Preparation of lithium ion conducting glasses and glass–ceramics for all-solid-state batteries

Highly lithium ion conducting glasses and glass–ceramics were prepared by a mechanical milling technique in the Li2S-based sulfide and oxysulfide systems. The Li2S–P2S5 glass–ceramics showed ionic conductivity as high as 3.2 × 10−3 S cm−1 at room temperature. All-solid-state batteries using these sulfide-based materials as a solid electrolyte showed excellent charge–discharge performance with high capacity and high cycleability. The cells with the combination of the SnS–P2S5 glassy electrode and the Li2S–P2S5 glass–ceramic electrolyte worked as a secondary battery, which was a first step of glassy monolithic cells with a common glass network.