Promoting Li 2 S Nucleation/Dissolution Kinetics via Multiple Active Sites over TiVCrMoC 3 T x Interface.

Lithium-sulfur batteries (LSBs) are still limited by some issues such as polysulfides shuttle and lithium dendrites. Recently, the concept "high-entropy" has been considered as the research hotspot and international frontier. Herein, a high entropy MXene (TiVCrMoC 3 T x , HE-MXene) doped graphene is designed as the modified coating on commercial separators for LSBs. The HE-MXene affords multiple metal active sites, fast Li + diffusion rate, and efficient adsorption toward polysulfide intermediates. Furthermore, strong lithophilic property is favorable for uniform Li + deposition. The combination of in situ characterizations confirms TiVCrMoC 3 T x effectively promotes the Li 2 S nucleation/dissolution kinetics, reduces the Li + diffusion barrier, and exhibits favorable lithium uniform deposition behavior. This TiVCrMoC 3 T x /G@PP provides a high-capacity retention rate after 1000 cycles at 1 C and 2 C, with a capacity decay rate of merely 0.021% and 0.022% per cycle. Surprisingly, the cell operates at a low potential of 48 mV while maintaining at 5 mA cm -2 /5 mAh cm -2 for 4000 h. Furthermore, it still maintains a high-capacity retention rate under a high sulfur loading of 4.8/6.4 mg cm -2 and a low E/S ratio of 8.6/7.5 µg mL -1 . This work reveals a technical roadmap for simultaneously addressing the cathode and anode challenge, thus achieving potential commercially viable LSBs.