Improving performance of cathode NMC-811 by CeO₂-coating for Li-ion battery

The high energy density layered oxide LiNi_0.8Mn_0.1Co_0.1O₂ (NMC811) holds great promise as a cathode material for future Li-ion batteries. However, its application in electric vehicles is hindered by issues such as inadequate cycle performance and rate capability. Additionally, the corrosion caused by the electrolyte poses limitations on high voltage operation. In this study, Cerium Oxide (CeO₂) was used to coat NMC811 using wet chemical method followed by heat treatment. Distilled water was used to dissolve Ce salt instead of ethanol so that it can reduce coating costs and is more environmentally friendly. XRD analysis showed no significant change in the hexagonal crystal structure of NMC811 material but the appearance of small CeO₂ peaks in patterns. Electrochemical test of CeO₂ coated NMC811 exhibited 18% and 9% higher cyclic and rate performance, respectively in comparison to pristine material.