material for an electrochemical cell according to the present invention 6 comprising biaxially stretched nylon film / adhesive / chemical conversion treatment layer 3 / aluminum foil / chemical conversion treatment layer 3 / fluorine-based resin layer 2 / unstretched polypropylene film.
- each of the chemical conversion treatments was applied by a roll coating method, and baked under the condition that the film temperature was 180 ° C. or higher.
- the amount of chromium applied was 10 mg / m 2 (dry weight).
- the packaging material for electrochemical cells according to the present invention 4 and Comparative Example 1 produced by the above method was quantified by the BS EN14582: 2007 method based on IEC62321 10th edition, and the values are shown in Table 1. Note that “ND” in Table 1 represents a value lower than the measurement limit value of 50 ppm.
- the packaging material for electrochemical cells according to Invention 1 to Invention 6 and Comparative Example 1 to Comparative Example 2 produced by the above method is cut into two pieces of 150 mm ⁇ 60 mm strips, and the unstretched polypropylene film side is overlapped.
- heat sealing (sealing temperature 190 ° C., surface pressure 1.0 MPa, sealing time 3.0 seconds) was performed. Then, it is cut to a width of 15 mm, and immediately after heat sealing, the sealing portion of the two strips is pulled away at a speed of 300 mm / min by a tensioner (manufactured by Shimadzu Corporation, AGS-50D (trade name)), and the strength at the time of pulling is increased.
- Table 2 shows the results of measurement of the seal strength and evaluation of each sample.
- the unit is N / 15 mm width.
- Table 2 shows the results of measurement of the seal strength and evaluation of each sample.
- the unit is N / 15 mm width.
- only the packaging material according to Comparative Example 2 has a seal strength of 100 or less ( ⁇ )
- the other samples have an initial laminate strength greater than 100 ( ⁇ )
- the sample according to Invention 6 is a seal.
- the strength was 140 or more ( ⁇ ).
- the packaging materials for electrochemical cells according to Inventions 1 to 6 and Comparative Examples 1 and 2 produced by the above method are cut into 150 mm ⁇ 60 mm strips, and the unstretched polypropylene film side is overlapped in the longitudinal direction. After folding in half and heat-sealing (seal temperature 190 ° C., surface pressure 1.0 MPa, seal time 3.0 seconds) at a distance of 3 mm away from the folded side along the folded side at 7 mm width, both sides 2 of the folded side The sides were heat sealed to form a pouch.
- An encapsulant bag was produced by heat sealing. And it preserve
- Table 2 shows the evaluation results of each sample, which were separated at a rate of minutes and the strength at the time of taking was measured as the seal strength after immersion in the electrolyte.
- the unit is N / 15 mm width.
- the sealing strength of the packaging material according to Comparative Example 1 and the present invention 1 is 35 or less (x)
- the packaging material according to the present invention 3 is 50 or less
- the other samples have the sealing strength.
- the electrochemical cell packaging materials according to Inventions 1 to 6 and Comparative Examples 1 and 2 produced by the above method are cut into 120 mm ⁇ 120 mm strips, and the unstretched polypropylene film side is overlapped and folded in two. Then, the long side opposite to the folded side was heat-sealed with a width of 7 mm (sealing conditions: sealing temperature 190 ° C., surface pressure 1.0 MPa, sealing time 3.0 seconds), and then trimmed to a width of 3 mm.
- sealing conditions seal temperature 190 ° C., surface pressure 2.0 MPa, seal time 3.0 seconds
- the amount of water contained in the electrolyte solution was measured by the Karl Fischer method, and each sample was evaluated.
- the unit is ppm.
- the moisture permeation amount of the packaging material according to Comparative Example 2 is 30 ppm or less ( ⁇ )
- the moisture permeation amount of the packaging material according to the present inventions 2, 4, and 5 is 40 ppm or less ( ⁇ ).
- the moisture permeation amount of the packaging materials according to the present inventions 3 and 6 was 45 ppm or more.
- the packaging material for electrochemical cells according to Inventions 1 to 6 and Comparative Examples 1 and 2 produced by the above method was cut to produce a strip of 120 mm ⁇ 80 mm, and a rectangular male of 55 ⁇ 32 mm.
- a straight mold male corner R: 2 mm, ridge line R: 1 mm
- the unstretched polypropylene film side is positioned on the male mold side.
