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Estimation of Li-Ion Diffusion Coefficients in C₆₀ Coated Si Thin Film Anodes Using Electrochemical Techniques

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Abstract:

C₆₀ coated Si thin films were prepared sequentially by a plasma enhanced chemical vapor deposition and a plasma assisted thermal evaporation technique. The films were then utilized as anode materials for lithium ion batteries. The diffusion coefficients of Li-ions in the film electrodes were then estimated by typical electrochemical techniques such as cyclic voltammetry and electrochemical impedance spectroscopy. The diffusion coefficients determined by both methods were found to be consistent each other. The diffusion coefficient of coated samples was obviously higher than that of bare silicon thin films, indicated that the kinetic properties of lithium ion transport in silicon film electrodes were enhanced by the C₆₀ film coating on its surface.

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Diffusion in Solids and Liquids VII

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Periodical:

Defect and Diffusion Forum (Volumes 326-328)

Pages:

87-92

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.326-328.87

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Online since:

April 2012

Authors:

Arenst Andreas Arie, Joong Kee Lee

Keywords:

Anodes, Battery, Diffusion Coefficient, Electrochemical Techniques, Lithium Ions

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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