Mo 2 C‐Embedded Carbon Nanofibers as the Interlayer in High‐Performance Lithium‐Sulfur Batteries

Lithium-sulfur batteries (LSBs) are among the most encouraging competitors for the next-generation energy storage system, nevertheless, the shuttle effect resulted from the soluble lithium polysulfides (LiPSs) and slow chemical kinetics hinder the pragmatic application of LSBs. To address those issues, herein, a uniform three-dimensional (3D) structure constructing carbon nanofibers (CNF) with polar Mo2C nanoparticles (Mo2[email protected]) was designed and coated onto one side of pristine conventional polypropylene separator (Mo2[email protected]/PP). The Mo2[email protected] with high electrical conductivity not only chemically constrained the LiPSs by chemical trapping, but also catalyzed the conversion of LiPSs to Li2S2/Li2S. Cells with Mo2[email protected]/PP separator presented a high specific capacity of 732.9 mAh g−1; 500 mAh g−1 was kept, due to sluggish capacity decay (0.063 % per cycle), after 500 cycles. Judging from the outstanding electrochemical performance of batteries with the Mo2[email protected]/PP separator, the proposal is an enlightening strategy for the advancement high-performance LSBs.