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Modeling the Influence of Particle Shape on Mechanical Compression and Effective Transport Properties in Granular Lithium-Ion Battery Electrodes

Becker, Verena 1; Birkholz, Oleg 1; Gan, Yixiang 1; Kamlah, Marc 1
1 Karlsruher Institut für Technologie (KIT)

Abstract:
The calendering step during manufacturing of lithium‐ion batteries is an essential process in the production, as it significantly influences the microstructure of electrodes and, therefore, the performance of the battery. Within this context, this article investigates the influence of particle shapes on the micromechanical responses during calendering and, in turn, their impact on the effective transport properties of battery electrodes. The electrodes are modeled using discrete elements. For this reason, a novel algorithm for the generation of random stress‐free particle assemblies consisting of superellipsoids is presented. The effective conductivities of solid and pore phase are calculated with a resistor network approach. In this context, a new analytical formula for calculating the individual resistance between two mechanically deformed ellipsoidal particles is presented. Furthermore, a geometrical approach is chosen for the pore phase for calculating individual resistances of pore throats in superellipsoidal particle assemblies. With the theoretical fundamentals, the effective conductivities of solid and pore phases of uniaxially compressed ellipsoidal particle assemblies are investigated. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000131161
Veröffentlicht am 15.07.2021
Originalveröffentlichung
DOI: 10.1002/ente.202000886
Scopus
Zitationen: 2
Web of Science
Zitationen: 3
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoff- und Biomechanik (IAM-WBM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 06.2021
Sprache Englisch
Identifikator ISSN: 2194-4288, 2194-4296
KITopen-ID: 1000131161
HGF-Programm 38.02.01 (POF IV, LK 01) Fundamentals and Materials
Erschienen in Energy Technology
Verlag Wiley-VCH Verlag
Band 9
Heft 6
Seiten Art.-Nr.: 2000886
Bemerkung zur Veröffentlichung Special Issue: Simulation of Mechano‐Electro‐Thermal Processes in Lithium‐Ion Batteries
Vorab online veröffentlicht am 11.03.2021
Nachgewiesen in Scopus
Dimensions
Web of Science
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