Vinylidene fluoride copolymer, method for producing the same, gel electrolyte, and non-aqueous battery

Patent metadata

Field	Value
Publication number	US-10227429-B2
Application number	US-201515124686-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Mar 11, 2014
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

The vinylidene fluoride copolymer of the present invention is a polymer obtained by copolymerizing at least one type of fluorine-based monomer selected from hexafluoropropylene and chlorotrifluoroethylene, vinylidene fluoride, and a compound represented by formula (1) (wherein X is an atomic group having a hydroxyl group or a carboxyl group and having a molecular weight of not greater than 517 with a main chain having from 1 to 19 atoms) and is obtained by adding the compound represented by formula (1) to the fluorine-based monomer and vinylidene fluoride in divided portions or continuously during copolymerization. The gel electrolyte of the present invention contains the vinylidene fluoride copolymer and a non-aqueous electrolyte solution, and the gel electrolyte has an excellent balance of ionic conductivity and gel strength.

First claim

The invention claimed is:

1. A gel electrolyte, containing a vinylidene fluoride copolymer and a non-aqueous electrolyte solution, wherein the vinylidene fluoride copolymer is obtained by copolymerizing at least one type of fluorine-based monomer selected from hexafluoropropylene and chlorotrifluoroethylene, vinylidene fluoride, and a compound represented by chemical formula (1),

wherein in chemical formula (1), R1, R2, and R3 are each independently a hydrogen atom, a chlorine atom, or an alkyl group having from 1 to 5 carbons; and X is a hydroxyl group or an atomic group having a carboxyl group and having a molecular weight of not greater than 517 with a main chain having from 1 to 19 atoms; and
wherein the gel electrolyte has an ionic conductivity of at least 4.86×10 − 3 Scm −1 and a compressive elasticity modulus of 8.57×10 4 Nm −2 or greater.

2. The gel electrolyte according to claim 1 containing the non-aqueous electrolyte solution in an amount of from 90 to 99 wt. % per 100 wt. % of the gel electrolyte.

3. A non-aqueous battery having the gel electrolyte according to claim 1 .

4. A production method for a forming a gel electrolyte, comprising copolymerizing at least one type of fluorine-based monomer selected from hexafluoropropylene and chlorotrifluoroethylene, vinylidene fluoride, and a compound represented by chemical formula (1) to form a vinylidene fluoride copolymer comprising, wherein the compound represented by formula (1) is added to the fluorine-based monomer and vinylidene fluoride in divided portions or continuously during copolymerization;

wherein, in chemical formula (1), R 1 , R 2 , and R 3 are each independently a hydrogen atom, a chlorine atom, or an alkyl group having from 1 to 5 carbons; and X is a hydroxyl group or an atomic group having a carboxyl group and having a molecular weight of not greater than 517 with a main chain having from 1 to 19 atoms; and
wherein the gel electrolyte contains the vinylidene fluoride copolymer and a non-aqueous electrolyte solution and has an ionic conductivity of at least 4.86×10 −3 Scm −1 and a compressive elasticity modulus of 8.57×10 4 Nm −2 or greater.

5. The gel electrolyte according to claim 1 , wherein the compound represented by formula (1) is a compound represented by chemical formula (2),

wherein, in formula (2), R1, R2, and R3 are the same as in chemical formula (1); and X′ is an atomic group having a molecular weight of not greater than 472 with a main chain having 6 from 1 to 19 atoms.

6. The gel electrolyte according to claim 5 , wherein the compound represented by chemical formula (2) is a compound represented by chemical formula (3),

wherein, in chemical formula (3), R1, R2, and R3 are the same as in chemical formula (1); and X″ is an atomic group having a molecular weight of not greater than 456 with a main chain having from 1 to 18 atoms.

Assignees

• Kureha Corp

Inventors

• Watanabe Keisuke
• Kamata Shintarou

Classifications

• C08F220/283

  and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate · CPC title

• H01M6/22

  Immobilising of electrolyte · CPC title

• C08F214/22 Primary

  Vinylidene fluoride · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title