Interlaboratory comparison of battery impedance analyzers calibration
By Stanislav Mašláň, Hans He, Tobias Bergsten, Steffen Seitz, Tom Patrick Heins
Published in Elsevier
Elsevier Ltd.
2023
Abstract
The paper reports a results of series of interlaboratory comparisons of low impedance measurements at
frequencies relevant for electrochemical impedance spectroscopy (EIS) of commercial lithium-ion cells. Two
comparisons are presented. The first, bilateral comparison has focused on low impedance standards calibration
in a full complex plane using digital sampling setups. The second comparison has focused on calibration and
use of commercial 4-terminal battery EIS meters. Both comparisons have covered the impedance range from
50 μΩ to 100 mΩ across the full complex plane in a frequency range from 0.01 Hz up to 5 kHz. Finally, the
paper summarizes practices identified as critical for achieving measurement compatibility among various labs.