The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 2010
Filed:
Jul. 18, 2008
Positive electrode active substance for lithium secondary battery and process for producing the same
Applicants:
Manabu Suhara, Kanagawa, JP;
Naoshi Saito, Kanagawa, JP;
Kazushige Horichi, Kanagawa, JP;
Megumi Uchida, Kanagawa, JP;
Inventors:
Manabu Suhara, Kanagawa, JP;
Naoshi Saito, Kanagawa, JP;
Kazushige Horichi, Kanagawa, JP;
Megumi Uchida, Kanagawa, JP;
Assignee:
Seimi Chemical Co., Ltd., Chigasaki-shi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01M 4/58 (2010.01); H01M 4/00 (2010.01); H01M 4/88 (2010.01); C01D 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A positive electrode active material is produced by firing, as a cobalt source, a mixture of a) substantially spherical large particle size cobalt hydroxide or tricobalt tetraoxide having a sharp particle size distribution, and b) small particle size cobalt hydroxide or tricobalt tetraoxide, in a proportion of from 9:1 to 1:2 as the cobalt atomic ratio, at a temperature of from 700° C. to 1050° C. in an oxygen-comprising atmosphere.