Communication-Novel Verification of an Impedance Model Considering Electrode Porosity and Li-Ion Diffusion in Lithium-Ion Batteries

A model composed of a transmission-line structure with a Randles-type circuit is regarded as a useful model for lithium-ion battery electrodes. However, when used for the impedance fitting analyses, the parameters needed to be given for calculations, the parameters to be practically obtained, and the accuracy of the obtained values have not been clarified yet. Herein, we reveal that parameters in this model can practically be obtained simultaneously from the impedance fitting calculations when the values of transmission-line length and diffusion length are provided. Then, their accuracy is investigated by examining the correlations between the parameters in the fitting calculations.