能源化学(英文版)

能源化学(英文版) ›› 2020, Vol. 44 ›› Issue (5): 51-60.DOI: 10.1016/j.jechem.2019.08.017

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Separator coatings as efficient physical and chemical hosts of polysulfides for high-sulfur-loaded rechargeable lithium-sulfur batteries

Masud Ranaa, Ming Lia, Qiu Hed, Bin Luob, Lianzhou Wangb, Ian Gentlec, Ruth Knibbeb   

  1. a Materials Engineering, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;
    b Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, St Lucia, The University of Queensland QLD 4072, Australia;
    c School of Chemistry and Molecular Biosciences, Faculty of Science, The University of Queensland, St Lucia, QLD 4072, Australia;
    d State School Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • 收稿日期:2019-07-05 修回日期:2019-08-15 出版日期:2020-05-15 发布日期:2020-12-18
  • 基金资助:
    Masud Rana is thankful to the Australian Government and University of Queensland for the research training program scholarship and research facilities used in this study. The authors also acknowledge the facilities and scientific and technical assistance of the Australian Microscopy and Microanalysis Research Facility at the Center for Microscopy and Microanalysis and the Australian National Fabrication Facility (ANFF-Q) at the University of Queensland.

Separator coatings as efficient physical and chemical hosts of polysulfides for high-sulfur-loaded rechargeable lithium-sulfur batteries

Masud Ranaa, Ming Lia, Qiu Hed, Bin Luob, Lianzhou Wangb, Ian Gentlec, Ruth Knibbeb   

  1. a Materials Engineering, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia;
    b Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, St Lucia, The University of Queensland QLD 4072, Australia;
    c School of Chemistry and Molecular Biosciences, Faculty of Science, The University of Queensland, St Lucia, QLD 4072, Australia;
    d State School Key Laboratory of Silicate Materials for Architectures, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2019-07-05 Revised:2019-08-15 Online:2020-05-15 Published:2020-12-18
  • Contact: Bin Luo, Ruth Knibbe
  • Supported by:
    Masud Rana is thankful to the Australian Government and University of Queensland for the research training program scholarship and research facilities used in this study. The authors also acknowledge the facilities and scientific and technical assistance of the Australian Microscopy and Microanalysis Research Facility at the Center for Microscopy and Microanalysis and the Australian National Fabrication Facility (ANFF-Q) at the University of Queensland.

摘要： Lithium-sulfur batteries (LSBs) are promising alternative energy storage devices to the commercial lithium-ion batteries. However, the LSBs have several limitations including the low electronic conductivity of sulfur (5×10-30 S cm-1), associated lithium polysulfides (PSs), and their migration from the cathode to the anode. In this study, a separator coated with a Ketjen black (KB)/Nafion composite was used in an LSB with a sulfur loading up to 7.88 mg cm-2 to mitigate the PS migration. A minimum specific capacity (Cs) loss of 0.06% was obtained at 0.2 C-rate at a high sulfur loading of 4.39 mg cm-2. Furthermore, an initial areal capacity up to 6.70 mA h cm-2 was obtained at a sulfur loading of 7.88 mg cm-2. The low Cs loss and high areal capacity associated with the high sulfur loading are attributed to the large surface area of the KB and sulfonate group (SO3-) of Nafion, respectively, which could physically and chemically trap the PSs.

关键词: Lithium-sulfur battery, Separator coating, Physical and chemical confinement, Self-discharge, High sulfur loading, Specific capacity loss, High areal capacity

Abstract: Lithium-sulfur batteries (LSBs) are promising alternative energy storage devices to the commercial lithium-ion batteries. However, the LSBs have several limitations including the low electronic conductivity of sulfur (5×10-30 S cm-1), associated lithium polysulfides (PSs), and their migration from the cathode to the anode. In this study, a separator coated with a Ketjen black (KB)/Nafion composite was used in an LSB with a sulfur loading up to 7.88 mg cm-2 to mitigate the PS migration. A minimum specific capacity (Cs) loss of 0.06% was obtained at 0.2 C-rate at a high sulfur loading of 4.39 mg cm-2. Furthermore, an initial areal capacity up to 6.70 mA h cm-2 was obtained at a sulfur loading of 7.88 mg cm-2. The low Cs loss and high areal capacity associated with the high sulfur loading are attributed to the large surface area of the KB and sulfonate group (SO3-) of Nafion, respectively, which could physically and chemically trap the PSs.

Key words: Lithium-sulfur battery, Separator coating, Physical and chemical confinement, Self-discharge, High sulfur loading, Specific capacity loss, High areal capacity