| 摘要 |
An active material having high capacity and excellent charging/discharging cycle durability at high potential is provided. The active material has a layered structure and is represented by the following composition formula (1): LiyNiaCobMncMdOxFz1Pz2  (1) wherein 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, and 1.9≦̸(x+z1)≦̸2.1 are satisfied. |
