RT Journal Article
T1 Physical delithiation of epitaxial LiCoO2 battery cathodes as a platform for surface electronic structure Investigation
A1 Salagre, Elena
A1 Segovia, Pilar
A1 González Barrio, Miguel Ángel
A1 Jugovac, Matteo
A1 Moras, Paolo
A1 Pis, Igor
A1 Bondino, Federica
A1 Pearson, Justin
A1 Shiwei Wang, Richmond
A1 Takeuchi, Ichiro
A1 Fuller, Elliot J.
A1 Talin, Alec A.
A1 Mascaraque Susunaga, Arantzazu
A1 Michel, Enrique G.
AB We report a novel delithiation process for epitaxial thin films of LiCoO2(001) cathodes using only physical methods, based on ion sputtering and annealing cycles. Preferential Li sputtering followed by annealing produces a surface layer with a Li molar fraction in the range 0.5 < x < 1, characterized by good crystalline quality. This delithiation procedure allows the unambiguous identification of the effects of Li extraction without chemical byproducts and experimental complications caused by electrolyte interaction with the LiCoO2 surface. An analysis by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) provides a detailed description of the delithiation process and the role of O and Co atoms in charge compensation. We observe the simultaneous formation of Co4+ ions and of holes localized near O atoms upon Li removal, while the surface shows a (2 × 1) reconstruction. The delithiation method described here can be applied to other crystalline battery elements and provide information on their properties that is otherwise difficult to obtain.
PB American Chemical Society
SN 1944-8244
YR 2023
FD 2023-07-19
LK https://hdl.handle.net/20.500.14352/115776
UL https://hdl.handle.net/20.500.14352/115776
LA eng
NO Salagre, E.; Segovia, P.; González-Barrio, M. Á.; Jugovac, M.; Moras, P.; Pis, I.; Bondino, F.; Pearson, J.; Wang, R. S.; Takeuchi, I.; Fuller, E. J.; Talin, A. A.; Mascaraque, A.; Michel, E. G. Physical Delithiation of Epitaxial LiCoO2 Battery Cathodes as a Platform for Surface Electronic Structure Investigation. ACS Appl. Mater. Interfaces 2023, 15 (30), 36224–36232. https://doi.org/10.1021/acsami.3c06147.
NO Ministerio de Ciencia e Innovación (España)
NO European Commission
NO Agencia Estatal de Investigación (España)
NO Universidad Autónoma de Madrid
NO Comunidad de Madrid
NO University of Maryland
NO United States Department of Energy
DS Docta Complutense
RD 20 abr 2025