Boron nitride doped Li7P3S11 solid electrolyte with improved interfacial compatibility and application in all-solid-state Li/S battery

All-solid-state lithium sulfur battery is considered as one of the most promising candidates for the future application due to high theoretical energy density and enhanced safety. However, the all-solid-state lithium sulfur battery based on Li 7 P 3 S 11 solid electrolyte has serious interface issues between electrode and solid electrolyte. The reaction of lithium metal and Li 7 P 3 S 11 solid electrolyte would form a layer without lithium-ion conducting, which could impend the lithium-ion transfer and transport during cycling and causes increase of internal resistance and capacity fading. Herein, we introduce a solid electrolyte Li 7 P 3 S 11 with BN doping for the all-solid-state lithium sulfur battery. The BN nanoflakes could partially isolate the Li 7 P 3 S 11 solid electrolyte and lithium metal, thus improving the interfacial compatibility of electrode and electrolyte. With BN doped Li 7 P 3 S 11 used as solid electrolyte, the all-solid-state Li/S battery exhibits an enhanced electrochemical performance with better cycling stability and higher Coulombic efficiency.