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Polyoxometalate Modified Separator for Performance Enhancement of Magnesium–Sulfur Batteries

Ji, Yuanchun; Liu-Théato, Xinyang; Xiu, Yanlei; Indris, Sylvio; Njel, Christian; Maibach, Julia; Ehrenberg, Helmut; Fichtner, Maximilian; Zhao-Karger, Zhirong

Abstract:
The magnesium–sulfur (Mg‐S) battery has attracted considerable attention as a candidate of post‐lithium battery systems owing to its high volumetric energy density, safety, and cost effectiveness. However, the known shuttle effect of the soluble polysulfides during charge and discharge leads to a rapid capacity fade and hinders the realization of sulfur‐based battery technology. Along with the approaches for cathode design and electrolyte formulation, functionalization of separators can be employed to suppress the polysulfide shuttle. In this study, a glass fiber separator coated with decavanadate‐based polyoxometalate (POM) clusters/carbon composite is fabricated by electrospinning technique and its impacts on battery performance and suppression of polysulfide shuttling are investigated. Mg–S batteries with such coated separators and non‐corrosive Mg[B(hfip)4]2 electrolyte show significantly enhanced reversible capacity and cycling stability. Functional modification of separator provides a promising approach for improving metal–sulfur batteries.

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Verlagsausgabe §
DOI: 10.5445/IR/1000131409
Veröffentlicht am 16.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1616-301X, 1057-9257, 1099-0712, 1616-3028
KITopen-ID: 1000131409
Erschienen in Advanced Functional Materials
Verlag Wiley-VCH Verlag
Vorab online veröffentlicht am 29.03.2021
Schlagwörter functional separator; magnesium–sulfur batteries; polysulfide shuttle
Nachgewiesen in Scopus
Web of Science
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