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.