Kinetic Study of the Lithium Electroinsertion in V 2 O 5 by Impedance Spectroscopy

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Abstract
The kinetics of the lithium electroinsertion in vanadium pentoxide was studied vs. composition bronzes formed during the two first processes , by means of complex impedance spectroscopy between 104 and 10−3 Hz at 20° and 50°C in carbonate solutions. The interfacial charge transfer process is found to be independent of . At 20°C, the exchange current density is equal to and the chemical coefficient diffusion, , varies between 10−9 and 10−11 cm2 s−1, with a minimum value for . The partial conductivity of lithium in is found to vary between 10−6 and 10−7 Ω−1 cm−1. The and values at 50°C are five to six times greater than those at 20°C. The dependence of on the composition of the bronzes composition was correlated with structural and thermodynamic data already reported in the literature.

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