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. 10, 2012
Filed:
Feb. 12, 2007
Masayuki Yamada, Osaka, JP;
Kazutaka Uchitomi, Osaka, JP;
Qiao Shi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Kazunobu Matsumoto, Osaka, JP;
Masayuki Yamada, Osaka, JP;
Kazutaka Uchitomi, Osaka, JP;
Qiao Shi, Osaka, JP;
Hiroshi Fukunaga, Osaka, JP;
Kazunobu Matsumoto, Osaka, JP;
Hitachi Maxell Energy, Ltd., Otokuni-Gun, Kyoto, JP;
Abstract
A non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode material mixture layer containing a lithium-containing transition metal oxide. The negative electrode includes a negative electrode material mixture layer and a porous layer containing an insulating material unreactive with lithium formed thereon. The negative electrode material mixture layer includes a negative electrode material including a core and a carbon covering layer covering a surface of the core. The core includes a material containing silicon and oxygen at an atomic ratio x of the oxygen to the silicon of 0.5≦×≦1.5. The material containing silicon and oxygen has a peak at least in a range of 1850 to 1860 eV in an X-ray absorption near edge structure spectrum at the K absorption edge of Si in a state in which discharge of the battery is finished.