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A Conductive Polypyrrole-Coated, Sulfur–Carbon Nanotube Composite for Use in Lithium–Sulfur Batteries

Authors

  • Dr. Jiazhao Wang,

    Corresponding author
    1. Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
    • Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
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  • Lin Lu,

    1. Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
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  • Dr. Dongqi Shi,

    1. Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
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  • Richard Tandiono,

    1. PT NIPRESS Tbk, J1, Raya Narogong KM, 26 Cileungsi, Bogor 16820 (Indonesia)
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  • Prof. Zhaoxiang Wang,

    1. Laboratory for Solid State Ionics, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190 (P. R. China)
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  • Dr. Konstantin Konstantinov,

    1. Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
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  • Prof. Huakun Liu

    1. Institute for Superconducting and Electronic Materials, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519 (Australia), Fax: (+61) 2-4298-1478
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Abstract

A novel ternary composite, polypyrrole (PPy)-coated sulphur–carbon nanotube (S-CNT), is synthesised by using an in situ, one-pot method. Firstly, elemental sulfur is loaded into the CNT network by a solution-based processing technique. Then conducting PPy is coated on the surface of the S-CNT composite to form the S-CNT-PPy ternary composite by carrying out polymerization of the pyrrole monomer in situ. The ternary composite is tested as a cathode for lithium–sulfur batteries. The results show that PPy coating improves significantly the performance of the binary composites (S-CNT and S-PPy). The conducting PPy is believed to serve multiple functions in the composite: as a conducting additive, an active material, and an adsorbent and container to confine the polysulfides and prevent them from dissolving into the electrolyte. As a result, PPy coating on the S-CNT composite enhances its conductivity, capacity and cycling stability. The capacity of S-CNT-PPy is about 600 mAh g−1 after 40 cycles, which is much higher than for the S-CNT composite (430 mAh g−1)

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