Effect of Nano TiO2 Coating on Electrochemical Performance of the Li1.2Mn0.6Ni0.2O2 Cathode Materials

In this paper, a Li-rich cathode material Li1.2Mn0.6Ni0.2O2 is modified by the nanoscale TiO2 coating using a simple and controllable hydrolyzation method. The effect of nanoscale TiO2 coating on the bulk structure, surface morphology and electrochemical performance are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and electrochemical techniques, respectively. The results show that the nanosize TiO2 can be well coated on the surface of the cathode material. The coating layers have no influence on the bulk structure of the cathode material, while they can improve the initial discharge capacity, columbic efficiency and cycling performance.