Besides the transport parameters of the pure electrolyte like the conductivity σ(T,c), the binary diffusion coefficient D±(T,c), the transference number t+(T,c), and the thermodynamic factor f±(T,c), the porosity ε and (through-plane) tortuosity τ of the electrode material are key parameters which determine the electrode’s suitability for high power applications.
In this application note, we demonstrate how to determine the through-plane tortuosity τ of a commercial lithium ion battery cathode material with known porosity and coating thickness based on the very elegant impedance spectroscopy (EIS) method presented e.g. by Landesfeind et al.
To cite this application note, please use: “Drüschler et al., rhd instruments GmbH & Co. KG, Application Note: Determination of the through-plane tortuosity of battery electrodes by EIS, March 2020”.