Hollow Carbon Nanofibers Filled with MnO2 Nanosheets as Efficient Sulfur Hosts for Lithium-Sulfur Batteries

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Original languageEnglish
Pages (from-to)12886-12890
Journal / PublicationAngewandte Chemie - International Edition
Issue number44
Publication statusPublished - 1 Oct 2015
Externally publishedYes


Lithium-sulfur batteries have been investigated as promising electrochemical-energy storage systems owing to their high theoretical energy density. Sulfur-based cathodes must not only be highly conductive to enhance the utilization of sulfur, but also effectively confine polysulfides to mitigate their dissolution. A new physical and chemical entrapment strategy is based on a highly efficient sulfur host, namely hollow carbon nanofibers (HCFs) filled with MnO<sub>2</sub> nanosheets. Benefiting from both the HCFs and birnessite-type MnO<sub>2</sub> nanosheets, the MnO<sub>2</sub>@HCF hybrid host not only facilitates electron and ion transfer during the redox reactions, but also efficiently prevents polysulfide dissolution. With a high sulfur content of 71 wt % in the composite and an areal sulfur mass loading of 3.5 mg cm<sup>-2</sup> in the electrode, the MnO<sub>2</sub>@HCF/S electrode delivered a specific capacity of 1161 mAh g<sup>-1</sup> (4.1 mAh cm<sup>-2</sup>) at 0.05 C and maintained a stable cycling performance at 0.5 C over 300 cycles. Keep the sulfur: Hollow carbon nanofibers filled with MnO<sub>2</sub> nanosheets (MnO<sub>2</sub>@HCF) were synthesized and shown to be a suitable sulfur host for lithium-sulfur batteries. As the polysulfides are physically entrapped by the carbon shells and chemically bound by the MnO<sub>2</sub> nanosheets, this nanocomposite sulfur cathode displayed excellent specific/areal capacities and a good cycling stability. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • carbon nanofibers, electrochemistry, lithium-sulfur batteries, manganese dioxide, nanosheets

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