Identification of LiO bands in the infrared spectra of the insertion compound δ-LiV2O5

Vanadium pentoxide, V2O5, is known for its ability to form LixV2O5 compounds by inserting Li+ ions. This insertion process can be performed by chemical or electrochemical techniques at room temperature. The infrared spectra of samples of chemically prepared 6LiV2O5 and 7LiV2O5 compounds are shown. In comparison to V2O5, the spectra exhibit one main band near 360 cm-1 which does not show any significant difference in both compounds. Spectra of LixV2O5 samples with x = 0.8 and 0.9 also show the Li-O bands but with lower intensity. Electrochemically prepared LixV2O5 compounds give the same infrared spectra as chemically prepared samples. From the isotopic shift of a band near 400 cm-1 in the spectra it is concluded that in the structure of δ-LiV2O5 the Li+ ions occupy fourfold coordinated sites.