Recent progress in sulfide-based solid electrolytes for Li-ion batteries

Sulfide-based ionic conductors are one of most attractive solid electrolyte candidates for all-solid-state batteries. In this review, recent progress of sulfide-based solid electrolytes is described from point of view of structure. In particular, lithium thio-phosphates such as Li7P3S11, Li10GeP2S12 and Li11Si2PS12 etc. exhibit extremely high ionic conductivity of over 10(-2) S cm(-1) at room temperature, even higher than those of commercial organic carbonate electrolytes. The relationship between structure and unprecedented high ionic conductivity is delineated; some potential drawbacks of these electrolytes are also outlined. (C) 2016 Elsevier B.V. All rights reserved.