| 摘要 |
PROBLEM TO BE SOLVED: To realize a nonaqueous electrolyte secondary battery with a high capacity and a high energy density, which prevents declines in a discharge capacity and a discharge voltage of a secondary battery even under high voltage storage.SOLUTION: An embodiment utilizes a cathode active material comprising lithium transition metal composite oxide particles whose average composition is represented by the general formula LiCoBiWMgAlMO(M is at least one element selected from the group consisting of Zr and Ti, and 0.9≤a≤1.02, 0<x≤0.01, 0<y≤0.01, 0≤z≤0.03, 0≤w≤0.03, 0≤v≤0.01, and 0<x+y+z+w+v≤0.06 are satisfied). |
