Physico-chemical modelling of Li-ion batteries: Parameter analysis in the frequency domain

In this article an impedance based analysis of a physico-chemical model is presented. This method facilitates identifying the influence of various internal cell parameters on the resulting impedance spectrum. Thus, a precise correlation between a particular parameter or even a set of parameters and the observed frequency characteristics of a full cell can be revealed. For the specific case investigated here, the anode side can be identified as having the dominating impact on the impedance characteristics of the cell. Moreover, the effect of varying diffusion coefficients is astonishingly negligible compared to the particle radius or reaction rates at each electrode side.