@article{c24d5ce8abf748bf9cf95d8b82d8d323,
title = "Correlating wavelength dependence in LiMn2O4 cathode photo-accelerated fast charging with deformations in local structure",
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.",
keywords = "fast charging, lithium manganese oxide, lithium-ion, photo-chemistry, photo-electrochemistry",
author = "Jason Lipton and Yuanyuan Ma and Rӧhr, {Jason A.} and John Zhu and Hang Wang and Maclean, {Stephen A.} and Johnson, {Christopher S.} and Taylor, {Andr{\'e} D.}",
note = "Funding Information: This work was supported by funding from Royal Dutch Shell plc. We are grateful for the assistance of Dr. Tony Hu at the Department of Chemistry of New York University with the X-ray diffraction analysis, and we are thankful for the support of the X-ray facility by the National Science Foundation under award number CRIF/CHE-0840277 and by the NSF MRSEC Program under award numbers DMR-0820341 and DMR-1420073 . We are grateful to Dr. Wesley Dose for fruitful discussions about preliminary work. We are grateful to Prof. Ayaskanta Sahu for access to the UV-vis spectrometer. We are also grateful to Dr. Hacksung Kim for his assistance in conducting XAS measurements and to Dr. Jeremy Kropf for his help in analyzing the XAS results. MRCAT operations are supported by the Department of Energy and the MRCAT member institutions . This research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357 . We are grateful to Dr. Yujia Kim and Dr. Mark Warren for XAS experimental support. J.L. is grateful to the Department of Energy Office of Science Graduate Student Research Fellowship and Air Force Research Lab Workforce Development Fellowship for support during this work. Publisher Copyright: {\textcopyright} 2022 The Authors",
year = "2022",
month = sep,
day = "21",
doi = "10.1016/j.xcrp.2022.101051",
language = "English (US)",
volume = "3",
journal = "Cell Reports Physical Science",
issn = "2666-3864",
publisher = "Cell Press",
number = "9",
}