Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 56: Materials for Energy Storage and Conversion - Intercalation
MM 56.1: Talk
Thursday, March 19, 2020, 11:45–12:00, IFW D
Modulation of the optical properties of LixCo2O via Li-ion transport — •Sanaz Banifarsi1, Yug Joshi2, Robert Lawitzki3, and Guido Schmitz4 — 1Heisenbergstrasse 3, 70569 Stuttgart, Germany — 2Heisenbergstrasse 3, 70569 Stuttgart, Germany — 3Heisenbergstrasse 3, 70569 Stuttgart, Germany — 4Heisenbergstrasse 3, 70569 Stuttgart, Germany
Modulation of the optical properties of LixCo2O via Li-ion transport
Sanaz Banifarsi, Yug Joshi, Robert Lawitzki, Guido Schmitz
University of Stuttgart, Institute for Materials Science, Chair of Materials Physics.
Heisenbergstrasse 3, 70569 Stuttgart, Germany
Previous studies reveal that the electronic structure of Lithium cobalt oxide (LixCoO2, LCO) undergoes severe change upon lithium de-/intercalation. The present study probes this behavior by combining electrochemistry with Vis-NIR spectroscopy of the LCO during the battery cycling. To this aim, thin films of LCO serving as an active material were deposited on the platinum metallization (on oxidized silicon wafer, acting as current collector as well as a reflector), by ion beam sputtering. The structure of the active material is investigated by X-ray diffraction and transmission electron microscopy. The refractive index, derived from the Clausius-Mossotti dispersion equation, as a function of wavelength evolves upon lithium de-/intercalation. The study attempts at linking this evolution of the dispersion curves to the underlying electronic structure of the LCO. In addition, in situ electrochemical measurement proves electrochromic reversibility.