Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 43: SYLI: Symposium Interfacial Challenges in Solid-State Li Ion Batteries - hybrid and structured electrolytes

MM 43.4: Talk

Wednesday, March 22, 2017, 12:30–12:45, IFW A

Modulation of the optical properties of LiMn2O4 via Li-ion transport — •Yug Joshi, Susann Nowak, and Guido Schmitz — Institut für Materialwissenschaft, Universität Stuttgart

Extensive research has been carried out in the fields of Li-ion batteries and electrochromic materials. The present study combines both in investigating the changes in the optical properties of the lithium manganese oxide (LMO), a spinel structured cathode material during an electrochemical reaction. To study this behaviors ion-beam sputtering is used to deposit LMO as the active layer onto a layer of platinum serving as a current collector, over an oxidized silicon wafer. The multi-layered sample is then characterized using optical spectroscopy at different lithiation states. The measured data is fitted using Cauchy's model to extract the complex refractive index (refractive index and absorption coefficient) of LMO and its dependence on the lithium content. The reversibility of the optical changes is verified by in-situ optical measurements during multiple charging and dis-charging cycles of LMO. The study reveals a reversible change of the complex refractive index during an electrochemical reaction in the wavelength range of 850-1600nm, making it a suitable candidate for the application of optical switching.