| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery that can improve its reliability during high temperature storage by using a composite oxide, as a positive electrode active material, in which the content of sulfur is not more than 4000 ppm and which includes lithium and manganese. SOLUTION: In a nonaqueous electrolyte secondary battery that includes a negative electrode active material capable of occluding and effusing lithium ions, a lithium ion conductive nonaqueous electrolyte and a positive electrode active material formed from a lithium containing metal oxide capable of occluding and effusing lithium ions, this nonaqueous electrolyte secondary battery is characterized by such features that the lithium containing metal oxide is a composite oxide including spinel group lithium and manganese that is expressed by a general formula, Li[Lix Mn2-x ]O4 , where the value x is in the range of 0<=x<=0.18 and the content of sulfur contained in the composite oxide is not more than 4000 ppm. |
