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 Li7P3S11 solid electrolyte has serious interface issues between electrode and solid electrolyte. The reaction of lithium metal and Li7P3S11 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 Li7P3S11 with BN doping for the all-solid-state lithium sulfur battery. The BN nanoflakes could partially isolate the Li7P3S11 solid electrolyte and lithium metal, thus improving the interfacial compatibility of electrode and electrolyte. With BN doped Li7P3S11 used as solid electrolyte, the all-solid-state Li/S battery exhibits an enhanced electrochemical performance with better cycling stability and higher Coulombic efficiency.