Positive electrode active material and battery using positive electrode active material

A battery comprising:

• a positive electrode containing a positive-electrode active material;
• a negative electrode;
• and
• an electrolyte,
• wherein the positive-electrode active material comprising a compound represented by a composition formula:
• LixMeyOαXβ, where:
• Me denotes one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er;
• X denotes two or more elements selected from the group consisting of F, Cl, Br, I, N, and S;
• x, y, α, and β satisfy
• 0.75≤x≤2.25,
• 0.75≤y≤1.50,
• 1≤α<3, and
• 0<β≤2, respectively;
• and
• α and β further satisfy 2.0≤α/β≤5.0,
• wherein a crystal structure of the compound belongs to a space group Fm-3m.

A positive-electrode active material comprising a compound represented by a composition formula:

• LixMeyOαXβ, where:
• Me denotes one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er;
• X denotes two or more elements selected from the group consisting of F, Cl, Br, I, N, and S;
• x, y, α, and β satisfy
• 0.75≤x≤2.25,
• 0.75≤y≤1.50,
• 1≤α<3, and
• 0<β≤2, respectively;
• and
• x, y, α, and β further satisfy 0.67≤(x+y)/(α+β)≤0.95,
• wherein a crystal structure of the compound belongs to a space group Fm-3m.