A Stable Electrolyte Interface with Li3ps4@Li7p3s11 for High-Performance Solid/Liquid Li-S Battery

The solid/liquid Li-S battery shows promise in solving both the polysulfide “shuttle effect” in liquid batteries and the interfacial contact in all-solid-state batteries. However, increasing the interfacial stability of the electrolyte and the solid electrolyte remains a challenge in the solid/liquid batteries. In this work, a high ionic conductivity Li3PS4 solution is synthesized using a nano-Li2S precursor, which is then utilized to form a solid electrolyte Li3PS4@Li7P3S11 via dip-coating. The Li3PS4@Li7P3S11 can form a dense protective interface Li3PS4-DME with the DOL/DME and DME electrolyte. This interface can prevent direct contact between the solid electrolyte and the electrolytes, efficiently inhibiting further solid electrolyte decomposition. The lithium symmetric battery with the solid electrolyte Li3PS4@Li7P3S11 is cycled stably for 1000 h, at a current density of 0.38 mA cm−2 and a capacity of 1.51 mA h cm−2. The Li-S battery with the solid electrolyte Li3PS4@Li7P3S11 can cycle stably for 300 cycles at 0.2C with a capacity of 600 mA h g−1 remaining.