Lithium sulfide powder for solid electrolyte and preparation method of lithium sulfide powder

The invention discloses lithium sulfide powder for a solid electrolyte and a preparation method of the lithium sulfide powder. In the lithium sulfide powder, the oxygen content is less than or equal to 1wt%, the halogen content is 0.1-10wt%, the total content of lithium, sulfur and halogen elements is more than or equal to 98wt%, and the BET specific surface area is 1-20m < 2 >/g. By adding ammonium halide in the preparation process of the lithium sulfide powder, the oxygen element in the lithium sulfide is converted into halogen, so that the content of the oxygen element in the lithium sulfide is greatly reduced, the specific surface area value of the lithium sulfide powder is increased, and the lithium sulfide powder has a relatively high conversion rate when being used for preparing the solid electrolyte Li < 6-x > PS < 5-x > X < 1 + x >; and the ionic conductivity performance is obviously superior to that of a Li6-xPS5-xX1 + x material synthesized by conventional lithium sulfide. 本发明公开了一种固态电解质用硫化锂粉体及其制备方法