Assembling All‐Solid‐State Lithium–Sulfur Batteries with Li3N‐Protected Anodes

Abstract The construction of all‐solid‐state batteries is now easier after the successful synthesis of sulfur‐based solid electrolytes with extremely high ionic conductivities. Utilizing lithium metal as the anode in these batteries requires a protective solid electrolyte layer to prevent corrosion due to the highly reactive nature of lithium. Li 3 N coating on lithium metal is a promising way of preventing the degradation of the electrolyte during charge and discharge. In this study, utilization of a Li 3 N‐coated lithium anode and Li 7 P 3 S 11 solid electrolyte are reported, where a quaternary reduced graphene oxide (rGO)/S/carbon black/Li 7 P 3 S 11 composite is used as cathode in the assembled cell. Our results indicate that protecting the Li metal with a Li 3 N coating does not affect the electrochemical characteristics of the cell and extends the cycle life of the battery. A cell assembled with a protective layer was shown to having 306 mAh g −1 capacity after 120 cycles at 160 mAh g −1 current density, whereas a cell without protective layer had a capacity of 260 mAh g −1 .