| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material with a cycle life characteristic superior in charging/discharging and a nonaqueous electrolyte secondary battery using it. SOLUTION: This positive electrode active material is represented by the expression Li1+xMn2-x-y-zAyBzO4, and this nonaqueous electrolyte secondary battery uses it. In the expression A is at least one element selected from Co, Ni, Fe and Cr, B is at least one element selected from Mg and Ca and x, y and z are set in the respective ranges of 0<=X<=0.09, 0.01<=y<=0.3, 0.01<=z<=0.3. |
