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  4. Operando Radiography and Multimodal Analysis of Lithium-Sulfur Pouch Cells - Electrolyte Dependent Morphology Evolution at the Cathode
 
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2022
Journal Article
Titel

Operando Radiography and Multimodal Analysis of Lithium-Sulfur Pouch Cells - Electrolyte Dependent Morphology Evolution at the Cathode

Abstract
In recent years, the technology readiness level of next-generation lithium-sulfur (Li/S) batteries has shifted from coin cell to pouch cell dimensions. Promising optimizations of the electrodes, electrolytes, active materials, and additives lead to improved performance and cycling stability. However, new challenges arise with the pouch cell design and engineering (including electrode stacking and electrolyte filling), which influence the mechanistic processes of the cell. This study presents an unprecedented multimodal operando investigation of Li/S batteries on a pouch cell level and provides an inside view of material transformations during battery cycling, using X-ray radiography, electrochemical impedance spectroscopy, and spatially resolved temperature monitoring. With the comparison of two different electrolytes, new experimental details about sulfur and lithium sulfide deposition and dissolution processes are revealed and related to electrolyte and temperature distribution. Operando impedance measurements on monolayer pouch cells yield a clear correlation of electrochemical and macroscopic radiographic observations. Understanding the monolayer cells’ behavior represents an optimal foundation for further studies on multilayer pouch cell prototypes and demonstrators with the developed operando setup. Herein the proof of principle for correlated measurement methods on pouch cell level is shown, and the experimental proof of concept for sulfur crystal suppression in sparingly solvating electrolyte is visualized.
Author(s)
Müller, R.
Helmholtz-Zentrum Berlin
Manke, I.
Helmholtz-Zentrum Berlin
Hilger, A.
Helmholtz-Zentrum Berlin
Kardjilov, N.
Helmholtz-Zentrum Berlin
Boenke, Tom
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Reuter, Florian
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
Härtel, Paul
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
Risse, S.
Helmholtz-Zentrum Berlin
Zeitschrift
Advanced energy materials
Thumbnail Image
DOI
10.1002/aenm.202103432
Language
English
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Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS
Tags
  • impedance spectroscop...

  • lithium sulfur batter...

  • multimodal operando a...

  • pouch cells

  • sparingly solvating e...

  • X-ray imaging

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