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:
Jul. 19, 2011
Filed:
Aug. 03, 2010
Manabu Suhara, Kanagawa, JP;
Naoshi Saito, Kanagawa, JP;
Kazushige Horichi, Kanagawa, JP;
Megumi Uchida, Kanagawa, JP;
Manabu Suhara, Kanagawa, JP;
Naoshi Saito, Kanagawa, JP;
Kazushige Horichi, Kanagawa, JP;
Megumi Uchida, Kanagawa, JP;
Seimi Chemical Co., Ltd., Chigasaki-shi, JP;
Abstract
A positive electrode active material for a lithium secondary battery containing a lithium-cobalt composite oxide is produced by firing, as a cobalt source, a mixture of substantially spherical cobalt hydroxide or tricobalt tetraoxide having such a sharp particle size distribution that the average particle size D50 is from 7 to 20 μm, and cobalt oxyhydroxide having an average particle size of secondary particles formed by agglomeration of primary particles of from 7 to 20 μm, in a proportion of from 5:1 to 1:5 as the cobalt atomic ratio, at a temperature of from 700° C. to 1050° C. in an oxygen-comprising atmosphere.