7Li and 51V NMR study on Li+ ionic diffusion in lithium intercalated LixV2O5

LixV2O5 (0.4 < x < 1.4) prepared by solid-state reaction were studied by 7Li and 51V NMR spectroscopy. 7Li NMR spectra showed a narrowing of the line width in relation to Li+ionic diffusion. Analysis of LixV2O5 using a Debye-type relaxation model showed a low activation energy 0.07 eV in the s...

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Published in:Solid state ionics 2006-01, Vol.177 (1-2), p.129-135
Main Authors: NAKAMURA, K, NISHIOKA, D, MICHIHIRO, Y, VIJAYAKUMAR, M, SELVASEKARAPANDIAN, S, KANASHIRO, T
Format: Article
Language:English
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Summary:LixV2O5 (0.4 < x < 1.4) prepared by solid-state reaction were studied by 7Li and 51V NMR spectroscopy. 7Li NMR spectra showed a narrowing of the line width in relation to Li+ionic diffusion. Analysis of LixV2O5 using a Debye-type relaxation model showed a low activation energy 0.07 eV in the sample of x=0.4 below room temperature, and revealed a Li+ionic diffusion with larger activation energy 0.5 eV above 450 K in lithium-rich samples. The latter is ascribed to the existence of a multi-phase system comprising stable - and gamma-phases, resulting from complicated phase transitions at high temperature. These shapes and shifts enable the classification of the beta-, -, delta-, and gamma-phases. The ionic diffusion of Li+ ions is discussed in relation to the complicated phase transitions.
ISSN:0167-2738
DOI:10.1016/j.ssi.2005.09.012