Lithium–sulfur (Li–S) batteries suffer from poor‐cycle stability and low Coulombic efficiency, which are mainly caused by the intrinsic polysulfides shuttle, resulting from not only concentration gradient diffusion but also slow conversion kinetics of polysulfides. Herein, nitrogen‐doped carbon‐coated cobalt nickel selenide (Co‐NiSe₂@NC) with hollow structures is presented which can simultaneously accommodate the volume expansion of sulfur to maintain the integrity of the electrode, trap the polysulfides, and catalyze the conversion between lithium sulfide and lithium polysulfides to inhibit the polysulfides shuttle. When used to host 70 wt% sulfur, the resulted Co‐NiSe₂@NC‐S composites electrode delivers a high initial discharge capacity of 930.4 mAh g⁻¹ at 0.5 C, and after 200 cycles, a reversible discharge capacity of 544.6 mAh g⁻¹ can still be maintained.

中文翻译：

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Co-NiSe2 @ N掺杂碳空心结构的合理设计可增强Li-S电池性能

锂硫电池的循环稳定性差，库伦效率低，这主要是由于固有的多硫化物往复运动引起的，这不仅是由于浓度梯度扩散引起的，而且还由于多硫化物的转换动力学较慢所致。本文介绍了具有中空结构的氮掺杂碳包覆的硒化镍钴镍（Co-NiSe ₂ @NC），它可以同时容纳硫的体积膨胀，以保持电极的完整性，捕获多硫化物，并催化之间的转化。硫化锂和多硫化锂可抑制多硫化物的穿梭。当用于容纳70 wt％的硫时，所得的Co-NiSe ₂ @ NC-S复合电极可提供930.4 mAh g ^-1的高初始放电容量在0.5 C下进行200次循环后，仍可保持544.6 mAh g ^-1的可逆放电容量。