S@FeS2 Core–Shell Cathode Nanomaterial for Preventing Polysulfides Shuttling and Forming Solid Electrolyte Interphase in High-Rate Li–S Batteries

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Autor/in:
Erscheinungsjahr:
2024
Medientyp:
Text
Schlagworte:
  • fast charge
  • Li–S batteries
  • prevention of polysulfides shuttle
  • S@FeS2 core–shell cathode
  • SEI-forming sulfur cathode
  • Electrolytes
  • Fast charging (Batteries)
  • Lithium sulfur batteries
  • Melt spinning
  • Metal casting
  • Metal castings
  • Patternmaking
  • Core shell
  • Fast charges
  • FeS 2
  • Lithium/sulfur batteries
  • Polysulfide shuttles
  • Prevention of polysulphide shuttle
  • S@FeS2 core–shell cathode
  • Solid electrolyte interphase
  • Solid electrolyte interphase-forming sulphur cathode
  • Sulfur cathodes
  • Lithium-ion batteries
Beschreibung:
  • Lithium–sulfur (Li–S) battery is a potential next-generation energy storage technology over lithium-ion batteries for high capacity, cost-effective, and environmentally friendly solutions. However, several issues including polysulfides shuttle, low conductivity and limited rate-capability have hampered its practical application. Herein, a new class of cathode active material with perfect core–shell structure is reported, in which sulfur is fully encapsulated by conductivity-enhancing FeS2 (named as S@FeS2), for high-rate application. Surface-stabilized S@FeS2 cathode exhibits a stable cycling performance under 2 – 20 times higher rates (1–2 C, charged in 30–60 min) than standard rates (e.g., 0.1–0.5 C, charged in 2–10 h), without polysulfides shuttle event. Surface analysis results reveal the unprecedented formation of a stable solid electrolyte interphase (SEI) layer on S@FeS2 cathode, which is distinguished from other sulfur-based cathodes that are not able to form the SEI layer. The data suggest that the prevention of polysulfides shuttling is owing to the surface protection effect of FeS2 shell and the SEI layer formation overlying core–shell S@FeS2. This unique and potential material concept proposed in the present study will give insight into designing a prospective fast charging Li–S battery. © 2024 The Author(s). Small published by Wiley-VCH GmbH.
Lizenz:
  • info:eu-repo/semantics/openAccess
Quellsystem:
Forschungsinformationssystem der UHH
Interne Metadaten
Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/81c05064-c8a0-45bb-8640-1afc5f7ca798