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Identifying Anode and Cathode Contributions in Li-Ion Full-Cell Impedance Spectra

Heinrich, Marco; Wolff, Nicolas; Seitz, Steffen; Krewer, Ulrike ORCID iD icon 1
1 Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1), Karlsruher Institut für Technologie (KIT)

Abstract:

Measured impedance spectra of Li-ion battery cells are often reproduced with equivalent circuits or physical models to determine losses due to charge transfer processes at the electrodes. The identified model parameters can usually not readily or unambiguously be assigned to the anode and the cathode. A new measurement method is presented that enables the assignment of features of impedance spectra of full cells to single electrodes. To this end, temperature gradients are imprinted perpendicular to the electrode layers of a single-layered Li-ion battery cell while impedance spectra are measured. The method exploits different dependences of the charge transfer processes at the electrodes on temperature. An equivalent circuit model of RC-elements and the effect of temperature on the related electrode properties is discussed to demonstrate the feasibility of the method. A reliable assignment of the change of impedance spectra to the electrode processes is shown to be possible. The assignment can be used to identify if changes in an impedance spectrum originate from the anode or the cathode.


Verlagsausgabe §
DOI: 10.5445/IR/1000148699
Veröffentlicht am 14.07.2022
Originalveröffentlichung
DOI: 10.3390/batteries8050040
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2313-0105
KITopen-ID: 1000148699
Erschienen in Batteries
Verlag MDPI
Band 8
Heft 5
Seiten Art.-Nr.: 40
Vorab online veröffentlicht am 27.04.2022
Schlagwörter electrochemical impedance spectroscopy; modelling; equivalent circuit model; process-identification; time constants; temperature distribution; measurement
Nachgewiesen in Web of Science
Dimensions
Scopus
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