# US 10,374,233 B2 · Method of manufacturing electrode slurry for lithium secondary battery, and electrode slurry

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- Number: US 10,374,233 B2
- Document ID: US10374233B2
- Status: Granted
- Kind: B2
- Application number: 14/778,403
- Filed: 2014-03-11
- Published: 2016-09-22
- Granted: 2019-08-06
- Earliest claimed: 2013-03-18
- Assignees: Fdk Corporation
- Applicants: Fdk Corporation
- Inventors: Yuki Ochiai; Keita Yamamoto
- Web page: https://patentgrep.com/patent/US10374233B2

## CPC

- H01M 4/625: {Carbon or graphite}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/139: Processes of manufacture
- H01M 4/622: {being polymers}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 10/052: Li-accumulators
- 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

Slurry is prepared by dispersing a solvent containing fibrous carbon (carbon nanotube, vapor grown carbon fiber (VGCF (registered trademark))) by using a media-type disperser, and the slurry to be applied to a collector is obtained by kneading the prepared slurry and an electrode active material. As a media-type disperser, for example, a ball mill disperser or a bead mill disperser is used. The dispersion using the media-type disperser is performed for 5 to 10 hours. As a dispersant, for example, at least any one of a nonionic dispersant, an ethylenic dispersant, a polymeric dispersant and an amine dispersant is used. The dispersion is performed so that a fiber length of the fibrous carbon becomes 2 to 7 μm.

## Claims

### Claim 1

A method of manufacturing electrode slurry for a lithium secondary battery, the method comprising:
a first step of obtaining a kneaded material by dry-kneading an electrode active material and a binder;
a second step of dispersing a solvent comprising fibrous carbon, water, and a nonionic polymer, using a media-type disperser to obtain a slurry, wherein the fibrous carbon is a conductive material;
a third step of wet-kneading the slurry obtained in the second step and the kneaded material obtained in the first step and water;
a fourth step of wet-kneading by adding water to a kneaded material obtained in the third step;
a fifth step of wet-kneading by adding a binder to a kneaded material obtained in the fourth step; and
a sixth step of obtaining an electrode slurry to be applied to a collector by agitating and defoaming a kneaded material obtained in the fifth step,
a fiber length of the fibrous carbon in the electrode slurry obtained in the sixth step being 2 to 7 μm.

### Claim 2 (depends on 1)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 1, wherein
the media-type disperser is a ball mill disperser.

### Claim 3 (depends on 1)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 1, wherein
the second step is independent of the first step, and
the media-type disperser used in the second step is a ball mill disperser using zirconia balls (Zr balls) as media.

### Claim 4 (depends on 2)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 2, wherein
the second step is independent of the first step, and
the second step is dispersing the solvent for 5 to 10 hours by the ball mill disperser.

### Claim 5 (depends on 1)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 1, wherein
the media-type disperser is a bead mill disperser.

### Claim 6 (depends on 1)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 1, wherein
the fibrous carbon is a carbon nanotube.

### Claim 7 (depends on 6)

The method of manufacturing the electrode slurry for the lithium secondary battery according to claim 6, wherein
the fibrous carbon is a vapor grown carbon fiber.

### Claim 8 (depends on 1)

An electrode slurry for a lithium secondary battery, the electrode slurry being manufactured by the method according to claim 1.