# US 2020/0287201 A1 · Negative electrode of nonaqueous lithium-ion secondary battery and nonaqueous lithium-ion secondary battery using same

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- Number: US 2020/0287201 A1
- Document ID: US20200287201A1
- Status: Published application
- Kind: A1
- Application number: 16/796,382
- Filed: 2020-02-20
- Published: 2020-09-10
- Earliest claimed: 2019-03-04
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Shinsuke MATSUHARA; Hiroto ASANO
- Web page: https://patentgrep.com/patent/US20200287201A1

## CPC

- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/366: {as layered products}
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0568: characterised by the solutes
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0034: Fluorinated solvents
- H01M 2300/004: Three solvents
- 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

A negative electrode which includes graphite particles and which is capable of imparting superior input resistance characteristics to a nonaqueous lithium-ion secondary battery is provided. The negative electrode of a nonaqueous lithium-ion secondary battery disclosed herein includes graphite particles as negative electrode active materials and a supported material being supported by the graphite particles. The graphite particles have phenolic hydroxy groups. The supported material has surface hydroxy groups. A ratio of an amount B (mmol/g) of the surface hydroxy groups in the supported material to an amount A (mmol/g) of the phenolic hydroxy groups in the graphite particles is 30 or more and 150 or less.

## Claims

### Claim 1

A negative electrode of a nonaqueous lithium-ion secondary battery, comprising:
graphite particles as negative electrode active materials; and
a supported material being supported by the graphite particles, wherein
the graphite particles have phenolic hydroxy groups,
the supported material has surface hydroxy groups, and
a ratio of an amount B (mmol/g) of the surface hydroxy groups in the supported material to an amount A (mmol/g) of the phenolic hydroxy groups in the graphite particles is 30 or more and 150 or less.

### Claim 2 (depends on 1)

The negative electrode of a nonaqueous lithium-ion secondary battery according to claim 1, wherein
the supported material is at least one selected from the group consisting of SiO2, Al2O3, and carbon black.

### Claim 3 (depends on 1)

A nonaqueous lithium-ion secondary battery comprising:
a positive electrode;
the negative electrode according to claim 1; and
a nonaqueous electrolyte, wherein
the nonaqueous electrolyte includes LiPF6 and lithium-bis(fluorosulfonyl)imide.

### Claim 4 (depends on 2)

A nonaqueous lithium-ion secondary battery comprising:
a positive electrode;
the negative electrode according to claim 2; and
a nonaqueous electrolyte, wherein
the nonaqueous electrolyte includes LiPF6 and lithium-bis(fluorosulfonyl)imide.