Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 84: Poster Session - Solid-Liquid Interfaces: Reactions and Electrochemisty
O 84.9: Poster
Mittwoch, 18. März 2020, 18:15–20:00, P2/EG
Characterization of the surface properties of coated and uncoated Ni-rich NCM cathodes by conductive atomic force microscopy — •Miguel Wiche, Rajendra S. Negi, and Matthias T. Elm — Center for Materials Research, Gießen, Germany
One possibility to improve the cell performance of Lithium-ion batteries is coating of the cathode with a protective layer. The protective layer is typically an electronically insulating oxide, which suppresses side reactions at the electrode-electrolyte interface. However, a detailed understanding of the beneficial effect of the coating is still missing. Here, we present the coating of Ni-rich Li(Ni,Mn,Co)O2 (NCM) powder with Al2O3 using an atomic-layer-deposition like solution based wet-chemical process. Energy dispersive X-ray spectroscopy images confirm a homogeneous Al2O3 coating on the NCM particles. From the powders cathodes were prepared using binder and carbon as conductive additive. C-Rate and cycling tests indicate an improved electrochemical performance in comparison to cells with cathodes prepared from uncoated NCM powder. The surface of the cathodes of coated and uncoated NCM particles were investigated by conductive atomic force microscopy before and after cycling.