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:
Mar. 23, 2010
Filed:
Sep. 22, 2005
Shouichirou Sawa, Tokushima, JP;
Hiroshi Minami, Kobe, JP;
Atsushi Fukui, Kobe, JP;
Taizou Sunano, Tokushima, JP;
Takuya Sunagawa, Naruto, JP;
Maruo Kamino, Tokushima, JP;
Toshio Yanagida, Tokushima, JP;
Shouichirou Sawa, Tokushima, JP;
Hiroshi Minami, Kobe, JP;
Atsushi Fukui, Kobe, JP;
Taizou Sunano, Tokushima, JP;
Takuya Sunagawa, Naruto, JP;
Maruo Kamino, Tokushima, JP;
Toshio Yanagida, Tokushima, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A lithium secondary battery having high capacity and good charge-discharge cycle performance is provided. The lithium secondary battery includes a negative electrode () containing silicon as a negative electrode active material, a positive electrode () containing a positive electrode active material, and a non-aqueous electrolyte. The positive electrode active material is a lithium-transition metal composite oxide including a layered structure represented by the chemical formula LiNiMnCoO, where a, x, y, and z satisfy the expressions: 0≦a≦1.3, x+y+z=1, 0<x, 0≦y≦0.5, and 0≦z.), and the theoretical electrical capacity ratio of the positive electrode to the negative electrode (positive electrode/negative electrode) is 1.2 or less.