Solid electrolyte composition, solid electrolyte material, and method for producing solid electrolyte composition

The solid electrolyte composition of the present disclosure contains: a solid electrolyte containing Li, M1, O, and X1; a halide containing M2 and X2; and an organic solvent. M1 is at least one selected from the group consisting of Nb and Ta. M2 is at least one selected from the group consisting of Nb and Ta. X1 is at least one selected from the group consisting of F, Cl, Br, and I. X2 is at least one selected from the group consisting of F, Cl, Br, and I. 本公开的固体电解质组合物含有：含有Li、M1、O和X1的固体电解质；含有M2和X2的卤化物；和有机溶剂。M1为选自由Nb和Ta组成的组中的至少一个。M2为选自由Nb和Ta组成的组中的至少一个。X1为选自由F、Cl、Br和I组成的组中的至少一个。X2为选自由F、Cl、Br和I组成的组中的至少一个。