Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 84: Poster Session - Solid-Liquid Interfaces: Reactions and Electrochemisty
O 84.8: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Analysis of the electrochemical properties of Li(Ni1/3Co1/3Mn1/3)O2−δ (NCM) thin film model cathodes — •Julius K. Dinter, Hendrik Hemmelmann, and Matthias T. Elm — Center for Materials Research, Gießen, Germany
Lithium ion batteries often suffer from capacity fading due to undesired side reaction occurring at the cathode surface. To get a deeper understanding of these side reactions, 2D model system are necessary. For this purpose, thin film NCM thin films were prepared via spin coating and annealing at high temperatures. A homogenous distribution of Ni, Co and Mn could be confirmed by EDX and SIMS measurements. The structural characteristics were analysed using Raman spectroscopy and XRD. Electrochemical properties were measured via cyclovoltammetrie and cyclopotentiometrie, confirming structural changes of the surface and an increase of the cell resistance, which indicates the formation of an solid electrolyte interface (SEI). Furthermore, the thin films were coated with Al2O3 using atomic layer deposition (ALD). Due to the coating of the NCM-thin film the long-term cycling stability could be improved and surface reactions were suppressed.