Perovskite material, method of preparing the same, and secondary battery including the perovskite material

A composite perovskite material represented by Formula 3, and having a ratio of a peak intensity at a diffraction angle 2θ of 46.5°±2.5° to a peak intensity at a diffraction angle 2θ of 32.5°±2.5° of less than 1:

• LixAyMzO3-δ Formula 3
• wherein, in Formula 3, 0.1≤x≤1, 0<y≤1, 0<x+y<1, 0<z≤1.5, and 0≤δ≤1,
• A is H, Na, K, Rb, Cs, Sr, Ba, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, or a combination thereof, and
• M is Ni, Pd, Pb, Fe, Ir, Co, Rh, Mn, Cr, Ru, Re, Sn, V, Ge, W, Mo, Hf, U, Th, Bi, Li, H, Na, K, Rb, Cs, Ba, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Mg, Al, Si, Sc, Zn, Ga, Ag, Cd, In, Sb, Pt, Au, or a combination thereof.

A perovskite material represented by Formula 1:

• LixAyMzO3-δ Formula 1
• wherein, in Formula 1, 0.1≤x≤1, 0<y≤1, 0<x+y<1, 0<z≤1.5, and 0≤δ≤1,
• A is La, and
• M is Ni, Pd, Pb, Fe, Ir, Co, Rh, Mn, Cr, Ru, Re, Sn, V, Ge, W, Mo, Hf, U, Th, Bi, Li, H, Na, K, Rb, Cs, Ba, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Mg, Al, Si, Sc, Zn, Ga, Ag, Cd, In, Sb, Pt, Au, or a combination thereof,
• wherein the perovskite material has a diffraction peak at a diffraction angle 2θ of 23.0°±2.5°, when analyzed by an X-ray diffraction using CuKα radiation.