Metal sulfide MoS2 as efficient polysulfide adsorber for high electrochemical performance lithium-sulfur batteries

The high specific capacity and energy density of lithium-sulfur batteries have attracted many researchers all over the world. However, the poor cycling stability hinders the rapid application of lithium-sulfur batteries. The fast capacity fading is mainly attributed to the shuttle effect caused by the polysulfide migration from the cathode side to the anode side. In the past decades, great efforts have been made to improve the electrochemical performance of lithium-sulfur batteries. In this work, we design spherical MoS2@S composites as cathode materials for lithium-sulfur batteries. Due to the strong chemical affinity between the polar MoS2 and polysulfide, the shuttle effect can be efficiently inhibited during the discharging and charging process. As a result, the as-prepared MoS2@S composites display high specific capacity and superior cycling stability.