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O: Fachverband Oberflächenphysik

O 45: Solid-Liquid Interfaces II: Reactions and Electrochemistry

O 45.9: Vortrag

Dienstag, 17. März 2020, 12:45–13:00, WIL C107

Influence of surface coating 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, HeinrichBuff-Ring 16, 35392 Gießen

The Ni-rich NCM based cathode material has allured great research interest owing to its high energy density, high capacity and low costs. Nonetheless, the rapid capacity fading still hinders its wide range application. Surface modification became a feasible approach to handel this issue. However, achieving a homogenous coating using a simple approach is still challenging. In this work, a surface-active -OH group assisted homogenous Al2O3 coating on the NCM have been achieved. The Al2O3 coated cells show improved capacity retention (89.5% after 130 cycles) during long-term cycling test compared to pristine cells (i.e. 38.3% after 130 cycles). In addition, Electrochemical Impedance Analysis (EIS) showed the tremendous increase in cell resistance of uncoated electrodes compared to coated electrodes after long-term cycling.