Polycrystalline V2O5 films (0.15 mum thick) have been electrochemically intercalated with Li+ at constant current, so that to obtain a set of different cation concentrations. The open circuit potential and the optical transmittance of the LixV2O5 films were followed as a function of the lithium charge. The electrochemical measurements show a reversible Li+ intercalation for x less-than-or-equal-to 1, in agreement with previous observations on pellettised V2O5 powder electrodes. Some compositions (x congruent-to 0, 0.3, 1) have been also characterized by both optical absorbtion and micro-Raman spectroscopy, which appear to be very sensitive to the Li+ content. Raman and absorbtion spectra seem to indicate a non complete recovery of the original electronic configuration and of the structure in the material after the inserted Li+ has been fully extracted via a reverse electrochemical reaction.

SPECTROSCOPIC INVESTIGATIONS OF LI-INTERCALATED V2O5 POLYCRYSTALLINE FILMS

MARIOTTO, Gino;
1994

Abstract

Polycrystalline V2O5 films (0.15 mum thick) have been electrochemically intercalated with Li+ at constant current, so that to obtain a set of different cation concentrations. The open circuit potential and the optical transmittance of the LixV2O5 films were followed as a function of the lithium charge. The electrochemical measurements show a reversible Li+ intercalation for x less-than-or-equal-to 1, in agreement with previous observations on pellettised V2O5 powder electrodes. Some compositions (x congruent-to 0, 0.3, 1) have been also characterized by both optical absorbtion and micro-Raman spectroscopy, which appear to be very sensitive to the Li+ content. Raman and absorbtion spectra seem to indicate a non complete recovery of the original electronic configuration and of the structure in the material after the inserted Li+ has been fully extracted via a reverse electrochemical reaction.
POLYCRYSTALLINE FILMS, LITHIUM INTERCALATION, RAMAN SPECTROSCOPY.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11562/434841
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