Colorimetric determination of lithium-ion mobility in graphite composite electrodes

A new method for the determination of apparent diffusion coefficients of lithium ions in graphite electrodes was developed. In situ colorimetry – a technique relating the color of an electrode to its state of charge – was used to measure the distribution of lithium ions in model battery electrodes w...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2010-06, Vol.644 (2), p.127-131
Main Authors: Maire, Pascal, Kaiser, Hermann, Scheifele, Werner, Novák, Petr
Format: Article
Language:English
Subjects:
Electrochemical colorimetry
Lithium diffusion kinetics
Lithium-ion batteries
Porous graphite electrode
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Summary:A new method for the determination of apparent diffusion coefficients of lithium ions in graphite electrodes was developed. In situ colorimetry – a technique relating the color of an electrode to its state of charge – was used to measure the distribution of lithium ions in model battery electrodes with good local and temporal resolution. Diffusion kinetics data are obtained from the rate of equilibration of a deliberately induced heterogeneous lithium distribution. An apparent activation energy of ca. 17 kJ/mol was measured for the diffusion of lithium in a porous graphite electrode.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2009.09.011