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  4. Mechanistic Insights into the Cycling Behavior of Sulfur Dry‐Film Cathodes
 
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2023
Journal Article
Title

Mechanistic Insights into the Cycling Behavior of Sulfur Dry‐Film Cathodes

Abstract
All-solid-state lithium-sulfur batteries (ASSB-LiS batteries) are considered among advanced candidates for next-generation energy storage systems, as they break with restrictions and limitations that liquid electrolytes impose on lithium-ion batteries and lithium-sulfur batteries (LiS-batteries), meaning enhanced safety and higher energy densities. However, investigations under realistic conditions on pouch cell level are challenging, as it is necessary to implement a scalable preparation method for sheet-type cathodes with high sulfur utilization and loading. In this study, a solvent-free process to prepare free-standing cathode sheets with low binder content down to 0.1 wt% PTFE is demonstrated. The contribution of binder and electrolyte on the conversion reaction of sulfur is discussed. Sheet-type cathodes reach nearly theoretical sulfur utilization of 1672 mAh gS-1 and outstanding reversible capacity reten-tion with 72% of initial discharge capacity after 400 cycles by adapting cut-off voltages to the stability window of the electrolyte. Furthermore, an all-solid-state pouch cell is demonstrated using the dry-film cathode, which is suc-cessfully tested for 50 cycles at different C-rates. Thickness monitoring of the cell stack gives fundamental insights into the volume change and breathing behavior of both cathode and anode.
Author(s)
Fiedler, Magdalena
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Cangaz, Sahin  
TU Dresden  
Hippauf, Felix  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Dörfler, Susanne  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Abendroth, Thomas  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Althues, Holger  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Kaskel, Stefan  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Journal
Advanced Sustainable Systems. Online journal  
Project(s)
SoLiS
Funder
Bundesministerium für Bildung und Forschung -BMBF-  
Open Access
DOI
10.1002/adsu.202200439
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • all-solid-state batteries

  • electrode sheets

  • lithium-sulfur batteries

  • low binder amount

  • solid electrolytes

  • solvent-free processing

  • thiophosphate electrolytes

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