- the strip is placed on the female mold and pressed with a pressing pressure (surface pressure) of 0.16 MPa, and the strip is cold-pressed to a molding depth of 5 mm.
- Table 2 shows a molded container (tray) having a rectangular recess having a rectangular shape of 32 mm and flanges at the four peripheral edges of the recess, and visually observing and evaluating the occurrence of whitening of each molded container. As shown in Table 2, generation of whitening was not confirmed in the packaging materials according to Comparative Example 3 and Inventions 3 and 4 ( ⁇ ).
- the packaging material for electrochemical cells according to Inventions 1 to 6 and Comparative Examples 1 and 2 produced by the above method was cut to produce a strip of 120 mm ⁇ 80 mm, and a rectangular male of 55 ⁇ 32 mm.
- a straight mold male corner R: 2 mm, ridge line R: 1 mm
- the strip is placed on the female mold and pressed with a pressing pressure (surface pressure) of 0.16 MPa, and the strip is cold-pressed to a molding depth of 5 mm.
- a molded container (tray) having a rectangular recess of ⁇ 32 mm and a flange at the four peripheral edges of the recess was produced.
- a voltage of 250 V was applied for 5 seconds between the electrolytic solution and the aluminum foil constituting the packaging material for electrochemical cells, the resistance value was measured, and each sample was evaluated.
- all the packaging materials according to the present inventions 2 to 6 had a resistance value of 1000 M ⁇ or more, and no short circuit occurred ( ⁇ ).
- the packaging materials for electrochemical cells according to Inventions 1 to 6 have a low chlorine content, a certain initial laminate strength, seal strength, electrolyte resistance, water vapor barrier. It was found that the material exhibited good properties, moldability, and insulation.
- Packaging material for electrochemical cells 111, 211 Stretched nylon film layer (base material layer) 112, 212 Aluminum foil layer (metal foil layer) 113, 213 Chemical conversion treatment layer 114, 214 Fluorine resin layer (adhesive layer) 115, 215 Polypropylene layer (thermal adhesive resin layer)
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Laminated Bodies (AREA)
Abstract
Description
〔一般式(1)においてXはフッ素原子、水素原子ないしトリフルオロメチル基を示す〕
〔一般式(2)においてRは炭素数1~8のアルキル基を示す〕
〔一般式(3)においてR1は-OR2又は-CH2OR2(但し、R2は水酸基を有するアルキル基)を示す〕
1)式:CF2=CFX〔式中、Xはフッ素原子、水素原子ないしトリフルオロメチル基である〕で表されるフルオロオレフィン単量体、
2)式:CH2=CR(CH2)〔式中、Rは炭素数1~8のアルキル基である〕で表されるβ-メチル置換α-オレフィン単量体、
