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

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Abstract

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.

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

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Supplementary files

Article information


Submitted
23 Dec 2019
Accepted
22 Jan 2020
First published
30 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Communication

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

J. Sun, Y. Liu, H. Du, S. He, L. Liu, Z. Fu, L. Xie, W. Ai and W. Huang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13999K

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