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Issue 36, 2017
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A 3D conductive network with high loading Li2S@C for high performance lithium–sulfur batteries

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Abstract

Construction of novel cathodes with a high loading of active material and excellent confinement effect for polysulfides is indispensable and vital for the realization of high-energy and commercially viable lithium–sulfur batteries. In this study, we demonstrated a facile strategy for the fabrication of an integrated lithium sulfide (Li2S) cathode by incorporating lithium sulfide (Li2S)/carbon black (CB) into the carbon felt (CF) with a 3D conductive network and further modifying it by an outer amorphous carbon shell (CF–CB–Li2S@C) via facile liquid solution-evaporation plus chemical vapor deposition technologies. The CF with abundant macroporous channels provides enough reaction sites to load and stabilize a high amount of active materials. The inter-connected conductive network and efficient carbon shell not only provide efficient electron transport and guarantee high active material utilization, but also form a durable protective shield for suppressing polysulfide dissolution. As a result, the CF–CB–Li2S@C cathode with a high loading of 7 mg cm−2 demonstrates an initial discharge capacity of 943.7 mA h g−1 (6.60 mA h cm−2) at 0.1C. Importantly, it still maintains a capacity of 567.5 mA h g−1 (3.97 mA h cm−2) at 1C after 200 cycles, corresponding to a low fading rate of 0.12% per cycle.

Graphical abstract: A 3D conductive network with high loading Li2S@C for high performance lithium–sulfur batteries

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Publication details

The article was received on 13 Jul 2017, accepted on 21 Aug 2017 and first published on 21 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06090D
Citation: J. Mater. Chem. A, 2017,5, 19358-19363
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    A 3D conductive network with high loading Li2S@C for high performance lithium–sulfur batteries

    D. Wang, D. Xie, X. Xia, X. Zhang, W. Tang, Y. Zhong, J. Wu, X. Wang and J. Tu, J. Mater. Chem. A, 2017, 5, 19358
    DOI: 10.1039/C7TA06090D

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