Solid electrolyte and preparation method and application thereof

The invention provides a solid electrolyte and a preparation method and application thereof. The preparation method of the solid electrolyte comprises the following steps: S1, taking metal lithium, hydrogen sulfide gas and a solvent for chemical reaction to obtain a lithium sulfide solution; s2, adding the precursor into a lithium sulfide solution for heat treatment to obtain a solid electrolyte; wherein the solvent is a C1-C5 alcohol solvent. Compared with a solid electrolyte prepared by a conventional method, the solid electrolyte prepared by the method has the advantages that the purity is higher, the content of lithium sulfide impurities is obviously reduced, the ionic conductivity is greatly improved, and the solid electrolyte shows better rate capability and cycle performance when being applied to a lithium ion battery. 本发明提供了一种固态电解质及其制备方法和应用。该固态电解质的制备方法包括以下步骤：步骤S1，取金属锂、硫化氢气体以及溶剂进行化学反应，得到硫化锂溶液；步骤S2，将前驱体加入至硫化锂溶液中进行热处理，得到固态电解质；其中，溶剂为C1～C5的醇类溶剂。采用本发明制备的固态电解质相比于常规方法制备的固态电解质，其纯度更高，硫化锂杂质含量明显降低，离子电导率大幅度提升，应用于锂