# US 10,873,086 B2 · Binder for nonaqueous electrolyte secondary battery electrodes, electrode mixture for nonaqueous electrolyte secondary batteries, electrode for nonaqueous electrolyte secondary batteries, nonaqueous electrolyte secondary battery and electrical device

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- Number: US 10,873,086 B2
- Document ID: US10873086B2
- Status: Granted
- Kind: B2
- Application number: 16/086,347
- Filed: 2017-01-13
- Published: 2019-03-28
- Granted: 2020-12-22
- Earliest claimed: 2016-03-30
- Assignees: Sumitomo Seika Chemicals Co., Ltd.
- Applicants: Sumitomo Seika Chemicals Co., Ltd.
- Inventors: Erina Takahashi; Shun Hashimoto; Junichi Fujishige
- Web page: https://patentgrep.com/patent/US10873086B2

## CPC

- H01M 4/622: {being polymers}
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08L 71/02: Polyalkylene oxides
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/139: Processes of manufacture
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- C08L 2203/20: use in electrical or conductive gadgets
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

This binder for nonaqueous electrolyte secondary battery electrodes contains: a copolymer of vinyl alcohol and an ethylenically unsaturated carboxylic acid alkali metal neutralized product; and a polyalkylene oxide.

## Claims

### Claim 1

A binder for a nonaqueous electrolyte secondary battery electrode, the binder comprising:
a copolymer of vinyl alcohol and an alkali metal-neutralized product of ethylene-unsaturated carboxylic acid; and
polyalkylene oxide,
wherein a mass ratio of the copolymer to the polyalkylene oxide is 95/5 to 30/70, and the polyalkylene oxide has a viscosity average molecular weight of 50,000 to 5,000,000.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

The binder 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.

### Claim 4 (depends on 1)

The binder of claim 1, wherein the polyalkylene oxide is at least one oxide selected from the group consisting of polyethylene oxide and polypropylene oxide.

### Claim 5 (depends on 1)

The binder of claim 1, wherein the polyalkylene oxide has a viscosity average molecular weight of 150,000 to 3,800,000.

### Claim 6 (depends on 1)

The binder of claim 1, wherein the polyalkylene oxide is polyethylene oxide.

### Claim 7 (depends on 6)

The binder of claim 6, wherein the polyethylene oxide has a viscosity average molecular weight of 150,000 to 3,800,000.

### Claim 8 (depends on 1)

An electrode mixture for a nonaqueous electrolyte secondary battery, the electrode mixture comprising:
an electrode active material;
a conductive agent; and
the binder of claim 1.

### Claim 9 (depends on 8)

The electrode mixture of claim 8, wherein a content of the binder is 0.5% by mass to 40% by mass with respect to 100% by mass of a total amount of the electrode active material, the conductive agent, and the binder.

### Claim 10 (depends on 8)

An electrode for a nonaqueous electrolyte secondary battery, the electrode being prepared using the electrode mixture of claim 8.

### Claim 11 (depends on 10)

A nonaqueous electrolyte secondary battery comprising the electrode of claim 10.

### Claim 12 (depends on 11)

An electric device comprising the nonaqueous electrolyte secondary battery of claim 11.

### Claim 13

A binder for a nonaqueous electrolyte secondary battery electrode, the binder comprising:
a copolymer of vinyl alcohol and an alkali metal-neutralized product of ethylene- unsaturated carboxylic acid; and
polyethylene oxide,
wherein:
the polyethylene oxide has a viscosity average molecular weight of 150,000 to 3,800,000; and
either:
a mass ratio of the copolymer to the polyethylene oxide is 95/5 to 30/70, or
a molar ratio of the vinyl alcohol to the alkali metal-neutralized product of ethylene-unsaturated carboxylic acid is 95/5 to 5/95.

### Claim 14 (depends on 13)

The binder of claim 13, 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.

### Claim 15 (depends on 13)

An electrode mixture for a nonaqueous electrolyte secondary battery, the electrode mixture comprising:
an electrode active material;
a conductive agent; and
the binder of claim 13.

### Claim 16 (depends on 15)

The electrode mixture of claim 15, wherein a content of the binder is 0.5% by mass to 40% by mass with respect to 100% by mass of a total amount of the electrode active material, the conductive agent, and the binder.