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. 29, 2014
Filed:
Jun. 10, 2011
Asuki Yanagihara, Fukushima, JP;
Tomoyo Ooyama, Fukushima, JP;
Yoshihiro Kudo, Tokyo, JP;
Guohua LI, Saitama, JP;
Asuki Yanagihara, Fukushima, JP;
Tomoyo Ooyama, Fukushima, JP;
Yoshihiro Kudo, Tokyo, JP;
Guohua Li, Saitama, JP;
Sony Corporation, , JP;
Abstract
A positive electrode active material includes: a secondary particle obtained upon aggregation of a primary particle that is a lithium complex oxide particle in which at least nickel (Ni) and cobalt (Co) are solid-solved as transition metals, wherein an average composition of the whole of the secondary particle is represented by the following formula (1):LiCoNiMOX  Formula (1)wherein an existent amount of cobalt (Co) becomes large from a center of the primary particle toward the surface thereof; and an existent amount of cobalt (Co) in the primary particle existing in the vicinity of the surface of the secondary particle is larger than an existent amount of cobalt (Co) in the primary particle existing in the vicinity of the center of the secondary particle.