| 摘要 |
A need exists in the prior art for a battery having a high capacity retention rate. The present invention provides a positive electrode active material comprising: a compound that is represented by the compositional formula (1) indicated below and that has a crystal structure belonging to the space group FM3-M; and a lithium ion derivative. Formula (1): LixMeyOαFβ. In formula (1), Me is one or more elements selected from the group consisting of Mn, Co, Ni, Fe, Al, B, Ce, Si, Zr, Nb, Pr, Ti, W, Ge, Mo, Sn, Bi, Cu, Mg, Ca, Ba, Sr, Y, Zn, Ga, Er, La, Sm, Yb, V, and Cr, and the conditions 1.7 ≤ x ≤ 2.2, 0.8 ≤ y ≤ 1.3, 1 ≤ α ≤ 2.5, and 0.5 ≤ β ≤ 2 are satisfied. |
