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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Energy Storage and Batteries I
CPP 16.2: Vortrag
Dienstag, 18. März 2025, 10:00–10:15, H34
Structural response of advanced silicon-containing graphite anodes in commercial Li-ion batteries — •Tobias Hölderle1,2, Dominik Petz1,2, Vladislav Kochetov2, Peter Müller-Buschbaum1, and Anatoliy Senyshyn2 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2MLZ, TUM, 85748 Garching, Germany
This study explores the structural behavior of graphite anodes containing silicon additives in commercial lithium-ion batteries (LIBs) through detailed X-ray and neutron powder diffraction analyses. Silicon is increasingly utilized in advanced LIB anodes due to its potential to significantly increase energy capacity. However, its substantial volume expansion and amorphization during lithiation, complicate direct observation of lithium redistribution within the anode via diffraction techniques. Nonetheless, an indirect structural response linked to the lithiation of silicon was identified, indicated by a delayed lithium intercalation into the graphite structure. Furthermore, aging effects on high-silicon-content anodes were explored, showing the role of silicon in accelerating electrode degradation over time. These findings enhance our understanding of the complex relationship between the silicon content in the anode, structural stability, and lithium transport in advanced LIBs.
Keywords: Silicon; Graphite; Lithium-Ion batteries; Diffraction; Imaging