Solid electrolyte material, lithium battery, and method of producing solid electrolyte material

A method of producing a solid electrolyte material comprising steps of:

• preparing a raw material, in which the raw material is made of Li, La, Ti, M1 (M1 being at least one selected from the group consisting of Sr, Na, Nd, Pr, Sm, Gd, Dy, Y, Eu, Tb, and Ba), and M2 (M2 being at least one selected from the group consisting of Mg, W, Mn, Al, Ge, Ru, Nb, Ta, Co, Zr, Hf, Fe, Cr, and Ga);
• and
• forming a thin film, in which a solid electrolyte material is formed using the raw material to a substrate by a reactive deposition method using oxygen, and the solid electrolyte material is represented by a general formula:
• Lix(La1-aM1a)y(Ti1-bM2b)zOδ, in which “x”, “y”, and “z” satisfy relations of x+y+z=1, 0.850≦x/(x+y+z)≦0.930, and 0.087≦y/(y+z)≦0.115;
• “a” is 0≦a≦1;
• “b” is 0≦b≦1;
• and “δ” is 0.8≦δ≦1.2.