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Multi-scale quantification and modeling of aged nanostructured silicon-based composite anodes

Vorauer, T.; Kumar, P.; Berhaut, C. L.; Chamasemani, F. F.; Jouneau, P.-H.; Aradilla, D.; Tardif, S.; Pouget, S.; Fuchsbichler, B.; Helfen, Lukas; Atalay, S.; Widanage, W. D.; Koller, S.; Lyonnard, S.; Brunner, R.

dvanced anode material designs utilizing dual phase alloy systems like Si/FeSi2 nano-composites show great potential to decrease the capacity degrading and improve the cycling capability for Lithium (Li)-ion batteries. Here, we present a multi-scale characterization approach to understand the (de-)lithiation and irreversible volumetric changes of the amorphous silicon (a-Si)/crystalline iron-silicide (c-FeSi$_{2}$) nanoscale phase and its evolution due to cycling, as well as their impact on the proximate pore network. Scattering and 2D/3D imaging techniques are applied to probe the anode structural ageing from nm to μm length scales, after up to 300 charge-discharge cycles, and combined with modeling using the collected image data as an input. We obtain a quantified insight into the inhomogeneous lithiation of the active material induced by the morphology changes due to cycling. The electrochemical performance of Li-ion batteries does not only depend on the active material used, but also on the architecture of its proximity.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125653
Veröffentlicht am 04.11.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2399-3669
KITopen-ID: 1000125653
HGF-Programm 56.03.10 (POF IV, LK 01) Material a. Processes f. Energy Technol.
Erschienen in Communications chemistry
Band 3
Heft 1
Seiten Art.-Nr.: 141
Nachgewiesen in Scopus
Web of Science
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