abstract |
One embodiment of the present invention is a positive electrode active material (I) which contains an oxide represented by formula (1). In formula (1), M is Co, Fe, Cu, Mn, Ni, Cr or a combination thereof. A is a Group 13 element, a Group 14 element, P, Sb, Bi, Te or a combination thereof. x, y and z satisfy formulas (a)-(d). (1): [Li2-2zM2xA2y]O, (a): 0<x<1, (b): 0<y<1, (c): x+y≤z<1, (d) 0.2<x/(x+y). |