| abstract |
In the positive electrode active material for a nonaqueous electrolyte secondary battery, means for suppressing elution of transition metals, particularly manganese, is provided. According to the present invention, the composition formula (1): [Equation 1] Wherein X is at least one species selected from the group consisting of Ti, Zr and Nb, where 0? E? 0.5, a + b + c + d + e = 1.5, 0.1? D? 0.4 and 1.1? A + b + c + e? 1.4, And an area of the interface between the solid solution active material and the alumina layer where the Al element is present on the side of the solid solution active material, A positive electrode active material is provided. |