Lithium-sulfur (Li-S) batteries are severely confined by the sluggish redox kinetics and serious shuttle effect, and these disadvantages cause rapid capacity decay and low sulfur utilization efficiency. We fabricate the polar MoSe₂, Mo₂C coupled with F-doped carbon fibers (FC), named as MoSe₂@FC@Mo₂C to serve as the step multi-electrocatalysts to selectively catalyze the short chain soluble lithium polysulfides (LiPSs) conversion (Li₂S₄ ↔ Li₂S) via the polar FC and the long chain LiPSs conversion (S₈ ↔ Li₂S₄) via MoSe₂ and Mo₂C. The MoSe₂@FC@Mo₂C/S cathode material delivered a high specific capacity of 1359 mAh g⁻¹ (81% of its theoretical capacity) at 0.2C and excellent cycle performance when evaluated for Li-S batteries. A high reversible capacity of 802 mAh g⁻¹ at 5C even with a lean E/S of 5 mLg⁻¹, and a high sulfur loading of 5.5 mg cm⁻² was delivered, a favorable cycle behavior at 2C over 1000 cycles (0.029% decay per cycle) was obtained, corroborating the effective LiPSs shuttling relief and high LiPSs conversion efficacy. This work propels the further practical application of Li-S batteries, especially those which are tethered by sluggish kinetics and inferior rate performance.

锂-硫（Li-S）电池受到缓慢的氧化还原动力学和严重的穿梭效应的严格限制，这些缺点导致容量快速衰减和硫利用效率低下。我们制备了极性MoSe ₂，Mo ₂ C以及掺F的碳纤维（FC），称为MoSe ₂ @ FC @ Mo ₂ C，以用作选择性催化短链可溶性多硫化锂（LiPSs）的步骤多电催化剂。 ）转化率（栗₂小号₄ ↔栗₂ S）经由极性FC和长链LIPSS转换（š ₈ ↔栗₂小号₄）经由摩西₂和Mo ₂C. MoSe ₂ @ FC @ Mo ₂ C / S正极材料在0.2C时具有1359 mAh g ^-1的高比容量（理论容量的81％），在对Li-S电池进行评估时具有出色的循环性能。即使在5 E / S的稀薄E / S为5 mLg ^{-1的情况下}，在5C时仍具有802 mAh g ^-1的高可逆容量，并且提供了5.5 mg cm ^-2的高硫负载，在2C下经过1000次循环后具有良好的循环性能（0.029获得了每个循环的衰减百分比），证实了有效的LiPS穿梭缓和和高LiPSs转换效率。这项工作推动了Li-S电池的进一步实际应用，特别是那些动力不佳和速率性能低下的电池。