Electrochemical kinetics of Li insertion in nanosized high performance V^sub 2^O^sub 5^ obtained via fluorine chemistry

The kinetics of the electrochemical lithium insertion reaction in nanosized V2O5 prepared from a fluorination synthesis in solution is investigated by AC impedance spectroscopy. The experimental data are obtained vs. x in nano-LixV2O5 over the wide composition range 0 ≤ x < 1.8 and vs. temperatur...

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Published in:Electrochimica acta 2017-11, Vol.253, p.472
Main Authors: Huo, D, Laïk, B, Bonnet, P, Guérin, K, Baddour-Hadjean, R, Pereira-Ramos, J-P
Format: Article
Language:English
Subjects:
Charge transfer
Chemical diffusion
Chemical synthesis
Diffusion barriers
Diffusion coefficient
Fluorination
Fluorine
Insertion
Kinetics
Lithium
Reaction kinetics
Vanadium pentoxide
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container_title Electrochimica acta
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Laïk, B
Bonnet, P
Guérin, K
Baddour-Hadjean, R
Pereira-Ramos, J-P
description The kinetics of the electrochemical lithium insertion reaction in nanosized V2O5 prepared from a fluorination synthesis in solution is investigated by AC impedance spectroscopy. The experimental data are obtained vs. x in nano-LixV2O5 over the wide composition range 0 ≤ x < 1.8 and vs. temperature. Kinetic parameters for Li electroinsertion in nanosized V2O5 are achieved here for the first time. The charge transfer kinetics is little affected by Li content. A moderate evolution of the chemical diffusion coefficient is related to the peculiar single-phase behavior induced by the nanosize effect combined with shorter Li diffusion pathways. Comparison with experimental data obtained for microsized analogue vs. temperature reveals a much lower activation energy barrier (0.06 eV) for the lithium diffusion process in nanosized V2O5 that explains the significant improvement in electrochemical performances and especially a better rate capability. This work illustrates how nanosizing promotes the kinetics of Li insertion reaction, in agreement with the new and specific structural response of nanosized vanadium pentoxide.
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subjects Charge transfer
Chemical diffusion
Chemical synthesis
Diffusion barriers
Diffusion coefficient
Fluorination
Fluorine
Insertion
Kinetics
Lithium
Reaction kinetics
Vanadium pentoxide
title Electrochemical kinetics of Li insertion in nanosized high performance V^sub 2^O^sub 5^ obtained via fluorine chemistry
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