# US 12,603,284 B2 · Manufacturing method of anode active material and secondary battery comprising the same

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- Number: US 12,603,284 B2
- Document ID: US12603284B2
- Status: Granted
- Kind: B2
- Application number: 18/006,542
- Filed: 2021-07-09
- Published: 2023-09-21
- Granted: 2026-04-14
- Earliest claimed: 2020-07-24
- Assignees: Fic Advanced Materials, Inc.
- Applicants: Fic Advanced Materials, Inc.
- Inventors: Sung Woon Yoo; Hyun Ho Lee; Byung Gwan Lee
- Web page: https://patentgrep.com/patent/US12603284B2

## CPC

- H01M 4/587: for inserting or intercalating light metals
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- 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

The present invention relates to a method for preparing an anode active material including the steps of: obtaining graphite byproduct particles that have not been spheroidized in a step of pulverizing and spheroidizing flaky graphite particles; preparing coated particles by liquid phase mixing the graphite byproduct particles with composite particles to coat the surface of the graphite byproduct particles with the composite particles; spheroidizing the coated particles by performing an isostatic pressing process thereon; and pulverizing the coated particles and coating the surface thereof with amorphous carbon to prepare spherical graphite.

## Claims

### Claim 1

A method for preparing an anode active material, the method comprising the steps of:
obtaining graphite byproduct particles having a particle size of 3 to 6 μm in a step of pulverizing and spheroidizing flaky graphite particles having a particle size of 30 to 200 μm;
preparing coated particles by liquid phase mixing the graphite byproduct particles with composite particles to coat a surface of the graphite byproduct particles with the composite particles;
spheroidizing the coated particles by performing an isostatic pressing process thereon in conditions of a pressure of 40 to 500 kgf/cm2, a temperature of 10 to 150° C., and a time of 1 to 10 hours, using a mixed fluid of water with 5 to 10 vol % of hexane; and
pulverizing the coated particles and coating a surface of the coated particles with amorphous carbon to prepare spherical graphite.

### Claim 2 (depends on 1)

The method for preparing an anode active material according to claim 1, wherein the composite particles include any one of silicon (Si), tin (Sn), antimony (Sb), aluminum (Al), germanium (Ge), zinc (Zn), lead (Pb), or a mixture of two or more thereof, or an oxide of the above components, or a mixture of two or more of the oxides.