Intercalation stage dependence of core electronic excitations in Li-intercalated graphite from inelastic X-ray scattering

Li and C 1s core-electron excitation spectra of electrochemically prepared stage-II and stage-I lithiated graphite were investigated by means of inelastic X-ray scattering spectroscopy. The near-edge structure is discussed, and the spectral features are interpreted using ab initio calculations. Our...

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Bibliographic Details
Published in:Applied physics letters 2017-06, Vol.110 (25)
Main Authors: Stutz, G. E., Otero, M., Ceppi, S. A., Robledo, C. B., Luque, G., Leiva, E., Barraco Díaz, D. E.
Format: Article
Language:English
Subjects:
Applied physics
Dependence
Excitation spectra
Graphite
Inelastic scattering
Intercalation
Invariance
Spectrum analysis
X-ray scattering
X-ray spectroscopy
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Summary:Li and C 1s core-electron excitation spectra of electrochemically prepared stage-II and stage-I lithiated graphite were investigated by means of inelastic X-ray scattering spectroscopy. The near-edge structure is discussed, and the spectral features are interpreted using ab initio calculations. Our results confirm the invariance of the excitation threshold for transitions from C 1s core-states to empty π * states upon Li intercalation for stage-I and show this invariance also occurs for the second stage of intercalation. A systematic shift of the σ * excitation threshold to lower energies with the Li content was observed. The Li core spectra reveal an ionic character of the intercalated Li in stage-I and in stage-II. The present results provide further valuable information for forthcoming in situ studies of lithiation/delithiation processes in graphite anodes by inelastic X-ray scattering spectroscopy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4986922