Abstract
Abstract In this work the Warburg impedance of an 18650 Li-ion cell is investigated in the time domain for frequencies down to 0.1 mHz. The measurement data is transformed into the frequency domain and the results are compared to electrochemical impedance spectroscopy (EIS) measurements. It is found that both measurement methods lead to the same result for frequencies down to the millihertz range. For frequencies below 10 mHz an increasing deviation is observed which strongly depends on the measurement parameters – excitation direction, charge amount and charge history. A variation of these parameters can lead to a deviation of the real part of the impedance of up to 60% for the investigated cell. The results indicate that it is the OCV hysteresis which causes the deviation between subsequent time domain measurements.
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