| abstract |
The present invention provides: a solid electrolyte comprising an oxysulfide-based compound represented by the chemical formula (1), thereby having excellent water stability; a preparation method therefor; and a solid-state battery having excellent manufacturing processability by using same. Li a P b M c S d O e X (1) In chemical formula (1), M is one or more selected from the group consisting of Zr, Nb, Hf, Ta, Ga, In, Ti, Pb, Bi, Ge, As, Sb, Si, B and Al, X is one selected from the group consisting of F, Cl, Br and I, 6<a≤7, 0<b<1, 0<c<1, 4<d<5 and 0<e<1. |