| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery having high capacity and a storage characteristic. SOLUTION: This nonaqueous secondary battery has a positive electrode, a negative electrode, and nonaqueous electrolyte using lithium complex oxide as a positive active material. A positive mixture and/or a negative mixture contains an ester compound or ether compound having a carbon hydride chain with 8 or more carbons, and the nonaqueous secondary battery has either one of a peak between 168 to 170 eV due to sulfur, a peak between 291 to 295 eV due to carbon, and a peak between 399 to 401 eV due to nitrogen in the XPS analysis of the surface of the positive electrode. An atomic ratio of each element on the surface of the positive electrode determined by each peak is 1% or more for sulfur, 3% or more for carbon, and 0.3% or more for nitrogen. The battery further has a peak between 135 to 138 eV due to phosphorus and a peak between 685 to 689 eV due to fluorine, and is preferably charged at 4.3 V or more positive electrode voltage with lithium as the reference. |