3)式:CH2=CHR1〔式中、R1は-OR2又は-CH2OR2(但し、R2は水酸基を有するアルキル基)である〕で表される水酸基含有単量体、および、
4)架橋性官能基を有さず、かつ、前記単量体1)、2)、3)と共重合し得る他の単量体から導かれるフッ素含有共重合体を挙げることができる。
アルミニウム箔(厚さ40μm)の両面にアミノ化フェノール重合体、三化クロム化合物、リン化合物を含有する化成処理液で処理して化成処理層1を形成するとともに、アルミニウム箔の一方の面に2液硬化型ポリウレタン系接着剤(乾燥後に4.0g/m2)を介して一方の面に2軸延伸ナイロンフィルム(厚さ25μm)をドライラミネート法により貼り合わせ、アルミニウム箔のもう一方の面に主材である3フッ化型のフッ素系ポリオール樹脂(商品名:ルミフロンLF9100 旭硝子株式会社製)にIPDIヌレート体及びIPDIからなる硬化剤(商品名Z4470BA 住化バイエルウレタン社製)をフッ素系ポリオール樹脂の水酸基(-OH基)1当量に対して2.0当量添加した接着剤溶液を化成処理層1上に塗布してフッ素系樹脂層1(乾燥後に3.0g/m2)を形成した後、フッ素系樹脂層1の上から未延伸ポリプロピレンフィルム(厚さ50μm)を加熱圧縮してドライラミネーション法により貼り合わせた。これにより、2軸延伸ナイロンフィルム/接着剤/化成処理層1/アルミニウム箔/化成処理層1/フッ素系樹脂層1/未延伸ポリプロピレンフィルムで構成される比較例1に係る電気化学セル用包装材料を得た。
[ハロゲン含有量の評価]
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を裁断して15mm×75mmの短冊片を1枚ずつ作製し、貼り合わせた未延伸ポリプロピレンフィルムとアルミニウム箔とを引張り機(島津製作所製、AGS-50D(商品名))により50mm/分の速度で引き離しながら、引き取り時の強度を初期ラミネート強度として測定し、各試料を評価したものを表2に示す。なお、初期ラミネート強度の単位はN/15mm巾である。表2に示すように、比較例2に係る包装材料のみ初期ラミネート強度が5.0以下であり(×)、それ以外の試料は初期ラミネート強度が12以上であり(○)、本発明6に係る試料は初期ラミネート強度が18以上であった(◎)。
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を裁断して150mm×60mmの短冊片を2つ折りにし、未延伸ポリプロピレンフィルム側を重ね合わせてヒートシール(シール温度190℃、面圧1.0MPa、シール時間3.0秒)した。そして、15mm巾にカットし、ヒートシール直後に引張り機(島津製作所製、AGS-50D(商品名))により2枚の短冊片のシール部分を300mm/分の速度で引き離し、引き取り時の強度をシール強度として測定し、各試料を評価したものを表2に示す。なお、単位はN/15mm巾である。表2に示すように、比較例2に係る包装材料のみシール強度が100以下であり(×)、それ以外の試料は初期ラミネート強度が100より大きく(○)、本発明6に係る試料はシール強度が140以上であった(◎)。
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を150mm×60mmの短冊片に裁断し、未延伸ポリプロピレンフィルム側を長手方向に重ね合わせて2つ折りにし、折り返し辺から3mm離れた場所を7mm巾で折り返し辺に沿ってヒートシール(シール温度190℃、面圧1.0MPa、シール時間3.0秒)した後、折り返し辺の両側2辺をヒートシールしてパウチを形成した。次に、パウチ内部に電解液(エチレンカーボネート:ジエチルカーボネート:ジメチルカーボネート=1:1:1の溶液に1Mの6フッ化リン酸リチウムを添加した電解液)2gを入れ、開口する残りの一辺をヒートシールして封入体(袋)を作製した。そして、最初にシールした辺を下に向けて60℃で72時間保存した。その後、電解液を廃棄した後、最初にシールした辺が15mm巾残るようにパウチを裁断し、引張り機(島津製作所製、AGS-50D(商品名))により折り返し辺と対向する辺を300mm/分の速度で引き離し、引き取り時の強度を電解液浸漬後のシール強度として測定し、各試料を評価したものを表2に示す。なお、単位はN/15mm巾である。表2に示すように、比較例1及び本発明1に係る包装材料のシール強度が35以下であり(×)、本発明3に係る包装材料が50以下であり、それ以外の試料はシール強度が50以上であった(○)。
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を120mm×120mmの短冊片に裁断し、未延伸ポリプロピレンフィルム側を重ね合わせて2つ折りにし、折り返し辺と対向する長辺を7mm巾でヒートシール(シール条件:シール温度190℃、面圧1.0MPa、シール時間3.0秒)した後3mm巾にトリミングした。次に、折り返し辺の両側2辺の一方を10mm巾でヒートシール(シール条件:シール温度190℃、面圧2.0MPa、シール時間3.0秒)してパウチを形成し、溶液(エチレンカーボネート:ジエチルカーボネート:ジメチルカーボネート=1:1:1)を3gパウチ内部に注入した後、開口する残りの短辺を10mm巾でヒートシール(シール条件:シール温度190℃、面圧2.0MPa、シール時間3.0秒)して封入体(袋)を作製した。次に上記パウチを湿度90%、60℃の環境下で7日間保存した後、カールフィッシャー法により電解液中に含まれる水分量を測定して、各試料を評価したものを表2に示す。なお、単位はppmである。表2に示すように、比較例2に係る包装材料の水分透過量は30ppm以下であり(◎)、本発明2、4、5に係る包装材料の水分透過量は40ppm以下であり(○)、本発明3、6に係る包装材料の水分透過量は45ppm以上であった。
