Method for producing granulated particles for electrochemical device, electrode for electrochemical device, and electrochemical device

Patent metadata

Field	Value
Publication number	US-11331675-B2
Application number	US-201414900393-A
Country	US
Kind code	B2
Filing date	Aug 19, 2014
Priority date	Aug 26, 2013
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

A step of obtaining a mixture by adding 0.3 parts by weight to 10 parts by weight of a particulate binder dispersion, which has a solid content concentration of 20% by weight to 60% by weight in terms of a solid content, to 100 parts by weight of an electrode active material; a kneading step of stirring the mixture by a kneading blade to obtain a uniformly dispersed mixture; a crushing step of crushing the uniformly dispersed mixture by a crushing blade to obtain granulated particles; and a drying step of drying the granulated particles are included.

First claim

The invention claimed is:

1. A method for producing granulated particles for an electrochemical device, comprising:
a step of obtaining a mixture by adding 0.3 to 5 parts by weight of a particulate binder dispersion by spraying, the particulate binder dispersion having a solid content concentration of 25% to 50% by weight in terms of a solid content, to 100 parts by weight of a lithium-containing metal oxide as an electrode active material comprising a dried powder;
a kneading step of kneading the electrode active material into the particulate binder dispersion by stirring the mixture with a kneading blade at a kneading temperature of 5° C. to 95° C. and a kneading energy inputted to the mixture with the kneading blade of 70 to 200 MJ/m 3 to obtain a uniformly dispersed mixture;
a crushing step of crushing the uniformly dispersed mixture with a crushing blade at a crushing temperature of 5 to 100° C. and a crushing energy inputted to the uniformly dispersed mixture with the crushing blade of 10 to 200 MJ/m 3 to obtain granulated particles; and
a drying step of drying the granulated particles at a temperature range of 10° C. to 50° C.

2. The method for producing granulated particles for an electrochemical device according to claim 1 , wherein
a dispersion medium is added in at least one step selecting from the kneading step and the crushing step.

3. The method for producing granulated particles for an electrochemical device according to claim 1 , wherein
a granulator equipped with a kneading blade, a crushing blade, and a scraper is used in the crushing step.

4. The method for producing granulated particles for an electrochemical device according to claim 1 , wherein
a volume average particle diameter D50 of the granulated particles for an electrochemical device to be obtained is from 10 μm to 350 μm.

5. An electrode for an electrochemical device obtained by dry molding the granulated particles for an electrochemical device to be obtained by the method for producing granulated particles for an electrochemical device according to claim 1 .

6. An electrochemical device, comprising the electrode for an electrochemical device according to claim 5 .

7. The method for producing granulated particles for an electrochemical device according to claim 2 , wherein
a granulator equipped with a kneading blade, a crushing blade, and a scraper is used in the crushing step.

8. The method for producing granulated particles for an electrocchemical device according to claim 2 , wherein
a volume average particle diameter D50 of the granulated particles for an electrochemical device to be obtained is from 10 μm to 350 μm.

9. The method for producing granulated particles for an electrochemical device according to claim 3 , wherein
a volume average particle diameter D50 of the granulated particles for an electrochemical device to be obtained is from 10 μm to 350 μm.

10. An electrode for an electrochemical device obtained by dry molding the granulated particles for an electrochemical device to be obtained by the method for producing granulated particles for an electrochemical device according to claim 2 .

11. An electrode for an electrochemical device obtained by dry molding the granulated particles for an electrochemical device to be obtained by the method for producing granulated particles for an electrochemical device according to claim 3 .

12. An electrode for an electrochemical device obtained by dry molding the granulated particles for an electrochemical device to be obtained by the method for producing granulated particles for an electrochemical device according to claim 4 .

Assignees

• Zeon Corp

Inventors

• Goto Nobuyuki

Classifications

• H01M4/0416

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title

• H01M10/0525

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

• H01G11/42 Primary

  Powders or particles, e.g. composition thereof · CPC title

• B02C23/06

  Selection or use of additives to aid disintegrating · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title