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Unraveling Multiphase Conversion Pathways in Lithium-Sulfur Batteries through Cryo Transmission Electron Microscopy

Jean-Marc von Mentlen1, Ayça Senol Güngör1, Thomas Demuth2

  • 1Department of Information Technology and Electrical Engineering, ETH Zürich, Gloriastrasse 35, Zürich 8092, Switzerland.

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|April 24, 2025
PubMed
Summary

Researchers combined cryogenic transmission electron microscopy (cryoTEM) and operando small-angle neutron scattering (SANS) to study lithium-sulfur (Li-S) batteries. They discovered a new mechanism for lithium sulfide formation, challenging existing battery theories.

Keywords:
cryogenic transmission electron microscopyelectron energy loss spectroscopylithium–sulfur batteriesmachine learningsmall angle neutron scattering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Conversion-type batteries require multi-scale investigations for understanding complex physicochemical processes.
  • Lithium-sulfur (Li-S) batteries are a promising next-generation energy storage technology.

Purpose of the Study:

  • To investigate the nanoscale mechanisms of Li-S battery discharge.
  • To challenge the conventional understanding of polysulfide electroreduction in Li-S batteries.

Main Methods:

  • Combining cryogenic transmission electron microscopy (cryoTEM) for high-resolution imaging.
  • Utilizing operando small-angle neutron scattering (SANS) for time-resolved structural analysis.
  • Employing a convolutional neural network to accelerate SANS data analysis.

Main Results:

  • CryoTEM revealed discharge products with a biphasic structure: nanocrystalline Li2S within an amorphous Li2S matrix.
  • Operando SANS data, accelerated by AI, supported a model of disproportionation-driven deposition of Li2S2 particles.
  • These particles agglomerate and partially reduce to Li2S via solid-state conversion.

Conclusions:

  • The study challenges the conventional view of direct, stepwise electroreduction of polysulfides.
  • A combined cryoTEM and operando SANS approach is valuable for understanding complex electrochemical conversion pathways.
  • Findings advance the understanding of Li-S batteries for next-generation energy storage.