# US 2022/0285684 A1 · Negative electrode material for lithium ion secondary battery, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

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- Number: US 2022/0285684 A1
- Document ID: US20220285684A1
- Status: Published application
- Kind: A1
- Application number: 17/631,857
- Filed: 2019-07-31
- Published: 2022-09-08
- Earliest claimed: 2019-07-31
- Assignees: Showa Denko Materials Co., Ltd.
- Applicants: Showa Denko Materials Co., Ltd.
- Inventors: Takayuki MIYAUCHI; Takeshi SATO; Yusuke IKEDA; Takuya KAGAWA
- Web page: https://patentgrep.com/patent/US20220285684A1

## CPC

- C01B 32/21: After-treatment
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- 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 material for a lithium ion secondary battery includes particles in a state in which a plurality of flat graphite particles are aggregated or bonded, and in the negative electrode material, with respect to a volume-based particle diameter measured by a laser diffraction/scattering method, a cumulative value at 9.516 μm is 8.0% or less, a standard deviation of a particle size distribution is 0.22 or less, and a specific surface area is 3.0 m2/g or less.

## Claims

### Claim 1

A negative electrode material for a lithium ion secondary battery, the negative electrode material comprising particles in a state in which a plurality of flat graphite particles are aggregated or bonded,
wherein, with respect to a volume-based particle diameter measured by a laser diffraction/scattering method, a cumulative value at 9.516 μm is 8.0% or less, a standard deviation of a particle size distribution is 0.22 or less, and a specific surface area is 3.0 m2/g or less.

### Claim 2 (depends on 1)

The negative electrode material for a lithium ion secondary battery according to claim 1, wherein a graphitization degree of the negative electrode material is 93% or more.

### Claim 3 (depends on 1)

The negative electrode material for a lithium ion secondary battery according to claim 1, wherein the specific surface area is from 0.5 m2/g to 2.5 m2/g.

### Claim 4 (depends on 1)

The negative electrode material for a lithium ion secondary battery according to claim 1, wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.

### Claim 5 (depends on 1)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 1, disposed on the current collector.

### Claim 6 (depends on 5)

A lithium ion secondary battery, comprising:
a positive electrode;
the negative electrode for a lithium ion secondary battery according to claim 5; and
an electrolyte.

### Claim 7 (depends on 2)

The negative electrode material for a lithium ion secondary battery according to claim 2, wherein the specific surface area is from 0.5 m2/g to 2.5 m2/g.

### Claim 8 (depends on 2)

The negative electrode material for a lithium ion secondary battery according to claim 2, wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.

### Claim 9 (depends on 3)

The negative electrode material for a lithium ion secondary battery according to claim 3, wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.

### Claim 10 (depends on 7)

The negative electrode material for a lithium ion secondary battery according to claim 7, wherein a springback rate of a composition layer containing the negative electrode material for a lithium ion secondary battery is from 2.0% to 4.0%.

### Claim 11 (depends on 2)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 2, disposed on the current collector.

### Claim 12 (depends on 3)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 3, disposed on the current collector.

### Claim 13 (depends on 4)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 4, disposed on the current collector.

### Claim 14 (depends on 7)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 7, disposed on the current collector.

### Claim 15 (depends on 8)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 8, disposed on the current collector.

### Claim 16 (depends on 9)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 9, disposed on the current collector.

### Claim 17 (depends on 10)

A negative electrode for a lithium ion secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material layer containing the negative electrode material for a lithium ion secondary battery according to claim 10, disposed on the current collector.