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Poly(3,4-ethylenedioxythiophene)-coated sulfur for flexible and binder-free cathodes of lithium–sulfur batteries

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Abstract

Flexible energy storage devices are becoming increasingly important for next-generation flexible electronic devices. However, the low energy density of conventional lithium-ion batteries cannot fulfill their high capacity requirement. Therefore, lithium–sulfur (Li–S) batteries with high theoretical capacity and energy density have attracted attention as new-generation energy storage devices. In this work, we designed a freestanding poly(3,4-ethylenedioxythiophene) (PEDOT)-coated diamond-shaped sulfur (D-sulfur)/single-walled carbon nanotube (SWCNT) composite cathode. The conductive PEDOT and SWCNTs effectively confined the dissolution of lithium polysulfides, and a flexible network was successfully fabricated. The D-sulfur/SWCNT composite cathode exhibited a high capacity and stable cycling performance. The initial discharge capacity reached 1520 mA h g−1 at 0.1C, and the capacity retention was 76% after 250 cycles at 0.5C. Furthermore, the D-sulfur/SWCNT was used as a flexible cathode to fabricate a prototype of a flexible Li–S battery, which shows its potential application in flexible integrated systems.

Graphical abstract: Poly(3,4-ethylenedioxythiophene)-coated sulfur for flexible and binder-free cathodes of lithium–sulfur batteries

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Publication details

The article was received on 17 Apr 2017, accepted on 22 Jul 2017 and first published on 24 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03314A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Poly(3,4-ethylenedioxythiophene)-coated sulfur for flexible and binder-free cathodes of lithium–sulfur batteries

    M. Zhang, Q. Meng, A. Ahmad, L. Mao, W. Yan and Z. Wei, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA03314A

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