Simulation of electrochemical impedance spectroscopy

Electrochemical Impedance Spectroscopy (EIS) is employed to characterize electrochemical systems. It is often used to characterize batteries or single electrodes experimentally. In GeoDict 2026, the GeoDict software offers now a distinctive capability to simulate electrochemical impedance spectroscopy for batteries and single electrodes. With GeoDict you can use the same microstructure-based model for impedance simulation as you use for the charging simulation without the need of an equivalent circuit model. This can help you to understand your experimental EIS measurements of your cells and to parametrize your charging simulation adequately.

In GeoDict you can model or import battery or electrode microstructures. The computation of electrochemical impedance spectroscopy is currently accessible by defining expert settings. 

The GeoApp Electrochemical Impedance Spectroscopy offers a convenient option for setting the necessary expert settings and the double layer capacities of the active materials in a dialog. The computation can be run either for the fully resolved microstructure model or for a homogenized P2D Newman model. 

With these parameters defined, an Electrochemical Impedance Spectroscopy simulation is run automatically, calling the relevant BatteryDict command. A GeoDict result file is created, containing the simulation results. For easy visualization, the result file includes Nyquist plot and Bode plots for the full cell and for both electrodes. 

• Definition of double layer capacities for cathode and anode active materials
• Selection of the BatteryDict experiment type for which all other simulation parameters are defined.