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A high tenacity electrode by assembly of a soft sorbent and hard skeleton for lithium-sulfur batteries

Abstract

Lithium-sulfur (Li-S) batteries have great potential for high energy applications owing to their high theoretical energy density. However, the poor cycling life and low capacity retention are main challenges, which caused by the irreversible loss of active reagent due to the shuttle effect of polysulfides and the structure pulverization of cathode materials. To date, the soluble polysulfides have been efficiently trapped by chemical absorption of functionalized carbon materials, however, the large volume expansion of sulfur during lithiation/delithiation processes as a critical aspect has not been considered. Herein, we report that the volume expansion can be accommodated by fabricating a composite structure with a soft (nitrogen-doped graphene) and a hard (silicon carbide whisker) materials. Due to trapping soluble polysulfides by soft nitrogen-doped graphene and building a strong structure with hard silicon carbide whisker, it delivered a high specific capacity of 1288 mAh g-1 at a current density of 335 mA g-1 and exhibited a capacity retention of more than 80% after 150 cycles.

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Publication details

The article was received on 10 Aug 2017, accepted on 04 Sep 2017 and first published on 04 Sep 2017


Article type: Communication
DOI: 10.1039/C7TA07063B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A high tenacity electrode by assembly of a soft sorbent and hard skeleton for lithium-sulfur batteries

    X. tang, Z. Sun, J. Liang, J. Zhao, H. Cheng, S. Zhuo and F. LI, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07063B

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