Characterization of Li 2S–P 2S 5 glass-ceramics as a solid electrolyte for lithium secondary batteries

Abstract

Glass-ceramic solid electrolytes were prepared by crystallization of the mechanically milled 80Li 2S·20P 2S 5 glass and their electrical and electrochemical properties were examined. The glass-ceramics exhibited favorable features as a solid electrolyte for lithium secondary batteries such as high ambient temperature conductivity of 7.2×10 −4 S cm −1, unity of lithium transport number, wide electrochemical window, and high stability against lithium metal. All-solid-state cells In/80Li 2S·20P 2S 5 glass-ceramic/LiCoO 2 worked as lithium secondary batteries at room temperature and maintained large discharge capacity of about 100 mA h g −1 up to the 200th cycle with the charge–discharge efficiency of 100%.