Negative-electrode mixture for non-aqueous electrolyte secondary cell, negative electrode for non-aqueous electrolyte secondary cell containing said mixture, non-aqueous electrolyte secondary cell provided with said negative electrode, and electrical device

Patent metadata

Field	Value
Publication number	US-2016156024-A1
Application number	US-201414901331-A
Country	US
Kind code	A1
Filing date	Mar 19, 2014
Priority date	Jun 28, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

A negative electrode mixture for a nonaqueous electrolyte secondary cell according to the present invention includes: a negative electrode active material; a conductive assistant; and a binder. The binder contains a copolymer of vinyl alcohol and an alkali metal-neutralized product of ethylene-unsaturated carboxylic acid.

First claim

1 . A negative electrode mixture for a nonaqueous electrolyte secondary cell, comprising:
a negative electrode active material; a conductive assistant; and a binder containing a copolymer of vinyl alcohol and an alkali metal-neutralized product of ethylene-unsaturated carboxylic acid.

2 . The negative electrode mixture of claim 1 , wherein
a content of the copolymer of the vinyl alcohol and the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid in the binder is greater than or equal to 20% by mass and less than or equal to 100% by mass.

3 . The negative electrode mixture of claim 2 , wherein
the content of the copolymer of the vinyl alcohol and the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid in the binder is greater than or equal to 30% by mass and less than or equal to 100% by mass.

4 . The negative electrode mixture of claim 1 , wherein
a content of the binder relative to the total mass of the negative electrode active material, the conductive assistant, and the binder is greater than or equal to 0.5% by mass and less than or equal to 40% by mass.

5 . The negative electrode mixture of claim 1 , wherein
a copolymer composition ratio of the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid to the vinyl alcohol in the copolymer is 95/5-5/95 in terms of a molar ratio.

6 . The negative electrode mixture of claim 1 , wherein
the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid is an alkali metal-neutralized product of acrylic acid or an alkali metal-neutralized product of methacrylic acid.

7 . The negative electrode mixture of claim 1 , wherein
the negative electrode active material contains at least one selected from the group consisting of silicon, a silicon compound, and a carbon material.

8 . The negative electrode mixture of claim 7 , wherein
the negative electrode active material is a complex of the carbon material and the silicon or the silicon compound.

9 . The negative electrode mixture of claim 8 , wherein
a ratio of the carbon material to the silicon or the silicon compound in the complex of the carbon material and the silicon or the silicon compound is 5/95-95/5 in terms of a mass ratio.

10 . The negative electrode mixture of claim 7 , wherein
the carbon material is amorphous carbon.

11 . The negative electrode mixture of claim 10 , wherein
the amorphous carbon contains soft carbon or hard carbon.

12 . The negative electrode mixture of claim 1 , wherein
the conductive assistant contains a carbon nanofiber or a carbon nanotube.

13 . The negative electrode mixture of claim 12 , wherein
a content of the carbon nanofiber or the carbon nanotube in the conductive assistant is greater than or equal to 5% by mass and less than or equal to 100% by mass.

14 . A negative electrode for a nonaqueous electrolyte secondary cell, fabricated using the negative electrode mixture of claim 1 .

15 . A nonaqueous electrolyte secondary cell, comprising:
the negative electrode of claim 14 .

16 . An electrical device, comprising:
the nonaqueous electrolyte secondary cell of claim 15 .

17 . The negative electrode mixture of claim 2 , wherein
a content of the binder relative to the total mass of the negative electrode active material, the conductive assistant, and the binder is greater than or equal to 0.5% by mass and less than or equal to 40% by mass.

18 . The negative electrode mixture of claim 3 , wherein
a content of the binder relative to the total mass of the negative electrode active material, the conductive assistant, and the binder is greater than or equal to 0.5% by mass and less than or equal to 40% by mass.

19 . The negative electrode mixture of claim 2 , wherein
a copolymer composition ratio of the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid to the vinyl alcohol in the copolymer is 95/5-5/95 in terms of a molar ratio.

20 . The negative electrode mixture of claim 3 , wherein
a copolymer composition ratio of the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid to the vinyl alcohol in the copolymer is 95/5-5/95 in terms of a molar ratio.

Assignees

• Sumitomo Seika Chemicals
• Nat Inst Of Advanced Ind Scien

Inventors

• Kinpara Yuji
• Fujishige Junichi
• Fujimoto Nobutaka
• Mukai Takashi
• Morishita Masanori
• Sakai Tetsuo

Classifications

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/622

  being polymers · CPC title