| abstract |
One aspect of the present invention is a positive active material (I) containing an oxide represented by the following formula (1). In the above 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 the following formulas (a) to (d): [Li 2 · 2z M 2x A 2y ] O (1) 0 < x < 1 0 < y < 1 x + y ≤ z < 1 0.2 < x / ( x + y ) |