# US 2022/0285686 A1 · Globular carbon-based anode active material, method for manufacturing same, and anode and lithium secondary battery comprising same

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- Number: US 2022/0285686 A1
- Document ID: US20220285686A1
- Status: Published application
- Kind: A1
- Application number: 17/641,277
- Filed: 2020-09-29
- Published: 2022-09-08
- Earliest claimed: 2019-10-04
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Hyun-Chul KIM; Sang-Wook WOO; Chang-Ju LEE
- Web page: https://patentgrep.com/patent/US20220285686A1

## CPC

- H01M 4/362: {Composites}
- H01M 4/587: for inserting or intercalating light metals
- C01B 32/05: Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
- C01B 32/21: After-treatment
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- C01P 2004/32: Spheres
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/80: Particles consisting of a mixture of two or more inorganic phases
- C01P 2004/84: one phase coated with the other
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/40: Electric properties
- 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
- Y02P 20/133: Renewable energy sources, e.g. sunlight
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A method for preparing a spheronized carbonaceous negative electrode active material, including the steps of: mixing scaly graphite, solid pitch and liquid pitch to form a mixture, and spheronizing the mixture to prepare spheronized granulated particles; firing the spheronized granulated particles; carrying out carbon coating of the fired spheronized granulated particles to form carbon-coated spheronized granulated particles; heat treating the carbon-coated spheronized granulated particles; and disintegrating the heat treated carbon-coated spheronized granulated particles.

## Claims

### Claim 1

A method for preparing a spheronized carbonaceous negative electrode active material, comprising the steps of:
mixing scaly graphite, solid pitch and liquid pitch to form a mixture, and spheronizing the mixture to prepare spheronized granulated particles;
firing the spheronized granulated particles;
carrying out carbon coating of the fired spheronized granulated particles to form carbon-coated spheronized granulated particles;
heat treating the carbon-coated spheronized granulated particles; and
disintegrating the heat treated carbon-coated spheronized granulated particles.

### Claim 2 (depends on 1)

The method for preparing the spheronized carbonaceous negative electrode active material according to claim 1, wherein a weight ratio of scaly graphite to a mixture of solid pitch with liquid pitch is 92:8 to 98:2.

### Claim 3 (depends on 1)

The method for preparing the spheronized carbonaceous negative electrode active material according to claim 1, wherein a weight ratio of solid pitch to liquid pitch is 50:50 to 90:10.

### Claim 4

A spheronized carbonaceous negative electrode active material, having a specific surface area of from 1.0 m2/g to 2.5 m2/g and a total pore volume of from 0.7 e−2 m3/g to 1.8 e−2 m3/g, and pores having a size of 24 nm or more in the spheronized carbonaceous negative electrode active material and the pores have a specific surface area of 0.2 m2/g to 0.6 m2/g.

### Claim 5 (depends on 4)

The spheronized carbonaceous negative electrode active material according to claim 4, wherein the specific surface area of the spheronized carbonaceous negative electrode active material ranges from 1.0 m2/g to 2.0 m2/g.

### Claim 6 (depends on 4)

The spheronized carbonaceous negative electrode active material according to claim 4, wherein the total pore volume ranges from 0.8 e−2 m3/g to 1.4 e−2 m3/g.

### Claim 7 (depends on 4)

The spheronized carbonaceous negative electrode active material according to claim 4, wherein the specific surface area of the pores having a size of 24 nm or more in the negative electrode active material have ranges from 0.3 m2/g to 0.5 m2/g.

### Claim 8 (depends on 4)

The spheronized carbonaceous negative electrode active material according to claim 4, having an average particle diameter of 10 μm to 20 μm.

### Claim 9 (depends on 4)

The spheronized carbonaceous negative electrode active material according to claim 4, having a sphericity of 0.82 to 0.98.

### Claim 10 (depends on 4)

A negative electrode, comprising:
a current collector, and
a negative electrode active material layer on at least one surface of the current collector,
wherein the negative electrode active material layer comprises the spheronized carbonaceous negative electrode active material as defined in claim 4.

### Claim 11 (depends on 10)

A lithium secondary battery comprising the negative electrode as defined in claim 10.