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Electrochemical Impedance Spectroscopy of a LiFePO4/Li Half-Cell

M. Cugnet1 I. Baghdadi1 M. Perrin1
1INES - CEA, Grenoble, France

Impedance spectra of the LiFePO4/Li half-cell from the experimental data (red square) and the model simulation (blue circle).

This study demonstrates that a multiphysics model of a LiFePO4/Li half-cell can be applied to simulate the impedance results from an EIS. However, it implies that the double layer capacitance has to be taken into account, since it is responsible of the semi-circle in the impedance spectrum. A 15 min simulation allows getting a complete spectrum of the half-cell impedance from 0.1 to 200 kHz. The methodology used to adjust the three key parameters used to fit the experimental data is described. However, this work is still in progress, so we do not know exactly yet what is actually responsible of the slope observed at lower frequencies.

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