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Issue 15, 2007
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Electrochemical kinetics of porous, carbon-decorated LiFePO4 cathodes: separation of wiring effects from solid state diffusion

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Abstract

We try to identify the rate-determining step of electrochemical kinetics of a LiFePO4-carbon composite electrode by varying the mass of electrode and, additionally, by varying the charge–discharge current in a wide range. It is shown that the reversible capacity is almost independent of electrode mass at currents lower than ca. 1 C (170 mAh g−1). At higher currents, however, the reversible capacity starts to drop significantly. The electrode resistance determined from the corresponding polarization voltage shows inverse proportionality with mass at currents smaller than 1 C. At higher currents the electrode resistance is almost independent of electrode mass. We conclude that at lower currents (below 1 C) the main transport step is related to the active particles themselves (either to incorporation reaction or solid state diffusion of Li). At higher currents the contribution of electronic and ionic transport towards the active particles becomes substantial and should be taken into account when designing high-rate insertion electrodes.

Graphical abstract: Electrochemical kinetics of porous, carbon-decorated LiFePO4 cathodes: separation of wiring effects from solid state diffusion

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Article information


Submitted
02 Jan 2007
Accepted
07 Feb 2007
First published
27 Feb 2007

Phys. Chem. Chem. Phys., 2007,9, 1815-1820
Article type
Paper

Electrochemical kinetics of porous, carbon-decorated LiFePO4 cathodes: separation of wiring effects from solid state diffusion

M. Gaberscek, M. Küzma and J. Jamnik, Phys. Chem. Chem. Phys., 2007, 9, 1815
DOI: 10.1039/B618822B

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