Patent ID: 8790829
Filing Date: 2014-07-29
Classification: H01M,Y02E

Abstract:
1. A nonaqueous secondary battery comprising a positive electrode, a negative electrode, a nonaqueous electrolyte, and a separator, wherein the negative electrode includes a negative electrode mixture layer containing, as negative electrode active materials, a graphite carbon material and a material containing Si as a constituent element, the positive electrode includes a positive electrode mixture layer containing, 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 %: 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, and wherein of the lithium-containing composite oxide represented by the general composition formula (1) Ni has an average valence of 2.5 to 3.2, Co has an average valence of 2.5 to 3.2, Mn has an average valence of 3.5 to 4.2, and Mg has an average valence of 1.8 to 2.2.