Correlating wavelength dependence in LiMn2O4 cathode photo-accelerated fast charging with deformations in local structure

Jason Lipton, Yuanyuan Ma, Jason A. Rӧhr, John Zhu, Hang Wang, Stephen A. Maclean, Christopher S. Johnson, André D. Taylor

Research output: Contribution to journalArticlepeer-review

Abstract

The growth in electrified transportation has benefited from the massive worldwide research efforts used to discover and improve electrode materials and electrolytes. Nevertheless, lithium-ion batteries still suffer from a slow-charging limitation. Recently, it has been demonstrated that white light illumination of LiMn2O4 provokes faster charging, improving the kinetics of delithiation without the use of nanostructured active materials. In this work, we probe the mechanism of photo-accelerated fast charging and show that Mn d-d electronic transitions occurring under red light illumination are largely responsible for the increased charging rate. It is further demonstrated through X-ray absorption spectroscopy methods that LiMn2O4 Mn–Mn bond distances shorten after d-electron excitation. The shrinkage in the crystal volume beneficially contributes to delithiation kinetics by lowering the resistance to lithium-ion conduction. Advanced materials that can absorb light to modulate their structure may provide us with a new mechanistic pathway to pursue for increasing charge transfer rates.

Original languageEnglish (US)
Article number101051
JournalCell Reports Physical Science
Volume3
Issue number9
DOIs
StatePublished - Sep 21 2022

Keywords

  • fast charging
  • lithium manganese oxide
  • lithium-ion
  • photo-chemistry
  • photo-electrochemistry

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)
  • Energy(all)
  • Physics and Astronomy(all)

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