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MM: Fachverband Metall- und Materialphysik

MM 37: Materials for Energy Storage and Conversion - Structure of Battery Materials

MM 37.1: Vortrag

Mittwoch, 18. März 2020, 11:45–12:00, IFW D

Analytical TEM studies of LiNi_0.6Mn_0.2Co_0.2O₂, LiCoO₂, and Si electrodes for Li-ion batteries — •Ardavan Makvandi¹, Martin Peterlechner¹, Simone Casino², Tobias Gallasch², Martin Winter², and Gerhard Wilde¹ — ¹Institute of Materials Physics, University of Münster, Münster, Germany — ²MEET Battery Research Center, University of Münster, Münster, Germany

The modification of state-of-the-art electrodes by nanostructured coatings is one approach to optimize crucial parameters for applications, such as the electronic conductivity or mechanical stability. In general, interfaces (e.g. active material/coating; electrode surface/electrolyte) determine the local Li-ion transport kinetics and finally the electrochemical performance in terms of cycling stability or capacity retention. 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 LiNi_0.6Mn_0.2Co_0.2O₂ (NMC-622), LiCoO₂ (LCO), and Si electrodes after cycling are studied using transmission electron microscopy (TEM). In the case of NMC-622 and LCO electrodes, the effect of an Al doped ZnO-coating layer on the stability of the surface upon cycling is studied. Moreover, in the case of a Si electrode, the effect of a carbon-coating layer on the strain evolution caused by the volume expansion during cycling is studied.