NMR study on Li+ ionic diffusion in LixV2O5 prepared by solid-state reaction

Li-7 -NMR measurements of Li-x V2O5 prepared by solid-state reaction were performed. The line width narrowing related to the Li+ ionic diffusion was observed in the static NMR spectrum. Both the activation energy and the onset temperature of the narrowing are lower in the beta-phase than in the other phases. A steep temperature dependence of line width was observed in the sample with Li content above x = 0.6. It produces the higher activation energy in the E-phase over a wide range of Li content at high temperature. Li-7 MAS-NMR spectra show that the samples are in the multi-phase over the entire range of 0.4< x <1.4. The Li+ ionic diffusion is discussed in relation to a complicated change in the beta-, delta-, epsilon-phase.