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Analysis of Lithium‐Ion Battery State and Degradation via Physicochemical Cell and SEI Modeling

Witt, Daniel 1; Röder, Fridolin; Krewer, Ulrike ORCID iD icon 1
1 Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1), Karlsruher Institut für Technologie (KIT)

Abstract:

The quality of lithium-ion batteries is affected by the formation of the solid electrolyte interphase (SEI). For a better understanding of its effect on cell performance and aging, fast and economically scalable SEI diagnostics are indispensable. Battery models promise to extract hardly accessible interfacial and bulk properties of the SEI from electrochemical impedance spectra and discharge data. The common analysis of only one measurement, often with empirical models, impedes a precise localization of degradation-related and performance-limiting processes. This work offers a solution by combining physicochemical SEI and cell modeling for the joint analysis of both measurement types. Our analysis highlights the minor importance of the SEI ionic conductivity for cell performance along with a significant improvement and notable effect of its interfacial properties along aging. Such a detailed understanding of the initial SEI and its evolution over time could enable, e. g., a knowledge-based optimization of the cell formation process.


Verlagsausgabe §
DOI: 10.5445/IR/1000146894
Veröffentlicht am 21.10.2022
Originalveröffentlichung
DOI: 10.1002/batt.202200067
Scopus
Zitationen: 7
Web of Science
Zitationen: 13
Dimensions
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Keramische Werkstoffe und Technologien (IAM-KWT1)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2566-6223
KITopen-ID: 1000146894
Erschienen in Batteries and Supercaps
Verlag John Wiley and Sons
Band 5
Heft 7
Seiten e202200067
Vorab online veröffentlicht am 19.05.2022
Nachgewiesen in Dimensions
Scopus
Web of Science
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