# US 10,312,521 B2 · Binder for non-aqueous secondary battery, composition for non-aqueous secondary battery functional layer, functional layer for non-aqueous secondary battery, and non-aqueous secondary battery

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- Number: US 10,312,521 B2
- Document ID: US10312521B2
- Status: Granted
- Kind: B2
- Application number: 15/526,089
- Filed: 2015-11-24
- Published: 2017-10-26
- Granted: 2019-06-04
- Earliest claimed: 2014-11-25
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Yujiro Toyoda; Takuya Kaneda; Kentaro Hayasaka
- Web page: https://patentgrep.com/patent/US10312521B2

## CPC

- H01M 4/622: {being polymers}
- H01M 4/0402: {Methods of deposition of the material}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 50/417: Polyolefins
- H01M 50/443: Particulate material
- H01M 2300/0017: Non-aqueous electrolytes
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a binder for a non-aqueous secondary battery that has excellent preservation stability and binding capacity, and that can suppress viscosity elevation of a slurry composition. The binder for a non-aqueous secondary battery contains a particulate polymer and water. The particulate polymer has a degree of swelling in an aqueous medium at pH 5 of less than a factor of 2 and has a degree of swelling in an aqueous medium at pH 8 of at least a factor of 2 and no greater than a factor of 7.

## Claims

### Claim 1

A binder for a non-aqueous secondary battery, comprising
a particulate polymer and water, wherein
the particulate polymer has a degree of swelling in an aqueous medium at pH 5 of less than a factor of 2,
the particulate polymer has a degree of swelling in an aqueous medium at pH 8 of at least a factor of 2 and no greater than a factor of 7, and
the particulate polymer includes at least 17 mass % of an acid group-containing monomer unit.

### Claim 2 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the particulate polymer includes at least 17 mass % and no greater than 30 mass % of the acid group-containing monomer unit.

### Claim 3 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the particulate polymer includes either or both an aliphatic conjugated diene monomer unit and an aromatic vinyl monomer unit, and
a percentage content of the aliphatic conjugated diene monomer unit and a percentage content of the aromatic vinyl monomer unit are, in total, at least 10 mass % and no greater than 80 mass %.

### Claim 4 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the particulate polymer includes at least 10 mass % and no greater than 60 mass % of an aliphatic conjugated diene monomer unit.

### Claim 5 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the particulate polymer includes at least 10 mass % and no greater than 60 mass % of an aromatic vinyl monomer unit.

### Claim 6 (depends on 1)

A composition for a non-aqueous secondary battery functional layer, comprising:
the binder for a non-aqueous secondary battery of claim 1; and non-conductive particles, wherein
the composition for a non-aqueous secondary battery functional layer has a pH of higher than 7.

### Claim 7 (depends on 6)

A functional layer for a non-aqueous secondary battery formed using the composition for a non-aqueous secondary battery functional layer of claim 6.

### Claim 8 (depends on 7)

A non-aqueous secondary battery comprising the functional layer for a non-aqueous secondary battery of claim 7.

### Claim 9 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the particulate polymer includes at least 20 mass % of the acid group-containing monomer unit.

### Claim 10 (depends on 1)

The binder for a non-aqueous secondary battery of claim 1, wherein
the acid group-containing monomer unit is a structural unit derived from a carboxylic acid group-containing monomer.