CRYSTALLINE SOLID ELECTROLYTE AND PRODUCTION METHOD THEREFOR

摘要

Provided is a novel crystalline solid electrolyte which can be used as a dispersion medium when slurrying polar solvents such as NMP, acetone, and DMF, and for which a decrease in conductivity when the crystalline solid electrolyte is immersed in said solvents can be suppressed. Proposed is a crystalline solid electrolyte represented by Compositional Formula: Li x Si y P z S a Ha w (here, Ha includes one or two or more of Br, Cl, I, and F, and 2.4 < (x - y)/(y + z) < 3.3), in which the content of S is 55 to 73% by mass, the content of Si is 2 to 11% by mass, and the content of a Ha element is 0.02% by mass or more.