Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China.
Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo, 315201, China.
Dalton Trans. 2023 Apr 11;52(15):4700-4707. doi: 10.1039/d3dt00288h.
Lithium-sulfur (Li-S) batteries have attracted great research attention because of their high energy density and low cost. However, shuttling effects of polysulfides and insulation from elemental sulfur hinder their practical application. Herein, we report hollow carbon nanofibers filled with carbon nanotubes (denoted as HCNF/CNT) as host materials for sulfur to mitigate the shuttling behavior and improve the kinetics of insulative sulfur. The as-prepared HCNF/CNT with nano-conductive domains in the hollow carbon nanofibers enables high loading and efficient utilization of sulfur. Owing to their unique structural superiority, the sulfur-encapsulated HCNF/CNT cathode materials for Li-S batteries deliver excellent electrochemical performance, including high specific capacity of 1156 mA h g at 0.2 C, good rate performance and cycling stability with a capacity retention of 77.2% after 200 cycles at 2 C. Such a unique structure can provide inspiration for the rational structural design of carbon materials as hosts for high performance Li-S batteries.
锂硫（Li-S）电池因其高能量密度和低成本而引起了广泛的研究关注。然而，多硫化物的穿梭效应和元素硫的绝缘性阻碍了其实际应用。在此，我们报告了一种空心碳纳米纤维填充碳纳米管（表示为 HCNF/CNT）作为硫的主体材料，以减轻穿梭行为并改善不导电硫的动力学。所制备的 HCNF/CNT 具有空心碳纳米纤维中的纳米导电畴，可实现高负载和有效利用硫。由于其独特的结构优势，用于 Li-S 电池的封装硫的 HCNF/CNT 阴极材料表现出优异的电化学性能，包括在 0.2 C 时为 1156 mA h g 的高比容量、良好的倍率性能和循环稳定性，在 2 C 时 200 次循环后容量保持率为 77.2%。这种独特的结构为作为高性能 Li-S 电池主体的碳材料的合理结构设计提供了灵感。
