Abstract
A method of electrochemical impedance spectroscopy was used to study the reversible lithium intercalation from nonaqueous electrolyte into tin films with the thickness of 0.1–1 μm. The impedance spectra of lithium-tin (Li x Sn) electrodes have a complicated shape depending on the electrode state and prehistory; they reflect the occurrence of several consecutive and parallel processes, including the lithium migration, diffusion, and accumulation. The formation of a solid-electrolyte layer on the surface at Li intercalation into Sn is observed. Equivalent circuits are proposed that adequately model the experimental data on the Li x Sn electrodes both freshly prepared and after prolonged cycling. Problems associated with the choice of equivalent circuits and determination of their parameters, the accuracy of the diffusion coefficient determination, the trends in the parameters’ variation with electrode potential (composition) are discussed.
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Original Russian Text © A.V. Churikov, K.I. Pridatko, A.V. Ivanishchev, I.A. Ivanishcheva, I.M. Gamayunova, K.V. Zapsis, V.O. Sycheva, 2008, published in Elektrokhimiya, 2008, Vol. 44, No. 5, pp. 594–601.
The paper is published based on the materials presented at the International Conference “Fundamental Problems of Energy Conversion in Lithium Electrochemical Systems”, Ufa, 2006.
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Churikov, A.V., Pridatko, K.I., Ivanishchev, A.V. et al. Impedance spectroscopy of lithium-tin film electrodes. Russ J Electrochem 44, 550–557 (2008). https://doi.org/10.1134/S1023193508050078
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DOI: https://doi.org/10.1134/S1023193508050078