Lithium–sulfur (Li–S) batteries, based on the redox reaction between elemental sulfur and lithium metal, have attracted great interest because of their inherently high theoretical energy density. However, the severe polysulfide shuttle effect and sluggish reaction kinetics in sulfur cathodes, as well as dendrite growth in lithium‐metal anodes are great obstacles for their practical application. Herein, a two‐in‐one approach with superhierarchical cobalt‐embedded nitrogen‐doped porous carbon nanosheets (Co/N‐PCNSs) as stable hosts for both elemental sulfur and metallic lithium to improve their performance simultaneously is reported. Experimental and theoretical results reveal that stable Co nanoparticles, elaborately encapsulated by N‐doped graphitic carbon, can work synergistically with N heteroatoms to reserve the soluble polysulfides and promote the redox reaction kinetics of sulfur cathodes. Moreover, the high‐surface‐area pore structure and the Co‐enhanced lithiophilic N heteroatoms in Co/N‐PCNSs can regulate metallic lithium plating and successfully suppress lithium dendrite growth in the anodes. As a result, a full lithium–sulfur cell constructed with Co/N‐PCNSs as two‐in‐one hosts demonstrates excellent capacity retention with stable Coulombic efficiency.

中文翻译：

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超高性能钴嵌入氮掺杂多孔碳纳米片作为高性能锂硫电池的二合一主体

基于元素硫和锂金属之间的氧化还原反应的锂硫（Li–S）电池由于其固有的高理论能量密度而引起了人们的极大兴趣。但是，硫阴极中严重的多硫化物穿梭效应和缓慢的反应动力学，以及锂金属阳极中枝晶的生长，对它们的实际应用构成了很大的障碍。本文报道了一种二合一的方法，该方法将超分级钴嵌入的氮掺杂多孔碳纳米片（Co / N-PCNSs）作为元素硫和金属锂的稳定基质，以同时提高其性能。实验和理论结果表明，由N掺杂石墨碳精心包封的稳定Co纳米颗粒，可以与N个杂原子协同工作，以保留可溶性多硫化物并促进硫阴极的氧化还原反应动力学。此外，Co / N-PCNSs中的高表面积孔结构和增强的Lithiophilic N杂原子可以调节金属锂镀层并成功抑制阳极中锂枝晶的生长。结果，以Co / N-PCNSs为二合一宿主构建的完整锂硫电池显示出出色的容量保持能力和稳定的库仑效率。