| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material which enables the achievement of both of satisfactory cycle and high-capacity characteristics in a nonaqueous secondary battery.SOLUTION: A positive an electrode active material for a nonaqueous secondary battery comprises: active material particles of a layered structure, each having a core portion and a surface layer portion which differ in composition from each other. The active material particles have a composition expressed by the following formula (1), of which the a zeta potential isoelectric point is 5-7: LiNiMnCoMO(1). In the formula (1), M is at least one element selected from a group consisting of Mg, Al, Ti, Mo and Nb; "a", "b", "c", "d" and "e" are numbers satisfying: -0.1≤a≤0.3, 0.5≤b≤0.95, 0<c≤0.95, 0≤d≤0.6, 0≤e≤0.1, and b+c+d+e=1.SELECTED DRAWING: Figure 1A |