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を裁断して120mm×80mmの短冊片を作製し、55×32mmの矩形状の雄型とこの雄型とのクリアランスが0.3mmの雌型からなるストレート金型(雄型のコーナーR:2mm、稜線R:1mm)を用い、雄型側に未延伸ポリプロピレンフィルム側が位置するように雌型上に短冊片を載置するとともに短冊片を0.16MPaの押え圧(面圧)で押えて、上記短冊片を5mmの成形深さに冷間プレス成形し、深さが5mmで55×32mmの矩形状の凹部と、凹部の4周縁にフランジ部を有する成形容器(トレイ)を作製し、各成形容器の白化の発生の有無を目視により観察し評価したものを表2に示す。表2に示すように、比較例3、本発明3、4に係る包装材料は白化の発生が確認されなかった(○)。
上記方法により作製した本発明1~本発明6及び比較例1~比較例2にかかる電気化学セル用包装材料を裁断して120mm×80mmの短冊片を作製し、55×32mmの矩形状の雄型とこの雄型とのクリアランスが0.3mmの雌型からなるストレート金型(雄型のコーナーR:2mm、稜線R:1mm)を用い、雄型側に未延伸ポリプロピレンフィルム側が位置するように雌型上に短冊片を載置するとともに短冊片を0.16MPaの押え圧(面圧)で押えて、上記短冊片を5mmの成形深さに冷間プレス成形し、深さが5mmで55×32mmの矩形状の凹部と、凹部の4周縁にフランジ部を有する成形容器(トレイ)を作製した。次に、その成形容器内部に電解液(エチレンカーボネート:ジエチルカーボネート:ジメチルカーボネート=1:1:1の溶液に1Mの6フッ化リン酸リチウムを添加した電解液)を5g注入した。次に、電解液と電気化学セル用包装材料を構成するアルミニウム箔との間に250Vの電圧を5秒間印加し、その抵抗値を測定し、各試料を評価したものを表2に示す。表2に示すように、本発明2~6に係る包装材料はいずれも抵抗値が1000MΩ以上あり、短絡は発生しなかった(○)。
111、211 延伸ナイロンフィルム層(基材層)
112、212 アルミニウム箔層(金属箔層)
113、213 化成処理層
114、214 フッ素系樹脂層(接着剤層)
115、215 ポリプロピレン層(熱接着性樹脂層)
Claims (6)
- 基材層と、金属箔層と、前記金属箔層表面に形成される化成処理層と、接着剤層と、熱接着性樹脂層とを、少なくとも順次積層して構成される電気化学セル用包装材料であって、
前記接着剤層はフッ素含有共重合体を含む主材と、硬化剤と、で形成され、
前記フッ素含有共重合体は塩素基を含有しないことを特徴とする電気化学セル用包装材料。 - 前記フッ素含有共重合体が4フッ化型のフッ素系ポリオール樹脂であることを特徴とする請求項1に記載の電気化学セル用包装材料。
- 前記フッ素含有共重合体はテトラフルオロエチレンを主成分とすることを特徴とする請求項2に記載の電気化学セル用包装材料。
- 前記接着剤層の塩素含有量が、50ppm以下であることを特徴とする請求項1~請求項4のいずれかに記載の電気化学セル用包装材料。
- 前記化成処理層が、前記化成処理層が、アミノ化フェノール重合体、3価クロム化合物、リン化合物、および、エポキシ樹脂を含有する化成処理液により形成されていることを特徴とする請求項1~請求項5のいずれかに記載の電気化学セル用包装材用。
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JP2014112468A (ja) * | 2012-11-01 | 2014-06-19 | Showa Denko Packaging Co Ltd | 電池用外装材及び電池 |
US11552356B2 (en) | 2017-06-02 | 2023-01-10 | Sumitomo Electric Fine Polymer, Inc. | Electricity storage device member, method of manufacturing the same, and electricity storage device |
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CN103700789B (zh) * | 2013-12-31 | 2016-01-13 | 明冠新材料股份有限公司 | 聚合物锂离子电池软包装膜及其制备方法 |
CN108329868B (zh) * | 2018-01-19 | 2019-05-17 | 苏州中世惠华合成材料有限公司 | 锂电池包装膜用粘合剂组合物、锂电池包装复合膜、其制备方法及锂电池包装袋 |
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JP2007090783A (ja) * | 2005-09-30 | 2007-04-12 | Dainippon Printing Co Ltd | 積層体 |
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JP2014112468A (ja) * | 2012-11-01 | 2014-06-19 | Showa Denko Packaging Co Ltd | 電池用外装材及び電池 |
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