Li intercalation in TiO2 anatase: Raman spectroscopy and lattice dynamic studies.
Raman spectra of the electrochemically lithiated TiO2 anatase are reported. They evidence spectral features induced by Li intercalation in the high-frequency region. Emergence of these lines supports recent hypothesis [M. Wagemaker et al., J. Am. Chem. Sec. 125, 840 (2003)] for formation of short Li-O valence bonds. This suggestion is verified by the lattice dynamics simulation based on the potential model with Li-O force constants extrapolated from known studies of the lithium oxide compounds. The obtained results confirm assumption of multiple Li positions and provide assignment of all the observed spectral features.
Smirnov
M
M
Institute of Physics, Saint-Petersburg University, Petrodvoretz, 198504, Russia.
Baddour-Hadjean
R
R