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
  • H01M50/183—Sealing members
  • H01M50/19—Sealing members characterised by the material
  • H01M50/193—Organic material
• • 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
• • 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 sealing agent composition used for non-aqueous electrolyte batteries, has high durability with respect to various electrolytes, and improves workability during application and drying of gaskets used for non-aqueous electrolyte batteries.
• the present invention relates to a sealing agent composition that is excellent and can provide a sealing layer that does not easily peel off from a gasket.
• Non-aqueous electrolyte batteries such as lithium ion batteries are often used for these portable electronic devices. Further, non-aqueous electrolyte batteries are attracting attention as power sources for electric vehicles and hybrid vehicles that address environmental problems in the automobile industry.
• non-aqueous electrolyte batteries are composed of an element unit in which a pair of electrodes are arranged to face each other with a separator interposed therebetween, an electrolyte, and a container for housing these.
• This container is generally composed of a metal case having an opening and a sealing body that seals the opening.
• a gasket may be interposed between the metal case and the sealing body in order to ensure electrical insulation between them.
• JP-A-63-021744 discloses that a sealant composition is applied by a dip coating method.
• the dip coating method of the sealing agent disclosed in Japanese Patent Application Laid-Open No. 63-021744 has been difficult to form a uniform film on the gasket.
• gaskets coated on the surface have the problem of sticking to each other during storage, and the sealant agglomerates when carrying the gasket coated on the surface with the parts feeder. It was.
• Japanese Patent Laid-Open No. 10-223184 discloses a method in which a large number of gaskets can be coated with a sealing agent at a time and the film thickness can be uniformly applied. There is disclosed a method for manufacturing a button-type battery that is assembled by using a gasket that is ventilated and has a sealant dried and solidified on its surface.
• an object of the present invention relates to a sealing agent composition used for a non-aqueous electrolyte battery, and provides a sealing agent composition excellent in workability at the time of applying and drying a gasket used in a non-aqueous electrolyte battery. It is. Another object of the present invention is to provide a sealant composition having high durability against various electrolytes. Furthermore, the other object of this invention is to provide the sealing compound composition which can provide the sealing layer which does not peel easily from a gasket.
• Liquid battery sealant composition [4] The sealant composition for nonaqueous electrolyte batteries according to any one of [1] to [3], which is used for coating a gasket.
• a nonaqueous electrolyte battery comprising a coating of the sealant composition for a nonaqueous electrolyte battery according to any one of [1] to [5].
• a method for producing a nonaqueous electrolyte battery comprising a step of coating a gasket with the sealant composition for a nonaqueous electrolyte battery according to any one of [1] to [5].
• the sealing agent composition for a nonaqueous electrolyte battery according to any one of [1] to [5] is placed in a state where the object to be coated is put in the drum and then the drum is rotated.
• the present invention relates to a sealant composition used for a non-aqueous electrolyte battery, and has the following constitution: an elastomer selected from the group consisting of an ethylene / propylene copolymer and an ethylene / propylene / diene copolymer.
• a non-aqueous electrolyte battery sealant composition having an ethylene content of 40 to 60% by mass and a Mooney viscosity at 125 ° C. of 10 to 55.
• the sealing agent used in the non-aqueous electrolyte battery is required to have durability against various solvents that dissolve the electrolyte.
• an elastomer selected from the group consisting of an ethylene / propylene copolymer and an ethylene / propylene / diene copolymer has high durability against various solvents.
• the present inventor has found that there is a problem of adhesion between gaskets when the sealing agent composition of a nonaqueous electrolyte battery is coated on the gasket by the drum rotation method as described above. . That is, the present inventors also found a problem that the workability at the time of applying and drying the gasket cannot be improved by simply applying the elastomer.
• the “adhesive strength between the gasket and the sealing agent” is “the adhesive strength of the sealing agent that bonds the gaskets to each other (the sealing agent itself). I thought it was more important than the cohesive strength of In the present invention, it has been found that the “cohesive strength of the sealant itself” is controlled by the molecular weight (Mooney viscosity) and crystallinity (ethylene content) of the elastomer.
• the ethylene content of the elastomer is set to 40 to 60% by mass, and the Mooney viscosity at 125 ° C. of the elastomer is set to 10 to 55.
