▎ 摘　　要

Lithium-sulfur batteries (LSBs) regarded as the most potential energy storage system, are severely restricted by sluggish conversion kinetics and shuttle effect of lithium polysulfide (UPS) for the practical application. In terms of these limitations, herein an in-situ grown WS2 nanosheets embedded on N-doped graphene (WS2@NG) composite configuration is presented with remarkably catalytic effect for S hosts. Density functional theory (DFT) calculations and electrochemical testing results synergistically indicate that the WS2@NG characterized by strongly interaction with LiPS species contributes to an effective inhabitation towards shuttle effect. In addition, the significant charge transfers between WS2 and LiPS interface can reduce the energy barrier for the conversion between S and Li2S. Benefitting from these merits, the LSBs based on WS2@NG/S cathodes show remarkable rate performance with a capacity of 683 mAh g(-1) at 5 C and impressive cyclic durability with a retained displayed capacity of 556 mAh g(-1) after 500 cycles at 1 C. Even with a sulfur loading of 6.6 mg cm(-2), the WS2 @NG/S based LSBs can still deliver a high areal capacity of 8.9 mAh cm(-2). These results demonstrate that the WS2@NG can act as multifunctional LiPS mediators to construct high-performance LSBs system.