| abstract |
Conventionally, there has been a need to achieve a battery with high energy density. This battery comprises a positive electrode including a positive electrode active material, a negative electrode, and a solid electrolyte. The positive electrode active material includes a compound represented by the following compositional formula (1) and having a crystal structure that belongs to space group FM3-M. Formula (1) Li x Me y O α F β In the formula, Me is at least one type of element 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 following conditions are satisfied: 1.7 ≤ x ≤2.2; 0.8 ≤y ≤1.3; 1 ≤α ≤ 2.5; and 0.5 ≤β ≤ 2. |