Enhanced electrochemical performance of Ni-rich layered LiNi0.9Co0.05Mn0.05O2 cathode material via synergistic modification of cerium doping and ceria coating

Structural and interfacial instabilities hinder the large-scale application of Ni-rich layered LiNi 1-x Co x Mn y O 2 ( x + y ≤ 0.4) cathode materials to electric vehicle (EV). Therefore, this manuscript introduces synergistic modification of Ce doping and CeO 2 coating to enhance electrochemical performance of LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode material. Ce doping improves the inner structure stability, reduces the cation mixing, and extends the lithium ion diffusion pathway due to high bond dissociation energy of Ce–O and large rad radius of cerium ion. CeO 2 coating layer protects the cathode/electrolyte interface from side reactions. The testing results of SEM, XPS, etc. prove that Ce doping and coating are introduced into LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode material successfully. Ce doping and coating modification enhance cycling performance. The capacity retention of modified sample is 93.3% at 1 C rate between 2.8 and 4.3 V after 100 cycles. The synergistic effects of cerium doping and ceria coating modification on the electrochemical performance and structural stability could be extended to develop high capacity cathode.