| abstract |
An active material having a high capacity and excellent charge / discharge cycle durability at a high potential is provided. An active material having a layered structure and represented by the following composition formula (1). Li y Ni a Co b Mn c M d O x F z1 P z2 (1) [In the above formula (1), the element M is at least one element selected from the group consisting of Al, Si, Zr, Ti, Fe, Mg, Nb, Ba and V, and 1.9 ≦ (a + b + c + d + y) ≦ 2.1, 1.0 ≦ y ≦ 1.3, 0 <a ≦ 0.3, 0 ≦ b ≦ 0.25, 0.3 ≦ c ≦ 0.7, 0 ≦ d ≦ 0.1, 0. 07 ≦ z1 ≦ 0.15, 0.01 ≦ z2 ≦ 0.1, 1.9 ≦ (x + z1) ≦ 2.1. ] [Selection] Figure 1 |