SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.7: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

In situ XRD measurements of a Si Li half battery cell — •Leonard Aue, Frederik Stender, Thomas Brede, and Cynthia Volkert — Georg-August-Universität Göttingen, Deutschland

Li-ion batteries have become an indispensable part of modern life. They enable the repeated storage of energy on a medium and small scale, for example in electric vehicles or mobile devices.

In addition to the commonly used graphite, silicon is gaining increasing attention as a suitable anode material due to its higher capacity. However, this capacity decreases rapidly in application and a significant increase of the internal resistance occurs. Both are mainly caused by the large volume changes during lithium uptake and release.

In this work, we investigate the amorphization process that first starts during loading in in-situ XRD measurements of Si-Li composite materials in a half-battery setup. This will give us insight into Si phase changes under direct control of critical parameters such as charge or discharge rates. This knowledge could help to understand and control the phase transformations and thereby improve Si anode performance.