Interlaboratory comparison of battery impedance analyzers calibration.

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 μ ℧ to 100m℧ across the full complex plane in a frequency range from 0.01Hz up to 5kHz. Finally, the paper summarizes practices identified as critical for achieving measurement compatibility among various labs. • Relevant for electrochemical impedance measurements of lithium-ion battery cells. • First interlaboratory comparison of low impedances in full complex plane. • First interlaboratory comparison of low impedance at frequencies down to 0.01Hz. [ABSTRACT FROM AUTHOR]