Regensburg 2013 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 5: Functional Materials - Battery Materials I

MM 5.4: Talk

Monday, March 11, 2013, 11:00–11:15, H26

Lithium Ion Transport in LCO-Li-SiO2 multilayer stacks — •Frank Berkemeier, Tobais Stockhoff, and Guido Schmitz — Universität Münster, Institut für Materialphysik, Wilhelm-Klemm Str. 10, D-48149 Münster

Thin films of lithium cobalt oxide (LCO) and lithium silicate glass are prepared by ion beam sputter deposition. The capability of the LCO films to reversibly store and release lithium ions is proven by means of cyclic voltammetry and chronopotentiometry, while the ionic conductivity of the silicate glass is measured by electrochemical impedance spectroscopy. Furthermore, by measuring the correlation between the transmission of visible light through the LCO films and their lithium content, the intercalation/deintercalation process is studied in detail by optical transmission measurements. Applying these transmission measurements in case of LCO films of different thickness between 10 and 500 nm, allows us to determine the interface barriers for the transfer of lithium ions from the liquid electrolyte into LCO. By depositing an additional layer of silicate glass onto the LCO film, the transmission measurements are also used to obtain quantitative information about the mobility of lithium ions within the glass film.