# US 11,444,276 B2 · Silicon-graphite composite, preparation method thereof, and lithium battery anode and lithium battery containing silicon-graphite composite

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- Number: US 11,444,276 B2
- Document ID: US11444276B2
- Status: Granted
- Kind: B2
- Application number: 17/012,004
- Filed: 2020-09-03
- Published: 2021-06-17
- Granted: 2022-09-13
- Earliest claimed: 2019-12-12
- Assignees: CALB Technology Co., Ltd.; CALB Co., Ltd.
- Applicants: CALB Technology Co., Ltd.; CALB Co., Ltd.
- Inventors: Jianbo Ye; Xuyi Shan; Zhimin Wang
- Web page: https://patentgrep.com/patent/US11444276B2

## CPC

- C01B 32/21: After-treatment
- H01M 4/366: {as layered products}
- C01B 32/20: Graphite
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/364: {as mixtures}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/052: Li-accumulators
- 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 silicon-graphite composite, a preparation method thereof, and a lithium battery anode and a lithium battery containing the silicon-graphite composite are provided in an embodiment of the disclosure. The silicon-graphite composite includes graphite and a silicon source fiber. The silicon source fiber is embedded in an interlayer structure of the graphite. The silicon-graphite composite is used as an anode material of the lithium battery in an embodiment of the disclosure.

## Claims

### Claim 1

A silicon-graphite composite, comprising a graphite and a silicon source fiber, wherein the silicon source fiber is embedded in an interlayer structure of the graphite.

### Claim 2 (depends on 1)

The silicon-graphite composite according to claim 1, wherein the graphite is a flake graphite with a roughness Ra of not less than 10.

### Claim 3 (depends on 1)

The silicon-graphite composite according to claim 1, wherein the silicon source fiber is a silicon source fiber with a roughness Ra of not less than 10.

### Claim 4 (depends on 2)

The silicon-graphite composite according to claim 2, wherein the silicon source fiber is a silicon source fiber with a roughness Ra of not less than 10.

### Claim 5 (depends on 1)

The silicon-graphite composite according to claim 1, further comprising a carbon coating layer, wherein the carbon coating layer coats the graphite and the silicon source fiber.

### Claim 6 (depends on 2)

The silicon-graphite composite according to claim 2, further comprising a carbon coating layer, wherein the carbon coating layer coats the graphite and the silicon source fiber.

### Claim 7 (depends on 3)

The silicon-graphite composite according to claim 3, further comprising a carbon coating layer, wherein the carbon coating layer coats the graphite and the silicon source fiber.

### Claim 8 (depends on 4)

The silicon-graphite composite according to claim 4, further comprising a carbon coating layer, wherein the carbon coating layer coats the graphite and the silicon source fiber.

### Claim 9

A preparation method of a silicon-graphite composite, comprising:
providing a silicon source fiber; and
mixing the silicon source fiber and a flake graphite in a solvent, and calcining after removing the solvent to obtain the silicon-graphite composite; wherein
the calcination process is performed in an oxygen-free atmosphere.

### Claim 10 (depends on 9)

The preparation method according to claim 9, comprising:
mixing the silicon source fiber and an organic carbon source to obtain an organic carbon source-silicon source composite fiber; and
mixing the organic carbon source-silicon source composite fiber and the flake graphite in the solvent, and calcining after removing the solvent to obtain the silicon-graphite composite; wherein
the organic carbon source is selected from one or more of a carbohydrate an organic acid, and fats and oils.

### Claim 11 (depends on 9)

The preparation method according to claim 9, wherein a preparation of the flake graphite comprises:
dispersing a flake oxidized graphite in a solvent to form a dispersion liquid; and
spray-drying the dispersion liquid to obtain the flake graphite with a roughness Ra of not less than 10.

### Claim 12 (depends on 9)

The preparation method according to claim 9, wherein the calcination process is performed in an organic atmosphere.

### Claim 13 (depends on 10)

The preparation method according to claim 10, wherein the calcination process is performed in an organic atmosphere.

### Claim 14 (depends on 11)

The preparation method according to claim 11, wherein the calcination process is performed in an organic atmosphere.

### Claim 15 (depends on 1)

A lithium battery, comprising an anode, the anode comprises the silicon-graphite composite according to claim 1.

### Claim 16 (depends on 9)

A lithium battery, comprising an anode, the anode comprises a silicon-graphite composite obtained by the preparation method according to claim 9.