Regensburg 2022 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 8: Materials for Storage and Conversion of Energy
MM 8.4: Vortrag
Montag, 5. September 2022, 16:30–16:45, H46
Analytical TEM studies of LiCoO2 thin film electrode for Li-ion batteries — •Ardavan Makvandi1, Sandra Lobe2, Michael Wolff2, Martin Peterlechner1, Christoph Gammer3, Sven Uhlenbruck2, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Münster, Germany — 2Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), Forschungszentrum Jülich GmbH, Jülich, Germany — 3Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria
LiCoO2 is the mostly used cathode material in commercial Li-ion batteries. However, only half of its theoretical capacity can be used due to the structural and chemical instability of its surface at charge voltages higher than 4.2 V. In general, interfaces (e.g. active material/coating, electrode surface/electrolyte) determine the local Li-ion transport kinetics and finally the electrochemical performance. Therefore, it is necessary to study the structure and chemistry of electrodes and electrode/electrolyte interfaces. In this work, the structure and chemistry of the bulk and surface regions of LiCoO2 thin film before and after cycling are studied using transmission electron microscopy (TEM). In this case, the effect of an Al-doped ZnO-coating layer on the stability of the electrode surface upon cycling at high charge voltage has been studied.