Patent ID: 7767343
Filing Date: 2010-08-03
Classification: H01M,Y02E

Abstract:
1. A nonaqueous electrolyte secondary battery including a negative electrode containing a graphite material as the negative active material, a positive electrode containing lithium cobalt oxide as a main component of the positive active material and a nonaqueous electrolyte solution, said battery being characterized in that said lithium cobalt oxide contains 0.05-2.0 mol. % of a group IVA element selected from the group consisting of Ti, Zr and Hf and 0.1-2.0 mol. % of a group IIA element of the periodic table with respect to a total amount of the metal elements other than lithium and said nonaqueous electrolyte solution contains 0.2-1.5% by weight of a sulfonyl-containing compound, and wherein said lithium cobalt oxide is obtained by mixing raw materials for preparing a lithium cobalt oxide with raw materials of said group IVA element and said group IIA element and heat treating the mixed raw materials.