Inhibition of Polysulfides Dissolution and Shuttling By Solid Electrolyte and Macro-Structural Cathode for Lithium-Sulfur Batteries

Lithium-sulfur batteries possess high theoretical capacity of 1672 mAh/g. However, polysulfides dissolution and shuttling will cause loss of sulfur active materials, leading to fast capacity decay of batteries. Here, a few methods for locking sulfur by solid electrolyte and macro-structural cathode are introduced. The all-solid-state lithium-sulfur batteries can deliver the discharge capacity of 601 mAh/g at 4 C and 80 ^oC. Even over 1000 cycles, stable discharge capacities with an average capacity loss of 0.31 mAh/g per cycle are obtained. Mechanisms for such enhancement are investigated by cyclic voltammetry, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and thermo-gravimetric analysis techniques. Studies show that polysulfides dissolution and shuttling are obviously inhibited by this system. Such all-solid-state lithium-sulfur batteries are promising power sources for electric vehicles and energy storage stations.Lithium-sulfur batteries possess high theoretical capacity of 1672 mAh/g. However, polysulfides dissolution and shuttling will cause loss of sulfur active materials, leading to fast capacity decay of batteries. Here, a few methods for locking sulfur by solid electrolyte and macro-structural cathode are introduced. The all-solid-state lithium-sulfur batteries can deliver the discharge capacity of 601 mAh/g at 4 C and 80 ^oC. Even over 1000 cycles, stable discharge capacities with an average capacity loss of 0.31 mAh/g per cycle are obtained. Mechanisms for such enhancement are investigated by cyclic voltammetry, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and thermo-gravimetric analysis techniques. Studies show that polysulfides dissolution and shuttling are obviously inhibited by this system. Such all-solid-state lithium-sulfur batteries are promising power sources for electric vehicles and energy storage stations.