Method of manufacturing electrode slurry for lithium secondary battery, and electrode slurry

Patent metadata

Field	Value
Publication number	US-10374233-B2
Application number	US-201414778403-A
Country	US
Kind code	B2
Filing date	Mar 11, 2014
Priority date	Mar 18, 2013
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

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.

First claim

The invention claimed is:

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.

2. 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.

3. 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.

4. 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.

5. 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.

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

7. 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.

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

Assignees

• Fdk Corp

Inventors

• Ochiai Yuki
• Yamamoto Keita

Classifications

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/625 Primary

  Carbon or graphite · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title