# US 10,312,544 B2 · Method for manufacturing electrode active material

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- Number: US 10,312,544 B2
- Document ID: US10312544B2
- Status: Granted
- Kind: B2
- Application number: 13/637,070
- Filed: 2010-03-26
- Published: 2013-03-07
- Granted: 2019-06-04
- Earliest claimed: 2010-03-26
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Hideyuki Yamamura; Seishu Komune; Yasuaki Yamaguchi
- Inventors: Hideyuki Yamamura; Seishu Komune; Yasuaki Yamaguchi
- Web page: https://patentgrep.com/patent/US10312544B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/366: {as layered products}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/625: {Carbon or graphite}
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The method for manufacturing a particulate electrode active material provided by the present invention uses a carbon source supply material prepared by dissolving a carbon source (102) for forming a carbon coating film in a predetermined first solvent, and an electrode active material supply material prepared by dispersing a particulate electrode active material (104) in a second solvent that is compatible with the first solvent and is a poor solvent with respect to the carbon source. The carbon source supply material and the electrode active material supply material are mixed and a mixture of the electrode active material and the carbon source obtained after the mixing is calcined, thereby forming a conductive carbon film derived from the carbon source on the surface of the electrode active material.

## Claims

### Claim 1

A method for manufacturing a particulate electrode active material having a surface covered with a conductive carbon coating film, the method comprising:
preparing a carbon source supply material prepared by dissolving a water-soluble organic compound as a carbon source for forming the carbon coating film in water as a first solvent in which the particulate electrode active material, which is the object of coating, can be dispersed, wherein the water-soluble organic compound is selected from the group consisting of polyvinyl alcohol, polyacrylic acid, polyacrylamide, polyethylene oxide, and polyethylene glycol;
preparing an electrode active material supply material prepared by dispersing the particulate electrode active material, which is the object of coating, in a non-aqueous solvent as a second solvent that is compatible with water, that allows the particulate electrode active material to be dispersed therein, and that is a poor solvent with respect to the carbon source;
preparing a mixed material in which the prepared carbon source supply material and electrode active material supply material are mixed;
adding all of the mixed material to a third solvent consisting of an aprotic polar solvent that is a solvent different from the second solvent, that allows the particulate electrode active material to be dispersed therein, and that is a poor solvent with respect to the carbon source; and
forming a conductive carbon coating film derived from the carbon source on a surface of the electrode active material by calcining a mixture of the electrode active material and the carbon source after the addition to the third solvent.

### Claim 2 (depends on 1)

The manufacturing method according to claim 1, wherein the electrode active material is mainly formed of a silicon oxide represented by a general formula SiOx, where x in the formula is a real number satisfying the condition 0<x<2.

### Claim 3 (depends on 1)

The manufacturing method according to claim 1, wherein the carbon source is polyvinyl alcohol, and the second solvent is a lower alcohol with a number of carbon atoms equal to or less than five.

### Claim 4 (depends on 1)

The manufacturing method according to claim 1, wherein the mixed material is subjected to reflux processing before the calcining.

### Claim 5 (depends on 1)

The manufacturing method according to claim 1, wherein the third solvent is acetone or acetonitrile.

### Claim 6 (depends on 1)

The manufacturing method according to claim 1, wherein the mixed material is prepared by mixing the carbon source supply material and the electrode active material supply material so that the carbon source is mixed at 1 to 5 parts by weight per 1 part by weight of the particulate electrode active material.