Patent number: 8790829
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 %: Li1+yMO2??(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.
Type:
Grant
Filed:
September 8, 2011
Date of Patent:
July 29, 2014
Assignee:
Hitachi Maxell, Ltd.
Inventors:
Satoshi Kono, Masayuki Yamada, Akira Inaba, Kazutaka Matsuo