Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 26: Materials for Energy Storage and Conversion

MM 26.1: Talk

Wednesday, April 3, 2019, 15:00–15:15, H43

Studying the cycling behavior of Silicon thin-film battery electrodes by in-situ quartz crystal microbalance — •Tobias Kohler, Efi Hadjixenophontos, and Guido Schmitz — Chair of Material Physics, Institute of Materials Science, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany

A quartz crystal microbalance (QCM) is able to detect mass changes in the nanogramm region. This makes it suitable to monitor the lithiation and delithiation of battery electrodes. Some particle-binder composite electrodes were already researched by means of QCM. However, investigations of thin-films are scarce. Here, amorphous silicon electrodes were ion beam sputter deposited onto the front electrode of the quartz crystal. By combining the QCM results with the cyclic voltammetry (CV), a variety of information can be gained. This includes a mass per charge ratio, which is similar to a conventional mass spectrometry. It opens the possibility to measure the growth of the solid electrolyte interface (SEI) and determine the species that are included therein. Different thicknesses of silicon are investigated to see the effect on the SEI layer growth. The results of the QCM are compared to electron microscopy and X-ray photoelectron emission spectra observations.