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Issue 23, 2013
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Infiltrating sulfur in hierarchical architecture MWCNT@meso C core–shell nanocomposites for lithium–sulfur batteries

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Abstract

We present hierarchical architecture MWCNT (multi-walled carbon nanotubes)@meso C core–shell nanostructures as a carbon matrix for effective trapping of sulfur/polysulfides as a cathode material for Li–S batteries. The unique structure of MWCNT@meso C core–shell nanocomposites was achieved by using a sol–gel coating method followed by nanocasting. By infiltrating sulfur into the matrix, S/MWCNT@meso C core–shell nanocomposites were achieved. This material exhibited an initial discharge capacity of 1248 mA h g−1 although it decayed to about 640 mA h g−1 after 50 cycles. However, this performance is much better than that of S directly deposited on MWCNT (S/MWCNT) which only retained a capacity of 120 mA h g−1 after 50 cycles. Our composite exhibited excellent rate capability even at a discharge current density of 2 A g−1. The improvement in electrochemical performance is attributed to the synergetic effect between MWCNT cores, which provide electronic conduction pathways, and the mesoporous carbon shells with a relatively high surface area, which can trap sulfur/polysulfides and provide Li+ ion pathways.

Graphical abstract: Infiltrating sulfur in hierarchical architecture MWCNT@meso C core–shell nanocomposites for lithium–sulfur batteries

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Publication details

The article was received on 11 Apr 2013, accepted on 11 Apr 2013 and first published on 12 Apr 2013


Article type: Communication
DOI: 10.1039/C3CP51551F
Citation: Phys. Chem. Chem. Phys., 2013,15, 9051-9057
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    Infiltrating sulfur in hierarchical architecture MWCNT@meso C core–shell nanocomposites for lithium–sulfur batteries

    D. Wang, Y. Yu, W. Zhou, H. Chen, F. J. DiSalvo, D. A. Muller and H. D. Abruña, Phys. Chem. Chem. Phys., 2013, 15, 9051
    DOI: 10.1039/C3CP51551F

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