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:
Dec. 25, 2012
Filed:
Dec. 02, 2004
Atsushi Fukui, Tokushima, JP;
Hiroshi Minami, Tokushima, JP;
Shoichiro Sawa, Tokushima, JP;
Mariko Torimae, Kobe, JP;
Yasuyuki Kusumoto, Kobe, JP;
Maruo Kamino, Tokushima, JP;
Atsushi Fukui, Tokushima, JP;
Hiroshi Minami, Tokushima, JP;
Shoichiro Sawa, Tokushima, JP;
Mariko Torimae, Kobe, JP;
Yasuyuki Kusumoto, Kobe, JP;
Maruo Kamino, Tokushima, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A lithium secondary battery of the present invention comprises a positive electrode formed by disposing a positive-electrode mixture layer containing a positive-electrode active material and a positive-electrode binder, on a surface of a positive-electrode current collector; a negative electrode formed by sintering a negative-electrode mixture layer containing a negative-electrode binder and a negative-electrode active material containing silicon and/or a silicon alloy, disposed on a surface of a negative-electrode current collector; a separator disposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte; wherein an electrode unit obtained by setting the positive electrode and the negative electrode opposed to each other through the separator and rolling them in spirally rolled state is placed in a cylindrical battery container and wherein a curvature radius of the negative-electrode mixture layer opposed to the positive-electrode mixture layer through the separator in the spirally rolled state is 1.5 mm or larger.