Molecularly designed N, S co-doped carbon nanowalls decorated on graphene as a highly efficient sulfur reservoir for Li-S batteries: A supramolecular strategy

Jinmeng Sun, Yuhang Liu, Hongfang Du, Song He, Lei Liu, Zhenqian Fu, Linghai Xie, Wei Ai, Wei Huang

科研成果: 期刊稿件文章同行评审

48 引用 (Scopus)

摘要

Sulfur is among the most promising cathodes for next-generation high energy storage systems. However, its practical applications have been hindered by its insulating nature (i.e., S and its discharge product Li2S), substantial volume changes, and detrimental shuttle effect (polysulfide intermediates). Nanostructured hosts with high conductivity and strong polysulfide entrapment are the prerequisites for high-capacity and long-cycle life Li-S batteries. Here, we report a carbonaceous host based on N, S co-doped carbon nanowall decorated graphene (NSCNW-G) via a supramolecular strategy, which simultaneously achieves abundant voids for sulfur species accommodation and fast redox kinetics of polysulfides. As a result, NSCNW-G/S delivers a high capacity of 1246 mA h g-1 at 0.02C, superb cycling stability with an ultralow decay rate of 0.021% per cycle for as long as 800 cycles at 0.5C, and a stable coulombic efficiency of up to 98% with a high mass loading of approximately 80 wt%. Even with a high areal loading of 3.2 mg cm-2, a capacity of 510 mA h g-1 is still retained after 300 cycles at 0.5C. Our present supramolecular strategy demonstrates a feasible pathway to the rational design of advanced carbonaceous materials for Li-S batteries and other electrochemical applications.

源语言英语
页(从-至)5449-5457
页数9
期刊Journal of Materials Chemistry A
8
11
DOI
出版状态已出版 - 21 3月 2020

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