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Journal of the Electrochemical Society, Vol.159, No.6, A822-A827, 2012
Ohmic Drop in LiFePO4 Based Lithium Battery Cathodes Containing Agglomerates
In the present study, the importance of thorough active material and carbon mixing for the performance of LiFePO4 based electrodes was investigated experimentally and theoretically. A simple transformation of experimental data was introduced to identify the portion of the discharge curves that corresponds to an ohmic response. This section of the experimental data was subsequently modeled using a local Ohm's law to describe the transport in different media, including agglomerates. From the fitted data, it was shown that the mixing procedure has a profound effect on agglomerate size and size polydispersity. Further, an analytical approximation of the discharge curves integrating the agglomerates transport parameter and size distribution broadness was proposed in order to facilitate future comparison between experiments and model. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.081206jes] All rights reserved.