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:
Sep. 18, 2007
Filed:
May. 13, 2005
Manabu Suhara, Chigasaki, JP;
Naoshi Saito, Chigasaki, JP;
Kazushige Horichi, Chigasaki, JP;
Koji Tatsumi, Chigasaki, JP;
Manabu Suhara, Chigasaki, JP;
Naoshi Saito, Chigasaki, JP;
Kazushige Horichi, Chigasaki, JP;
Koji Tatsumi, Chigasaki, JP;
Seimi Chemical Co., Ltd., Chigasaki-shi, JP;
Abstract
To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.