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Insight into the positive effect of porous hierarchy in S/C cathodes on the electrochemical performance of Li–S batteries

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Abstract

Hierarchically porous carbon-supported sulfur material is widely used as a cathode for Li–S batteries because its large surface area and rich porous system provide high sulfur loading, resulting in high specific capacity with stable charge/discharge cycling performance. However, limited attention has been paid to whether the structure of hierarchical porous system affects the final electrochemical performance of Li–S/C batteries. Herein, we present hierarchically structured carbon (WSAC) with varied amounts of mesopores and micropores as a sulfur container for Li–S batteries. It is found that the relationship between electrochemical performance and percentage of microporous volume obeys a volcano distribution, which indicates that the volume percentage of microporous in the meso-microporous structure could be suitably tuned to achieve the desired electrochemical performance. Such S/hierarchically meso-microporous carbon (i.e., WSAC-8) with moderate microporous volume percentage (68.3%) shows high initial specific capacity (1375 mA h g−1) and stable charge/discharge performance (942.6 mA h g−1 after 200 cycles at 0.5C). In particular, WSAC-8 also presented superior capacity behavior at high rate capability, with final capacity as high as 800.1 and 758.7 mA h g−1 for 1C and 2C, respectively.

Graphical abstract: Insight into the positive effect of porous hierarchy in S/C cathodes on the electrochemical performance of Li–S batteries

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Publication details

The article was received on 22 Apr 2018, accepted on 29 May 2018 and first published on 30 May 2018


Article type: Paper
DOI: 10.1039/C8NR03290D
Citation: Nanoscale, 2018, Advance Article
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    Insight into the positive effect of porous hierarchy in S/C cathodes on the electrochemical performance of Li–S batteries

    P. Wu, L. Chen, S. Xiao, S. Yu, Z. Wang, Y. Li and B. Su, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR03290D

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