Vinylidene fluoride copolymers and uses of the copolymers

Patent metadata

Field	Value
Publication number	US-9512255-B2
Application number	US-201113994982-A
Country	US
Kind code	B2
Filing date	Dec 22, 2011
Priority date	Dec 28, 2010
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

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 1 , R 2 and R 3 are 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.

First claim

The invention claimed is:

1. A vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride with a compound represented by Formula (3) below:

in Formula (3), R 1 , R 2 and R 3 are each independently a hydrogen atom, a chlorine atom or an alkyl group having 1 to 5 carbon atoms; and X′″ is an organic group with a molecular weight of not more than 456 having a main chain composed of 1 to 18 atoms.

2. The vinylidene fluoride copolymer according to claim 1 , wherein the copolymer contains 0.01 to 10 mol % of structural units derived from the compound represented by Formula (3), relative to the total of structural units derived from vinylidene fluoride and structural units derived from the compound represented by Formula (3) taken as 100 mol %.

3. The vinylidene fluoride copolymer according to claim 1 , which has an inherent viscosity of 0.5 to 5.0 dl/g.

4. The vinylidene fluoride copolymer according to claim 1 , wherein the randomness of the structural units derived from the compound represented by Formula (3) is not less than 40%.

5. An electrode mixture for nonaqueous electrolyte secondary batteries comprising the vinylidene fluoride copolymer described in claim 1 , an electrode active material and a nonaqueous solvent.

6. A positive electrode mixture for nonaqueous electrolyte secondary batteries comprising the vinylidene fluoride copolymer described in claim 1 , a lithium-based positive electrode active material and a nonaqueous solvent.

7. An electrode for nonaqueous electrolyte secondary batteries obtained by applying the electrode mixture for nonaqueous electrolyte secondary batteries described in claim 5 to a collector, and drying the coating.

8. A positive electrode for nonaqueous electrolyte secondary batteries obtained by applying the positive electrode mixture for nonaqueous electrolyte secondary batteries described in claim 6 to a collector, and drying the coating.

9. A nonaqueous electrolyte secondary battery having the electrode for nonaqueous electrolyte secondary batteries described in claim 7 .

10. A nonaqueous electrolyte secondary battery having the positive electrode for nonaqueous electrolyte secondary batteries described in claim 8 .

Assignees

• Watanabe Keisuke
• Sakai Yuuki
• Sugawara Emi
• Mutou Shintarou
• Igarashi Tamito
• Kureha Corp

Inventors

• Watanabe Keisuke
• Sakai Yuuki
• Sugawara Emi
• Mutou Shintarou
• Igarashi Tamito

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M4/623

  fluorinated polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• C08F214/225 Primary

  with non-fluorinated comonomers · CPC title