Recent achievements on sulfide-type solid electrolytes: crystal structures and electrochemical performance

The all-solid-state lithium batteries using solid electrolytes are considered to be the new generation of devices for energy storage, which might be a key solution for power electric and hybrid electric vehicles in the future. This review focuses on the crystal structures and electrochemical properties of sulfide solid electrolytes. They are classified to several subgroups according to their chemical compositions, namely thiophosphates, halide thiophosphates, sulfide without phosphorus, and glassy sulfides electrolytes, which might be potential solid electrolytes in lithium batteries and may replace the currently used polymeric electrolytes for LIBs. Through discussion, this review provides an insight into future promising sulfide electrolytes.