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Issue 24, 2016
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Manganese dioxide nanosheet functionalized sulfur@PEDOT core–shell nanospheres for advanced lithium–sulfur batteries

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Abstract

Lithium–sulfur (Li–S) batteries are receiving significant attention as an alternative power system for advanced electronic devices because of their high theoretical capacity and energy density. In this work, we have designed manganese dioxide (MnO2) nanosheet functionalized sulfur@poly(3,4-ethylenedioxythiophene) core–shell nanospheres (S@PEDOT/MnO2) for high performance lithium–sulfur (Li–S) batteries. A PEDOT layer is used to address the low electrical conductivity of sulfur and acts as a protective layer to prevent dissolution of polysulfides. The MnO2 nanosheets functionalized on PEDOT further provide a high active contact area to enhance the wettability of the electrode materials with electrolytes and further interlink the polymer chains to improve the conductivity and stability of the composite. As a result, S@PEDOT/MnO2 exhibits an improved capacity of 827 mA h g−1 after 200 cycles at 0.2C (1C = 1673 mA g−1) and a further ∼50% enhancement compared to S@PEDOT (551 mA h g−1) without MnO2 functionalization. In particular, the discharge capacity of S@PEDOT/MnO2 is 545 mA h g−1 after 200 cycles at 0.5C. Our demonstration here indicates that the functionalization of inorganic nanostructures on conducting polymer coated sulfur nanoparticles is an effective strategy to improve the electrochemical cycling performance and stability of sulfur cathodes for Li–S batteries.

Graphical abstract: Manganese dioxide nanosheet functionalized sulfur@PEDOT core–shell nanospheres for advanced lithium–sulfur batteries

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Publication details

The article was received on 18 Apr 2016, accepted on 13 May 2016 and first published on 16 May 2016


Article type: Paper
DOI: 10.1039/C6TA03211G
J. Mater. Chem. A, 2016,4, 9403-9412

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    Manganese dioxide nanosheet functionalized sulfur@PEDOT core–shell nanospheres for advanced lithium–sulfur batteries

    M. Yan, Y. Zhang, Y. Li, Y. Huo, Y. Yu, C. Wang, J. Jin, L. Chen, T. Hasan, B. Wang and B. Su, J. Mater. Chem. A, 2016, 4, 9403
    DOI: 10.1039/C6TA03211G

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