# US 10,312,520 B2 · Non-aqueous electrolyte secondary battery

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- Number: US 10,312,520 B2
- Document ID: US10312520B2
- Status: Granted
- Kind: B2
- Application number: 15/079,994
- Filed: 2016-03-24
- Published: 2016-10-06
- Granted: 2019-06-04
- Earliest claimed: 2015-04-06
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Koji Kinoshita; Tatsuya Hashimoto
- Web page: https://patentgrep.com/patent/US10312520B2

## CPC

- H01M 4/621: {Binders}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/624: {Electric conductive fillers}
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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

According to the invention, a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte is provided. The negative electrode contains a negative electrode active material, a conductive material, and a binder. When an average particle size of the conductive material is referred to as De, and an average particle size of the binder is referred to as Db, Db≤De is satisfied. In other words, the average particle size Db of the binder is equal to or smaller than the average particle size De of the conductive material.

## 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 contains a negative electrode active material, a conductive material, and a binder,
the binder is at least one of a polymer or a copolymer;
0.5≤(Db/De)≤0.9 is satisfied where an average particle size of the conductive material is De, and an average particle size of the binder is Db,
Db is 90 nm or smaller,
the average particle size of the conductive material is 180 nm or smaller, and
the average particle size is a volume-based particle size measured based on a dynamic light scattering method.

### Claim 2 (depends on 1)

The non-aqueous electrolyte secondary battery according to claim 1, wherein
the negative electrode includes a negative electrode current collector and a negative electrode active material layer,
the negative electrode active material layer contains the negative electrode active material, the conductive material, and the binder, and
a peel strength between the negative electrode current collector and the negative electrode active material layer is 4 N/m or higher.

### Claim 3 (depends on 2)

The non-aqueous electrolyte secondary battery according to claim 2, wherein a mass ratio between the conductive material and the binder is 4:1 to 6:1.