| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous secondary cell which can be used immediate ly, without going through charging step, after preparation of a cell. SOLUTION: Li1-xMO2 (0.1<x<0.5, M is at least one element selected from Co Ni) which is difficult to chemically remove Ni portion from LiMO2 (where M is at least one element selected from Co Ni) having an average diameter (D50) of 3.0-10.0 μm is used as a positive electrode active material. |
