7Li MAS-NMR and vibrational spectroscopic investigations of LixV2O5 (x=1.0, 1.2 and 1.4)

The lithium vanadate LixV2O5 (x=1.0, 1.2 and 1.4) has been prepared by solid state reaction method. The 7Li MAS-NMR, Laser Raman and Fourier Transform Infrared (FTIR) spectroscopic analysis reveals the δ-LiV2O5 and γ-LiV2O5 phase formation. The 7Li MAS-NMR spectrum shows the chemical shift around −1 and −10 ppm, which confirms the presence of γ and δ phases of lithium vanadate. The formation of δ phase and γ phase of LiV2O5 has been detected by the presence of Raman peaks at 971 and 982 cm−1. The phase transformation from δ to γ phases of LiV2O5 with lithium incorporation has been identified. The reduction in the oxidation state of vanadium (V5+ to V4+) has been identified, due to lithium incorporation. This reduction affects the vanadium oxygen bonding nature and leads to the phase transformations.