| Summary: | Lithium–sulfur batteries have emerged as one of the promising next-generation energy storage devices. However, the dissolution and shuttling of polysulfides in the electrolyte leads to a rapid decrease in capacity, severe self-discharge, and poor high-temperature performance. Here, we demonstrate the design and preparation of a Mo<sub>2</sub>C nanoparticle-embedded carbon nanosheet matrix material (Mo<sub>2</sub>C/C) and its application in lithium–sulfur battery separator modification. As a polar catalyst, Mo<sub>2</sub>C/C can effectively adsorb and promote the reversible conversion of lithium polysulfides, suppress the shuttle effect, and improve the electrochemical performance of the battery. The lithium–sulfur battery with the Mo<sub>2</sub>C/C =-modified separator showed a good rate of performance with high specific capacities of 1470 and 799 mAh g<sup>−1</sup> at 0.1 and 2 C, respectively. In addition, the long-cycle performance of only 0.09% decay per cycle for 400 cycles and the stable cycling under high sulfur loading indicate that the Mo<sub>2</sub>C/C-modified separator holds great promise for the development of high-energy-density lithium–sulfur batteries.
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