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Practical identifiability of electrochemical P2D models for lithium-ion batteries

Laue, Vincent; Röder, Fridolin; Krewer, Ulrike 1
1 Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1), Karlsruher Institut für Technologie (KIT)


Electrochemical models play a significant role in today’s rapid development and enhancement of lithium-ion batteries. For instance, they are applied for design and process optimization. More recently, model and parameter identifiability are gaining interest as thorough model parameterization is key to reliable simulation results. Especially electrochemical models are often prone to unidentifiability and overfitting due to their high number of adjustable parameters. In this article, the most common electrochemical peudo-2D model of a lithium-ion battery is parameterized. A three-step procedure is applied which considers quasi-static 3-electrode measurements of the open-circuit potential, C-rate tests, and electrochemical impedance spectra. Identifiability of each step is discussed in-depth and a general guidance for future parameterizations is derived. The conducted study reveals the insufficiency of open-circuit potential and C-rate tests to fully parameterize the electrochemical model. Highly dynamic tests, e.g., impedance spectroscopy, are required to resolve the ambiguity of diffusive and electric processes under quasi-static conditions. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000135793
Veröffentlicht am 23.07.2021
DOI: 10.1007/s10800-021-01579-5
Zitationen: 19
Web of Science
Zitationen: 16
Zitationen: 17
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0021-891X, 1572-8838
KITopen-ID: 1000135793
Erschienen in Journal of applied electrochemistry
Verlag Springer
Band 51
Heft 9
Seiten 1253–1265
Vorab online veröffentlicht am 26.06.2021
Nachgewiesen in Dimensions
Web of Science
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