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Lederer, Daniel ; Schwunk, Simon ; Zillken, Fabian ; Wett, Christopher ; Turan, Bugra ; Plank, Christian ; Danzer, Michael A.:
Analysis of Non-Linearity and Non-Stationarity of Electrochemical Impedance Spectra of Lithium-Ion Batteries with Superimposed DC Current.
In: Journal of the Electrochemical Society.
Bd. 173
(2026)
.
- 040502.
ISSN 1945-7111
DOI: https://doi.org/10.1149/1945-7111/ae4274
Abstract
Electrochemical impedance spectroscopy (EIS) is a widely used technique for characterizing lithium-ion batteries. Conventional EIS assumes that the battery operates as a linear time-invariant system. However, maintaining stationarity is challenging, particularly when a superimposed direct current (DC) bias is applied. This study systematically investigated the validity of impedance measurements with varying DC bias and excitation amplitudes, analyzing the resulting non-linear and non-stationary effects. To assess the validity of impedance spectra, we employed validation techniques including the Kramers-Kronig test, total harmonic distortion, and Lissajous analysis. Additionally, we conducted electrochemical simulations based on a pseudo-two-dimensional model to replicate and further interpret the observed effects. Our results demonstrate that DC bias introduces significant impedance drift, leading to compromised validity of impedance spectra. These effects are detected throughout all investigated validation techniques, indicating a high reliability and confidence in the techniques. By combining experimental measurements, simulations, and validation methods, this study provides deeper insights into the impact of DC bias on EIS. These findings are particularly relevant for the application of EIS in battery management systems, where reliable state estimation and fault diagnostics are essential. The results emphasize the need for real-time impedance validation to ensure accurate diagnostics in dynamic battery operation.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Institutionen der Universität: | Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Elektrische Energiesysteme > Lehrstuhl Elektrische Energiesysteme - Univ.-Prof. Dr.-Ing. Michael Danzer Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayerisches Zentrum für Batterietechnik - BayBatt |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 18 Mai 2026 06:18 |
| Letzte Änderung: | 18 Mai 2026 06:18 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/97177 |