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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. 32nd Topical Meeting of the International Society of Electrochemistry: Experimental and Modelling tools for Electrochemical Energy Devices, 2022-06-19 - 2022-06-22, Stockholm, Sweden.

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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. However, additional improvements are needed, for example, to achieve sufficient driving ranges. The performance characteristics of the batteries such as high energy or power density can be tuned by the electrode microstructure, composition, or choice of materials. One such promising material for the negative electrode is Silicon: Si exhibits a high theoretical capacity and is very abundant. On the other hand, Si shows a large volume expansion and low Li mobility. Thus, to take advantage of the high theoretical capacity and to limit the deformation during cycling, Si is mixed with Graphite to produce more practical Si/Graphite composite electrodes. 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 simulation results of Si/Graphite composite electrodes including models for plating on Graphite [1] and Si particles in 3D microstructure-resolved simulations. Moreover, we developed a homogenized model of composite electrodes which also includes the volume changes during lithiation and delithiation of representative Si particles and the effect on transport processes [2]. The models serve 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/191877/
Dokumentart:Konferenzbeitrag (Vortrag)
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:19 Juni 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:32nd Topical Meeting of the International Society of Electrochemistry: Experimental and Modelling tools for Electrochemical Energy Devices
Veranstaltungsort:Stockholm, Sweden
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:19 Juni 2022
Veranstaltungsende:22 Juni 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:24 Apr 2024 20:53

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