Kureha Corporation

Tamito Igarashi

Hiroshi Sato

Yasuhiro Suzuki

Takuya Ikeda

Yuki Sakai

Keisuke Watanabe

Kazuyuki Suzuki

Hiroshi Sakabe

Aisaku Nagai

Shota Kobayashi

Yusaku Inaba

Yoshiyuki Nagasawa

Mitsuyasu Sakuma

Kenta Aoki

Emi Sugawara

Shintarou Kamata

Aya Takeuchi

Kayoko Okada

Shintarou Mutou

Nobuo Ahiko

Kuniyuki Saito

Naoko Tohmiya

Tomoyuki Hidaka

Mayumi Sugahara

Yuuki Sakai

Masataka Katono

Yasufumi Ikeyama

The present invention provides a binder composition which suppresses a swelling ratio in an electrolyte solution while having sufficient peel strength. The binder composition according to the present invention contains a copolymer including monomer units derived from vinylidene fluoride, a fluorine-containing alkyl vinyl compound, and a crosslinkable monomer; the content of the monomer unit derived from the fluorine-containing alkyl vinyl compound in the copolymer being not less than 2 mass % and less than 10 mass %; and the content of the monomer unit derived from the crosslinkable monomer being less than 5 mass %.

Binder composition, binder dispersion liquid, electrode mixture, electrode, non-aqueous electrolyte secondary battery, and method for producing binder composition

An object of the present invention is to provide a structure for a non-aqueous electrolyte secondary battery that can be manufactured without going through a complicated process such as passing through a poor solvent. The structure for a non-aqueous electrolyte secondary battery of the present invention comprises a positive electrode, a separator, and a negative electrode, the structure comprising an intermediate layer formed between the positive electrode and the separator and/or between the negative electrode and the separator and including vinylidene fluoride polymer particles constituting 60 to 100 parts by mass per 100 parts by mass of raw materials that constitute the intermediate layer.

Structure for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for manufacturing same structure

An object of the present invention is to provide a filler-containing resin film in which shedding of inorganic materials or the like is suppressed, a resin composition that can be used in production of the filler-containing resin film, and a method for producing the filler-containing resin film. The filler-containing resin film of the present invention is a filler-containing resin film comprising: a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) (in formula (1), R, R, and Rare each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X' is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms); and an insulating inorganic filler. The resin film is produced by applying onto a substrate and then drying a resin composition containing the vinylidene fluoride copolymer, the insulating inorganic filler, and an organic solvent. 

Resin composition, filler-containing resin film for non-aqueous electrolyte secondary battery, and method for producing filler-containing resin film for non-aqueous electrolyte secondary battery

Provided are vinylidene fluoride copolymers exhibiting higher adhesion with respect to metal foils than do conventional vinylidene fluoride copolymers, and to provide uses of the vinylidene fluoride copolymers. The vinylidene fluoride copolymers are obtained by copolymerizing vinylidene fluoride with a compound represented by Formula (A). In Formula (A), R, Rand Rare each independently a hydrogen atom, a chlorine atom or an alkyl group; and X is an atomic group with a molecular weight of not more than 500 containing a heteroatom and having a main chain composed of 1 to 20 atoms, or is a heteroatom.

Vinylidene fluoride copolymers and uses of the copolymers

An object of the present invention is to provide a method for producing a resin film for a non-aqueous electrolyte secondary battery that does not inhibit the movement of ions such as lithium ions and that is arranged between a separator and a positive or negative electrode; and a resin film for a non-aqueous electrolyte secondary battery obtained by the production method. The method for producing a resin film for a non-aqueous electrolyte secondary battery comprises the steps of: coating a separator with a resin composition containing a solvent and a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) below (coating step); and drying the separator on which the resin composition has been coated (drying step). In formula (1), R, R, and Rare each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X' is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms. 

Method for producing resin film for non-aqueous electrolyte secondary battery and resin film for non-aqueous electrolyte secondary battery

Provided is a vinylidene fluoride polymer powder exhibiting excellent solubility in aprotic polar solvents, and a vinylidene fluoride polymer solution obtained from the powder and an aprotic polar solvent. The vinylidene fluoride polymer powder has an NMP penetration rate of 12 to 100% as measured by an NMP penetration test.

Vinylidene fluoride polymer powder and vinylidene fluoride polymer solution

A positive electrode mixture for nonaqueous batteries, is formed by adding 0.5 to 10 wt. parts of an organic acid per 100 wt. parts of an electroconductive additive, to a mixture of a composite metal oxide as a positive electrode active substance, a higher order-structured carbon black as the electroconductive additive, a binder of a fluorine-containing copolymer of at least three comonomers including vinylidene fluoride, tetrafluoroethylene and a flexibility-improving fluorine-containing monomer, and an organic solvent. Further, the mixture is applied on at least one side of an electroconductive sheet, and then dried and compressed to form a positive electrode mixture layer. As a result, it is possible to provide a positive electrode structure having a thick and sound positive electrode mixture layer of a high energy density.

Positive electrode mixture for nonaqueous battery and positive electrode structure

A core/shell polymer (A), comprising: a rubbery core comprising a crosslinked vinylidene fluoride copolymer (a) having a vinylidene fluoride content of 30-90 wt. % and a shell comprising a vinylidene fluoride polymer (b) having a vinylidene fluoride content which is larger than in the crosslinked vinylidene fluoride copolymer (a) and at least 80 wt. %, in a weight ratio (a)/(b) of 30/70-90/10. The vinylidene fluoride-based core/shell polymer (A) is excellent in mechanical properties including flexibility and resistance to nonaqueous electrolytic solutions, is capable of forming a composite electrode layer showing excellent flexibility and adhesion to an electroconductive substrate in combination with a powder active substance and is therefore suitable for use as a binder for nonaqueous electrochemical devices.

Vinylidene fluoride based core-shell type polymer and use thereof in nonaqueous electrochemical device

Growing community of inventors

Tokyo, Japan

Tamito Igarashi