KIT | KIT-Bibliothek | Impressum | Datenschutz

Material parameters affecting Li plating in Si/graphite composite electrodes

Boveleth, Lioba; Lindner, Adrian 1; Menesklou, Wolfgang 2; Danner, Timo ; Latz, Arnulf
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1), Karlsruher Institut für Technologie (KIT)

Abstract:

Silicon is a frequently used active material in the negative electrode of lithium-ion batteries which provides significant improvements in the energy density. Due to large volume changes during cycling, it is typically mixed with graphite. Understanding the interactions of composite materials during battery operation is key to optimizing battery performance and predicting aging phenomena. Even though lithium plating is a critical degradation process, which influences both lifetime and safety, a systematic analysis of electrochemical material parameters affecting plating in composite electrodes is missing. Therefore, a parameter study is performed using 3D microstructure-resolved simulations. We investigate the influence of critical material parameters such as open-circuit potential, electronic conductivity, chemical diffusion coefficient, and exchange current density in simple and interpretable model geometries. The simulations reveal the importance of chemical diffusion and exchange current density, as well as their ratio, in predicting plating. Finally, we apply the set of material parameters to a complex electrode geometry reconstructed from FIB/SEM tomography data of commercial anode material. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000174622
Veröffentlicht am 30.09.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Elektrochemische Technologien (IAM-ET1)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.12.2024
Sprache Englisch
Identifikator ISSN: 0013-4686
KITopen-ID: 1000174622
Erschienen in Electrochimica Acta
Verlag Elsevier
Band 506
Seiten 145010
Vorab online veröffentlicht am 03.09.2024
Nachgewiesen in Web of Science
Dimensions
Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 7 – Bezahlbare und saubere Energie
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page