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Simulation of Li-Plating in Si/Graphite Composite-Electrodes

Boveleth, Lioba und Danner, Timo und Latz, Arnulf (2022) Simulation of Li-Plating in Si/Graphite Composite-Electrodes. 18th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies (ModVal 2022), 14.-16. März 2022, Hohenkammer, Germany.

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Kurzfassung

It is a common perception that the demand for high-performance batteries is constantly increasing. While the primary characteristics depend on the application, decisive criteria are energy density, safety, cost, and sustainability of the batteries. Here, Li-ion batteries play a key role especially for electric vehicles and portable electronics. How-ever, additional improvements are needed, for example, to achieve sufficient driving ranges. The per-formance characteristics of the batteries such as high energy or power density can be tuned by the electrode microstructure, composition, or choice of materials. At the negative electrode, Si compounds are mixed with graphite to increase the practical specific energies. On the one hand, Si exhibits a high theoretical capacity and is very abundant. On the other hand, Si shows a large volume expansion and low Li mobility. In order to increase the cycle life of Si containing electrodes, it is critical to trace the degradation processes responsible for their performance loss. One major aging mechanism causing fast degradation and fundamental safety risks is lithium plating. The deposition of a metallic lithium phase on the surface of Si/graphite anodes is barely studied in the literature yet crucial to improve the performance and safety of state-of-the-art Li-Ion batteries. In our contribution we present results of a homogenized model of a Si/Graphite composite electrode including models for plating on representative graphite [1] and Si particles. Moreover, we include the volume changes during lithiation and delithiation of representative Si particles and the effect on transport processes [2]. The model serves as a starting point to understand Li plating in Si containing electrodes and, eventually, the design of better Si/graphite composite-electrodes. [1] Hein et.al., ACS Appl. Energy Mater. 2020, 3, 8519−8531, DOI: 10.1021/acsaem.0c01155 [2] Chandrasekaran et. al., J Electrochem Society 2010, 157, A1139-A1151, DOI: 10.1149/1.3474225

elib-URL des Eintrags:https://elib.dlr.de/191870/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Simulation of Li-Plating in Si/Graphite Composite-Electrodes
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Boveleth, LiobaLioba.Boveleth (at) dlr.dehttps://orcid.org/0000-0001-9283-2397NICHT SPEZIFIZIERT
Danner, TimoTimo.Danner (at) dlr.dehttps://orcid.org/0000-0003-2336-6059NICHT SPEZIFIZIERT
Latz, ArnulfArnulf.Latz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:14 März 2022
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Lithium-ion battery, Composite electrode, Graphite, Silicon, Plating, Finite Volume
Veranstaltungstitel:18th Symposium on Modeling and Experimental Validation of Electrochemical Energy Technologies (ModVal 2022)
Veranstaltungsort:Hohenkammer, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:14.-16. März 2022
HGF - Forschungsbereich:Energie
HGF - Programm:Materialien und Technologien für die Energiewende
HGF - Programmthema:Elektrochemische Energiespeicherung
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Speicher
Standort: Ulm
Institute & Einrichtungen:Institut für Technische Thermodynamik > Computergestützte Elektrochemie
Hinterlegt von: Boveleth, Lioba
Hinterlegt am:12 Dez 2022 19:06
Letzte Änderung:12 Dez 2022 19:06

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