SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 12: Poster
DS 12.13: Poster
Wednesday, March 29, 2023, 17:00–19:00, P3
Analysis of the structural properties of Li(Ni1/3Co1/3Mn1/3)O2−δ (NCM) thin film model cathodes — Julius Konstantin Dinter and •Matthias Elm — Center for Materials Research, Justus-Liebig-University Giessen Germany, Heinrich-Buff-Ring 16, 35392 Giessen
Lithium ion batteries often suffer from capacity fading due to undesired side reactions occurring at the cathode surface. To get a deeper understanding of these side reactions, 2D model system are necessary. For this purpose, NCM thin film cathodes were prepared via spin coating followed by annealing at high temperatures. Using these thin film cathodes allow us to perform various surface sensitive measurements such as Raman microscopy, AFM, ESM, SEM and EDX. As no additives are used, we are able to study the surface reaction occurring at the cathode active material in more detail using in-situ measurements. The results reveal structural changes of the surface accompanied by an increase of the cell resistance, which confirms the formation of an SEI. Furthermore, the electrochemical performance of thin films coated with Al2O3 using atomic layer deposition (ALD) were investigated. The analysis of the surface properties confirm that coating of the NCM-thin film suppresses the undesired surface reactions resulting in an improved long-term cycling stability.