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Linking Pressure to Electrochemical Evolution in Solid-State Conversion Cathode Composites.

Elif Pınar Alsaç1, Arpan Kumar Sharma2, Sun Geun Yoon1

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

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|December 31, 2025
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Summary
This summary is machine-generated.

Solid-state batteries with sulfur, FeS2, and FeF3 cathodes face challenges from volume changes during cycling. This study links mechanical stress evolution to electrochemical reactions and material degradation, emphasizing design considerations for volume changes.

Keywords:
conversion cathodespyritesolid-state batteriesstack pressuresulfidessulfur

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • Conversion-type cathodes like sulfur, FeS2, and FeF3 offer high capacity for solid-state lithium batteries.
  • Significant volume changes during cycling cause interfacial contact loss, cracking, and degradation, limiting battery performance.

Purpose of the Study:

  • To investigate the interplay between electrochemical, mechanical, and structural changes in solid-state electrode composites.
  • To elucidate the link between stress evolution and redox reactions in sulfur, FeS2, and FeF3 cathodes.
  • To understand the impact of volume changes on solid-state battery performance.

Main Methods:

  • Real-time stack-pressure monitoring during battery cycling.
  • Synchrotron X-ray absorption spectroscopy (XAS) for in-situ structural analysis.
  • Electrokinetic and mesoscale modeling to correlate experimental data with material behavior.

Main Results:

  • Nonlinear stack pressure evolution was observed, stemming from material-specific volume changes and reaction intermediates.
  • Distinct stack pressure profiles were identified for sulfur, FeS2, and FeF3, correlating with their unique reaction pathways.
  • Mesoscale modeling revealed species evolution and the coexistence of intermediate phases at the particle level.

Conclusions:

  • The study highlights the critical role of volume changes in the performance and degradation of conversion-type cathodes in solid-state batteries.
  • Understanding material-specific volume changes and reaction mechanisms is crucial for designing stable and efficient solid-state battery systems.
  • Tailoring electrode design to accommodate volume fluctuations is essential for long-term battery cycling and reliability.