Catalytic materials are considered pivotal in addressing the sluggish kinetics and shuttle effect in lithium–sulfur batteries (LSBs). However, effectively harnessing the utilization rate of active sites within catalytic materials remains a pivotal challenge. In this study, a novel conductive nitrogen-doped graphene-loaded tungsten oxynitride nanoparticle (WNO/NG) with abundant active sites is prepared through a polymer-assisted templating method for serving as a sulfur host. Electrochemical analysis coupled with in situ XRD confirm the dual-directional electrocatalytic behavior of WNO/NG for accelerating the conversion of lithium polysulfide (LiPSs). Theoretical calculations demonstrate that the intrinsic mechanism underlying the performance enhancement is attributed to the high inherent conductivity of WNO/NG and the efficient interface charge transfer with LiPSs. The assembled 500 mAh pouch cell delivers a 97% capacity retention after 25 cycles. This strategy provides valuable insights for designing catalytic materials with abundant activity sites and sheds light on the mechanisms of catalytic enhancement in Li–S chemistry.

中文翻译：

---

氮掺杂石墨烯负载的氮氧化物纳米颗粒作为先进锂硫电池的高效双向多硫化物转换器


催化材料被认为是解决锂硫电池 （LSB） 中动力学缓慢和穿梭效应的关键。然而，有效利用催化材料中活性位点的利用率仍然是一个关键挑战。在本研究中，通过聚合物辅助模板方法制备了一种具有丰富活性位点的新型导电氮掺杂石墨烯负载氧氮化钨纳米颗粒 （WNO/NG），用作硫宿主。电化学分析与原位 XRD 相结合，证实了 WNO/NG 在加速多硫化锂 （LiPSs） 转化方面的双向电催化行为。理论计算表明，性能增强的内在机制归因于 WNO/NG 的高固有电导率和 LiPSs 的高效界面电荷转移。组装好的 500 mAh 软包电池在 25 次循环后可提供 97% 的容量保持。该策略为设计具有丰富活性位点的催化材料提供了有价值的见解，并阐明了 Li-S 化学中催化增强的机制。