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Issue 35, 2018
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Rationally designing S/Ti3C2Tx as a cathode material with an interlayer for high-rate and long-cycle lithium–sulfur batteries

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Abstract

Lithium–sulfur batteries suffer from poor cycling stability and inferior rate capability, mainly caused by low conductivity and lithium polysulfide dissolution. To tackle these problems, this work demonstrates that Ti3C2Tx “clay”, synthesized by selectively extracting the Al layers from the Ti3AlC2 phases with a mixture of HCl and LiF, is an effective host material for sulfur cathodes. To further enhance the rate performance and cycling stability of S/Ti3C2Tx composites, a single-walled carbon nanotube thin film was prepared by a simple vacuum filtration method and inserted between the cathode and the separator as an interlayer for Li–S batteries. The S/Ti3C2Tx composite with an interlayer could deliver a high initial discharge capacity of 1458 mA h g−1 at a current density of 0.1 A g−1 and an ultralow capacity decay of 0.04% per cycle at 0.8 A g−1 for over 1500 cycles was achieved. More importantly, a reversible capacity of 608 mA h g−1 was obtained at a high current density of 8.2 A g−1 (≈5C), demonstrating superior rate capability. These results suggest that the S/Ti3C2Tx composite is a promising sulfur cathode material and the introduction of the interlayer will pave the way for the future development and design of high-rate with long-cycle Li–S batteries.

Graphical abstract: Rationally designing S/Ti3C2Tx as a cathode material with an interlayer for high-rate and long-cycle lithium–sulfur batteries

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Publication details

The article was received on 17 Jul 2018, accepted on 24 Aug 2018 and first published on 24 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR05749D
Citation: Nanoscale, 2018,10, 16935-16942
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    Rationally designing S/Ti3C2Tx as a cathode material with an interlayer for high-rate and long-cycle lithium–sulfur batteries

    Q. Jin, N. Zhang, C. C. Zhu, H. Gao and X. T. Zhang, Nanoscale, 2018, 10, 16935
    DOI: 10.1039/C8NR05749D

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