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:
Apr. 05, 2011
Filed:
Nov. 04, 2005
Yasutaka Kogetsu, Suita, JP;
Kazuyoshi Honda, Takatsuki, JP;
Toshitada Sato, Osaka, JP;
Hiroshi Yoshizawa, Hirakata, JP;
Yasutaka Kogetsu, Suita, JP;
Kazuyoshi Honda, Takatsuki, JP;
Toshitada Sato, Osaka, JP;
Hiroshi Yoshizawa, Hirakata, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A negative electrode for a lithium ion secondary battery of the present invention includes a current collector and an active material layer carried on the current collector. The active material layer contains silicon and oxygen. In the thickness direction of the active material layer, an oxygen ratio of the active material is greater at the side of the active material layer in contact with the current collector than at the side of the active material layer not in contact with the current collector. The active material layer contains no binder. By using the negative electrode described above, it is possible to provide a high capacity lithium ion secondary battery having superior high rate charge/discharge characteristics and excellent cycle characteristics.