| abstract |
Provided is a means capable of suppressing elution of transition metals, particularly manganese, in a positive electrode active material for a non-aqueous electrolyte secondary battery. According to the present invention, composition formula (1): Here, X is at least one of Ti, Zr and Nb, 0 ≦ e ≦ 0.5, a + b + c + d + e = 1.5, 0.1 ≦ d ≦ 0.4, 1.1 ≦ [a + b + c + e] ≦ 1.4, z is a solid solution active material represented by an oxygen number satisfying the valence, an alumina layer is present on the surface of the solid solution active material, and an interface between the solid solution active material and the alumina layer. Provided is a positive electrode active material for a non-aqueous electrolyte secondary battery having a region in which an Al element is present on the solid solution active material side. [Selection] Figure 17 |