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Degradation Phenomena in Silicon/Graphite Electrodes with Varying Silicon Content

Ghamlouche, Ahmad 1; Müller, Marcus ORCID iD icon 1; Jeschull, Fabian ORCID iD icon 1; Maibach, Julia 1
1 Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS), Karlsruher Institut für Technologie (KIT)

Abstract:

The degradation phenomena of Silicon/Graphite electrodes and the effect of FEC as electrolyte additive was investigated through galvanostatic cycling, XPS analyses and SEM cross section analyses. To understand the direct influence of silicon on the electrode degradation, the silicon amount was varied between 0%–30%. By evaluating the cycling performance and the accumulated capacity loss of the different Si/Gr electrodes (cycled with and without 10 vol-% of FEC), we see that the capacity decay can be distinguished into two phenomena, where one is independent of the Si/Gr ratio while the other one depends on the Si content. As expected, adding FEC improves the cell performance and minimizes the capacity decay. Combing our XPS data and SEM cross section analyses on cycled electrodes, this improvement stems from a thin and flexible SEI including poly(vinyl carbonate) that helps maintaining the overall electrode integrity as we observe less electrode fractures and less pronounced thickness increase. Si/Gr electrodes with 10 and 20% Si content showed very similar accumulated irreversible capacity losses over 100 cycles indicating that with 10 % FEC as electrolyte additive, also higher Si contents could be feasible for future high energy density anodes.


Verlagsausgabe §
DOI: 10.5445/IR/1000157187
Veröffentlicht am 22.03.2023
Originalveröffentlichung
DOI: 10.1149/1945-7111/ac4cd3
Scopus
Zitationen: 9
Web of Science
Zitationen: 6
Dimensions
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.02.2022
Sprache Englisch
Identifikator ISSN: 0013-4651, 1945-7111
KITopen-ID: 1000157187
HGF-Programm 38.02.03 (POF IV, LK 01) Batteries in Application
Erschienen in Journal of The Electrochemical Society
Verlag Electrochemical Society
Band 169
Heft 2
Seiten Art.-Nr.: 020541
Bemerkung zur Veröffentlichung Focus Issue on Women in Electrochemistry.
Nachgewiesen in Web of Science
Scopus
Dimensions
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