Record Details

Title:
Electronic structure changes upon lithium intercalation into graphite – Insights from ex situ and operando x-ray Raman spectroscopy
Affiliation(s):
EuXFEL staff, Other
Author group:
Theory
Instrument MID
Topic:
Scientific area:
Abstract:
This study probes the electrochemical intercalation mechanism of Li into graphitic carbon using x-ray Raman spectroscopy (XRS), an inelastic x-ray scattering technique. Operando and high resolution spectra of electrochemically lithiated composite graphitic electrodes at discrete states of Li uptake (stages III, II and I) show gradually changing spectral features with Li intercalation, the end state agreeing well with chemically fully lithiated $LiC_{6}$ highly oriented pyrolytic graphite (HOPG). The two most dominant changes in the XRS spectrum of the C-K edge are the reduced intensity of the π* peak and shift the onset of the σ* states to lower energies upon full lithiation. The excellent instrumental energy resolution uncovered novel spectral features and, thus, electronic changes with varying lithium content. The general spectral changes with progressing Li intercalation agree well with our accompanying DFT calculations.
Imprint:
Elsevier, 2019
Journal Information:
Carbon, 143, 371-377 (2019)
Related external records:
Language(s):
English


Export


 Record created 2018-12-03, last modified 2019-02-22


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)