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. 29, 2014
Filed:
Sep. 08, 2011
Satoshi Kono, Kyoto, JP;
Masayuki Yamada, Kyoto, JP;
Akira Inaba, Kyoto, JP;
Kazutaka Matsuo, Kyoto, JP;
Satoshi Kono, Kyoto, JP;
Masayuki Yamada, Kyoto, JP;
Akira Inaba, Kyoto, JP;
Kazutaka Matsuo, Kyoto, JP;
Hitachi Maxell, Ltd., Ibaraki-Shi, Osaka, JP;
Abstract
The present invention provides a nonaqueous secondary battery with a high capacity, an excellent level of safety, and excellent charge-discharge cycle characteristics. The negative electrode contains, as negative electrode active materials, a graphite carbon material and a material containing Si as a constituent element, and the positive electrode includes, as a positive electrode active material, a lithium-containing composite oxide represented by the following general composition formula (1) and containing sulfur in a range of 0.01 mass % to 0.5 mass %:LiMO  (1) where y satisfies −0.3≦y<0.3, M represents a group of five or more elements including Ni, Co, Mn, Mg and at least one of Al, Ba, Sr, Ti and Zr, and when a, b, c and d represent Ni, Co, Mn, and Mg, respectively, in mol % and e represents a total of Al, Ba, Sr, Ti and Zr in mol % of all of the elements making up M, a, b, c, d, and e satisfy 70≦a≦97, 0.5<b<30, 0.5<c<30, 0.5<d<30, −10<c−d<10, −8≦(c−d)/d≦8, and e<10.