Vibrational spectroscopic study of lithium vanadium pentoxides

Abstract

The δ phase of Li 0.95V 2O 5 was prepared using a chemical intercalation reaction at ambient temperature, and the ε and γ phases were obtained from thermal treatment of the δ phase. Differential scanning calorimetry (DSC) and powder X-ray diffraction were employed to characterize the three phases. The IR and Raman spectra of V 2O 5 and the three lithiated phases were recorded at room temperature. Factor group analysis of the normal vibrational modes was used to interpret the spectra. Raman and IR spectra from 1100 to 400 cm −1 indicate that the ε phase is more structurally similar to the γ phase than the δ phase. However, significant spectral differences between the ε and γ phases are seen in the Raman spectra in the region 400–100 cm −1. The results show that vibrational spectroscopy is a powerful tool for distinguishing the δ, ε and γ phases of lithium vanadium pentoxides.