Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 9: Layer Deposition (ALD, MBE, Sputtering, ...)

DS 9.2: Talk

Monday, April 1, 2019, 15:15–15:30, H39

Influence of surface modification on electrochemical performance of Ni-rich NCM cathodes for Lithium ion batteries — •Rajendra Singh Negi and Matthias T. Elm — Center for Materials Research, Justus-Liebig-University Gießen, Germany, Heinrich- Buff-Ring 16, 35392 Gießen

Ultrathin Al2O3 coatings were applied to Ni-rich NCM powder using atomic layer deposition (ALD) in order to create a protective barrier layer at electrode-electrolyte interface. The results of FIB-scanning electron microscopy and transmission electron microscope images show a homogeneous and conformal Al2O3 coating on the surface of Ni-rich NCM powder. C-rate and cycling tests show that the Al2O3 coating Improves the electrochemical performance with a higher capacity retention as compared to pristine cathodes at room temperature under 0.5C. The superior performance is attributed due to the suppression of side reactions at the interface between the active cathode powder and the electrolyte.