# US 10,483,525 B2 · Non-aqueous electrolyte secondary battery

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- Number: US 10,483,525 B2
- Document ID: US10483525B2
- Status: Granted
- Kind: B2
- Application number: 15/558,307
- Filed: 2016-03-09
- Published: 2018-03-01
- Granted: 2019-11-19
- Earliest claimed: 2015-03-24
- Assignees: Sanyo Electric Co., Ltd.
- Applicants: Sanyo Electric Co., Ltd.
- Inventors: Shinji Kasamatsu; Na Wang
- Web page: https://patentgrep.com/patent/US10483525B2

## CPC

- H01M 4/134: Electrodes based on metals, Si or alloys
- C08F 220/56: Acrylamide; Methacrylamide
- C08K 3/04: Carbon
- C08K 3/36: Silica
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/602: {Polymers}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/621: {Binders}
- H01M 4/622: {being polymers}
- C08K 2201/001: Conductive additives
- H01M 10/052: Li-accumulators
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A non-aqueous electrolyte secondary battery having a long cycle life and generates a small amount of gas during, for example, storage in a charged state. A negative electrode in a non-aqueous electrolyte secondary battery according to an exemplary embodiment includes a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer contains a water-soluble polymer and a negative electrode active material containing a silicon-based active material. The water-soluble polymer contains 0.30 mol/100 g or more and 0.40 mol/100 g or less of an acrylic acid monomer unit and 10−4 mol/100 g or more and 10−3 mol/100 g or less of a tetrafunctional (meth)acrylate monomer unit. An aqueous solution containing 1% by mass of the polymer in terms of solid content has a viscosity of 0.05 Pa·s or higher and 0.70 Pa·s or lower.

## Claims

### Claim 1

A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein
the negative electrode includes a negative electrode current collector and a negative electrode mixture layer formed on the current collector,
the negative electrode mixture layer contains a water-soluble polymer and a negative electrode active material containing a silicon-based active material,
the water-soluble polymer includes 70% by mass or more of acrylamide, 0.30 mol/100 g or more and 0.40 mol/100 g or less of an acrylic acid monomer unit and 10−4 mol/100 g or more and 10−3 mol/100 g or less of a tetrafunctional (meth)acrylate monomer unit, and an aqueous solution containing 1% by mass of the polymer in terms of solid content has a viscosity of 0.05 Pa·s or higher and 0.70 Pa·s or lower.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the negative electrode active material further contains a carbon-based active material.

### Claim 3 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein a mass ratio of the carbon-based active material to the silicon-based active material is from 95:5 to 70:30.

### Claim 4 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the water-soluble polymer includes 2.0×10−4 mol/100 g or more and 9.0×10−4 mol/100 g or less of the tetrafunctional (meth)acrylate monomer unit.

### Claim 5 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the water-soluble polymer includes 0.32 mol/100 g or more and 0.35 mol/100 g or less of the acrylic acid monomer unit.

### Claim 6 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein the aqueous solution containing 1% by mass of the water-soluble polymer in terms of solid content has a viscosity of 0.10 Pa·s or higher and 0.65 Pa·s or lower.

### Claim 7 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein an amount of the water-soluble polymer is 1% to 7% by mass relative to a mass of the negative electrode active material.