• “And” electrolytic solution resistance "have been achieved.
• the problem that the sealing agent aggregates when the gasket is carried by the parts feeder is also improved, so that the poor application of the sealing agent to the gasket is reduced and the management items are greatly reduced. Therefore, a non-aqueous electrolyte battery with improved productivity and stable battery performance can be produced.
• the elastomer used in the present invention is at least one of an ethylene / propylene copolymer and an ethylene / propylene / diene copolymer because of its high durability against various solvents used in a non-aqueous electrolyte.
• One of these may be used alone, or two or more may be mixed and used.
• An ethylene / propylene / diene copolymer is preferably used from the standpoint of durability to various electrolytes and excellent application properties to a gasket and drying properties.
• the ethylene content of the elastomer is 40 to 60% by mass.
• the cohesive force of the sealing agent itself becomes too high, and the applicability to the gasket and the drying property are poor.
• the ethylene content of the elastomer is preferably 45 to 58% by mass, more preferably 47 to 57% by mass.
• the ethylene content of the elastomer represents the ratio of the amount of ethylene (unit) to the total amount of ethylene (unit), propylene (unit) and diene (unit) in the ethylene / propylene / diene copolymer.
• the ethylene (unit) in a polymer refers to the structural unit in the polymer of ethylene used as a monomer. The same applies to propylene and diene.
• the ethylene content and the following diene content in the polymer can be measured by infrared spectroscopy.
• At least one ethylene content is 40 to 60% by mass, and preferably the ethylene content of the elastomer having the largest content is 40 to 60% by mass, Preferably, the ethylene content of all elastomers is 40 to 60% by mass.
• the diene content of the ethylene / propylene / diene copolymer is preferably 10% by mass or less, more preferably less than 7% by mass, Especially preferably, it is less than 5 mass%. If it is out of this range, the applicability to the gasket and the drying property may be inferior.
• the lower limit of the diene content of the ethylene / propylene / diene copolymer is not particularly limited, but is preferably at least mass%.
• the diene content represents the ratio of the amount of diene to the total amount of ethylene, propylene and diene in the ethylene / propylene / diene copolymer.
• the Mooney viscosity at 125 ° C. of the elastomer is 10 to 55. When Mooney viscosity exceeds 55, the applicability to a gasket and the drying property are inferior. Moreover, when the Mooney viscosity is less than 10, the durability against various solvents used in the non-aqueous electrolyte is poor. This is because the Mooney viscosity is low, and the cohesive force of the sealing agent itself is lowered, so that the intermolecular cohesive force is lowered and the electrolytic solution easily enters the inside of the elastomer. Conceivable.
• the Mooney viscosity of the elastomer is more preferably 15 to 45, particularly preferably 20 to 40, and most preferably 25 to 40. The Mooney viscosity is measured based on ASTM D-1646.
• Examples of commercially available ethylene / propylene / diene copolymers used in the present invention include 301A, 501A (manufactured by Sumitomo Chemical), EP33, EP43 (manufactured by JSR), 2060M (manufactured by Mitsui Chemicals), 2440 (manufactured by Mitsui Chemicals). LANXESS).
• ethylene propylene copolymer 201 (made by Sumitomo Chemical Co., Ltd.) etc. are mentioned, for example.
• Solvents include aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, alicyclic hydrocarbon solvents, alcohol solvents, aldehyde solvents, ketone solvents, ester solvents, ether solvents, petroleum solvents. Can be mentioned. Among these, aromatic hydrocarbon solvents, alicyclic hydrocarbon solvents, petroleum solvents, and the like are preferable from the viewpoint of excellent compatibility with the elastomer used in the present invention.
• More specific components (A) include benzene, methylbenzene, ethylbenzene, toluene, xylene, n-hexane, cyclohexane, methylcyclohexane, ethylcyclohexane, nonane, decane, decalin, dodecane, gasoline, industrial gasoline, solvent naphtha. These may be used, and these may be used alone or in admixture of two or more.
• the boiling point of these solvents is good compatibility with the elastomer used in the present invention, and the workability is good in the drum spin coating process in which the gasket is coated with the sealant, and the gaskets do not stick to each other.
• the temperature is preferably 200 ° C, more preferably 80 to 180 ° C.
• the blending ratio of the solvent is preferably from 50 to 50,000 parts by weight, more preferably from 100 to 30,000, based on 100 parts by weight of the elastomer because the coating and drying operation for coating the gasket with the sealing agent is good. Part by mass, particularly preferably 200 to 10,000 parts by mass.
