Electrochemical Impedance Spectroscopy
Calculate the complex -valued resistance called "impedance" that many battery developers and scientists use to understand the behavior of electrical components like resistors, capacitors, inductors and batteries.
Technically, this GeoApp sets expert settings for Electrochemical Impedance Spectroscopy (EIS) simulation and runs a charging simulation using the current settings in Charge Battery, Charge Electrode, Charge Homogenized Battery or Charge Homogenized Electrode in BatteryDict.
Needed Modules: BatteryDict, BatteryDict-BEST, BatteryDict-EIS |
Parameters
Clicking Edit... opens the Electrochemical Impedance Spectroscopy dialog. At the top, define a Result File Name for the result file and the result folder containing the BatteryDict charging simulation run with the EIS plots.
To automatically add the suffix "_EIS" to this result file name, check Add Suffix _EIS to BatteryDict Result File.
Choose the experiment type (Charge Battery, Charge Electrode, Charge Homogenized Battery or Charge Homogenized Electrode) and optionally the custom double layer capacities of the active materials.
Subsequently, when choosing Charge Battery or Charge Electrode for the simulation, you can use either BESTmeso (homogenized simulation) or BESTmicro (fully resolved simulation) as a solver. Charge Homogenized Battery or Charge Homogenized Electrode are always run with the BESTmeso solver.
The start condition of the Experiment tab of the selected experiment type will be used. However, instead of a (dis)charging / (de)lithation experiment, the EIS experiment at this start condition is simulated.
Results
After the BatteryDict simulation is finished the result file is opened in the Result Viewer.
The report tells you where to look for the results. Load the BatteryDict result file from the result folder (File → Open Results (*.gdr)) Additionally to the usual BatteryDict results, the report shows the Electrochemical impedance spectrum table. In the example, we used Charge Battery with the BESTmeso solver.
Under the Plots tab you find three EIS plots selectable from the pull-down menu: One Nyquist plot and two Bode plots.
The Bode plots visualize the real and imaginary part of the frequency response as well as the phase angle. All plots are shown for the full cell as well as for cathode and anode separately.
