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Determination of the Solid State Diffusion Coefficient of Li-ion Battery Single-Phase Materials Using Thin Model Electrodes

Titelangaben

Günther, Jonas ; Wycisk, Dominik ; Siva Dev, Rabin ; Fill, Alexander ; Birke, Kai Peter ; Moos, Ralf ; Schmidt, Jan Philipp ; Oldenburger, Marc:
Determination of the Solid State Diffusion Coefficient of Li-ion Battery Single-Phase Materials Using Thin Model Electrodes.
In: Journal of the Electrochemical Society. Bd. 172 (2025) Heft 3 . - 030525.
ISSN 1945-7111
DOI: https://doi.org/10.1149/1945-7111/adbfc5

Volltext

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Abstract

For lithium-ion batteries, the development of physico-chemical battery cell models has gained momentum. A significant challenge is the determination of the solid-state diffusion coefficient (Ds) in the active materials particles, as typically studied porous electrodes are not limited to pure solid-state effects. This work aims to develop an optimized methodology for model parameterization, improving upon the conventional Galvanostatic Intermittent Titration Technique (GITT) on porous electrode systems. Various methods are compared using a single particle model, identifying the GITT-Kang method and Impedance-Fitting as promising advancements. These methods are applied to thin electrodes consisting of a single-layer microstructure of spherical NMC622 particles (model electrodes), demonstrating an almost complete agreement with theoretical principles. For experimental application, the GITT-Kang method is preferred and adapted for the underlying microstructure. Model electrodes with minimal lithium salt concentration in the electrolyte are found to improve the determination of Ds and used to investigate the dependency of solid-state diffusion coefficient on lithium stoichiometry and temperature. A comparison with porous electrodes reveals consistent deviations with increasing layer thickness, highlighting the need for methodological advancements for these systems. The presented approach using model electrodes will serve as a reference for future work.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Funktionsmaterialien > Lehrstuhl Funktionsmaterialien - Univ.-Prof. Dr.-Ing. Ralf Moos
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Systemtechnik elektrischer Energiespeicher > Lehrstuhl Systemtechnik elektrischer Energiespeicher - Univ.-Prof. Dr. Jan Philipp Schmidt
Profilfelder > Advanced Fields > Neue Materialien
Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Materialzentrum - BayMAT
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: 03 Apr 2025 08:39
Letzte Änderung: 03 Apr 2025 08:39
URI: https://eref.uni-bayreuth.de/id/eprint/93143