LiNbO3-coated Li1.2Mn0.54Ni0.13Co0.13O2 as a cathode material with enhanced electrochemical performances for lithium-ion batteries

Lithium-rich manganese-based cathode materials have become one of the most concerned cathode materials for high-energy lithium-ion batteries. In order to improve its electrochemical performance, Li1.2Mn0.54Ni0.13Co0.13O2 with different content LiNbO3 coatings was synthesized by mechanical ball milling. The morphology, microstructure, and electrochemical properties of the samples were investigated by X-ray diffraction, scanning electron microscope, transmission electron microscope, galvanostatic charge/discharge, electrochemical impedance spectroscopy, and cyclic voltammetry. The results show that LiNbO3 coating not only protects the cathode material from the corrosion of electrolyte and HF but also improves the migration rate of Li+ in the interface region. Notably, the 5 wt% LiNbO3-coated Li1.2Mn0.54Ni0.13Co0.13O2 exhibits capacity retention of 89.9% under 0.1 C after 100 cycles. Besides, it has a higher discharge capacity than Li1.2Mn0.54Ni0.13Co0.13O2 at different rates. LiNbO3 coating is an effective way to improve its cycle stability and rate performance of Li1.2Mn0.54Ni0.13Co0.13O2.