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. 29, 2011
Filed:
Dec. 26, 2007
Motoharu Saito, Hyogo, JP;
Hideyuki Koga, Shizuoka, JP;
Katsutoshi Takeda, Tokushima, JP;
Hiroshi Sawada, Aichi, JP;
Masahisa Fujimoto, Osaka, JP;
Motoharu Saito, Hyogo, JP;
Hideyuki Koga, Shizuoka, JP;
Katsutoshi Takeda, Tokushima, JP;
Hiroshi Sawada, Aichi, JP;
Masahisa Fujimoto, Osaka, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A mixed positive electrode active material is used. The mixed positive electrode active material is obtained by mixing a layered oxide whose initial charge-discharge efficiency when lithium metal is used for a counter electrode is less than 100% (hereinafter referred to as a first layered oxide) and a layered oxide whose initial charge-discharge efficiency is 100% or more (hereinafter referred to as a second layered oxide). Examples of the first layered oxide include LiMnCoNiO. A sodium oxide such as LiNaMnCoNiOother than a layered compound from which lithium is previously extracted by acid treatment or the like can be used as the second layered oxide whose initial charge-discharge efficiency is 100% or more. A layered oxide obtained by replacing (ion exchange) sodium in the foregoing LiNaMnCoNiOwith lithium can be also used as the second layered oxide.