Abstract
The properties and structure of the lithium ion-conducting oxysulfide glasses in the systems Li 2S–SiS 2–Li x MO y (Li x MO y : lithium ortho-oxosalt, M=Si, P, Ge, B, Al, Ga and In) are reviewed. The Li 2S–SiS 2 glass added with small amounts of Li x MO y exhibited high glass stability against crystallization, high conductivity of 10 −3 S cm −1 at room temperature, and wide electrochemical window. Further addition of Li x MO y reduced these superior properties in any system. High-resolution solid-state NMR and X-ray photoelectron spectroscopy revealed that the silicon atoms coordinated with both bridging oxygen atoms and nonbridging sulfur atoms were mainly present in the glasses with small amounts of Li x MO y . The presence of these unique structural units brought about high conductivities and high thermal stability of these glasses. The solid state battery with the oxysulfide glass worked as a lithium secondary battery and performed excellent cycling behaviors.
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