Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 56: Materials for Energy Storage and Conversion - Intercalation

MM 56.1: Vortrag

Donnerstag, 19. März 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 Schmitz41Heisenbergstrasse 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.

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