Li_7P_3S_(11)/poly(ethylene oxide) hybrid solid electrolytes with excellent interfacial compatibility for all-solid-state batteries

摘要

Low ionic conductivity and poor interfacial compatibility between lithium electrodes and Li7P3S11sulfide solid electrolytes are the greatest challenges for all-solid state lithium-sulfur batteries. Herein, we introduce a hybrid solid electrolyte with Li7P3S11being wrapped with polyethylene oxide-LiClO4(PEO-LiClO4). As served as conductive bridge between Li7P3S11particles, PEO-LiClO4would provide Li+transition paths between Li7P3S11particles, thus successfully improve its ionic conductivity. Moreover, the polymer layer of PEO-LiClO4can isolate lithium metal and Li7P3S11solid electrolyte, suppressing the reaction between lithium electrode and Li7P3S11electrolyte. Therefore, hybrid solid electrolyte Li7P3S11-PEO-LiClO4shows excellent interfacial compatibility with lithium foil. Lithium-sulfur battery with the hybrid electrolyte Li7P3S11-PEO-LiClO4exhibits much improved electrochemical performance with better cycling stability and higher Coulombic efficiency.