• carbon black, barium sulfate, alumina white, clay, titanium oxide and other inorganic pigments, indanthrone blue, quinacridone red, dioxazine violet, phthalocyanine blue Organic pigments such as ZnS: Ag, ZnS: Cu, ZnS: Mn, SrAl 2 O 4 : Eu, Sr 4 Al 14 O 25 : Eu, Y 2 O 2 S: Eu, Y 2 O 3 : Eu fluorescence Inorganic pigments, fluorescent organic pigments, dyes, crosslinking agents, fumed silica, calcined silica, precipitated silica, ground silica, fused silica, quartz powder, fillers such as calcium carbonate, rust preventives, silane coupling agents, terpene resins Tackifiers such as aliphatic petroleum resins and alicyclic petroleum resins, plasticizers, phenol or thiol compounds, etc.
• Antioxidant, ultraviolet absorber, light stabilizer such as hindered
• a preferred embodiment of the present invention is a non-aqueous electrolyte battery including a coating of the above sealing agent composition.
• Non-aqueous electrolyte battery in which the sealing agent composition of the present invention is used is composed of an element unit in which a pair of electrodes are arranged to face each other with a separator interposed therebetween, a non-aqueous electrolyte, and a container for housing these. Yes.
• This container is comprised from the metal case which has an opening part, and the sealing body which seals the opening part.
• a gasket may be interposed between the metal case and the sealing body.
• the non-aqueous electrolyte battery include a lithium battery and a lithium ion secondary battery, and examples of the shape include a cylindrical shape, a coin shape, and a sheet shape, but are not limited thereto.
• non-aqueous electrolyte solvent examples include ⁇ -butyrolactone, propylene carbonate, dimethoxyethane, ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, diethyl carbonate, dimethyl sulfoxide, acetonitrile, tetrahydrofuran, and the like. is not. Moreover, these can be used individually or in mixture of 2 or more types.
• examples of the gasket used for the non-aqueous electrolyte battery include polybutylene terephthalate resin, polyamide resin, polyether ether ketone resin, polyphenylene sulfide resin, EPDM, polyethylene, and polypropylene, but are not limited thereto.
• a preferred embodiment of the present invention is a method for producing a non-aqueous electrolyte battery, including a step of coating a gasket with the above-mentioned sealing agent composition.
• the gasket is mainly composed of a resin as described above, since the adhesion between gaskets is reduced by using the sealant composition of the present invention, the effect of the present invention is remarkably obtained.
• the drum spin coating method is a method in which a gasket is placed in a drum, and a sealant is sprayed or sprayed with a spray or the like while the drum is rotated. This is a system in which a sealing agent is applied to the entire gasket and dried while rotating to form a sealing agent on the gasket.
• a preferred embodiment of the present invention is a form in which the sealing agent composition is used in the drum rotation method.
• the non-aqueous electrolyte battery sealant composition is applied to the coating object in a state where the coating object is put in the drum and then the drum is rotated. It is the manufacturing method of a nonaqueous electrolyte battery including the process of coat
• the coating amount of the sealing agent composition is appropriately set in consideration of the shape and size of the gasket.
• the drying temperature is not particularly limited, but is preferably about 40 to 250 ° C.
• the drying time is not particularly limited, but is preferably about 0.1 to 48 hours.
• the sealing agent compositions of Examples 1 to 7 were excellent in gasket applicability and drying property, and excellent in durability against non-aqueous electrolyte solvents.
• the sealant compositions of Comparative Examples 1 to 5 using an elastomer whose ethylene content and / or the Mooney viscosity of the elastomer are not good were inferior in gasket applicability and drying property.
• the sealing agent compositions of Comparative Examples 6 to 9 using an ethylene / propylene copolymer and an elastomer other than the ethylene / propylene / diene copolymer are inferior in gasket applicability and drying property, and in resistance to electrolyte. Was also inferior.
• the present invention relates to a sealing agent composition used for a non-aqueous electrolyte battery, has durability against various electrolytes, has excellent workability when applying and drying a gasket, and does not easily peel off from a gasket. Since a sealing layer can be provided, and the problem of agglomeration when the gasket is carried by the parts feeder is also improved, the application of the sealant to the gasket can be reduced, and management items can be greatly reduced. And a non-aqueous electrolyte battery with stable battery performance can be manufactured.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Sealing Battery Cases Or Jackets (AREA)

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Publications (1)

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Citations (6)

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• 2013
  • 2013-05-15 WO PCT/JP2013/063590 patent/WO2013176024A1/fr not_active Ceased
  • 2013-05-15 JP JP2014516771A patent/JP6327148B2/ja active Active

Patent Citations (6)

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