Preparation and Characterization of LiNi0.8M0.2O2 with Various Doping Elements for Lithium Battery Cathod
锂离子电池正极材料LiNi0.8M0.2O2的制备

With doping different elements (M), a series of compounds LiNi0.8M0.2O2 used as cathode materials in lithium ion batteries were prepared by solid reaction under increased oxygen pressure. It was found that the doped Al, Mn and Ti can improve the properties in overcharge tolerance and cyclic capacity. The discharge capacity was almost kept constant after three cycles at high charging voltage ranging from 4.2 to 4.8 V. XRD and SEM analyses revealed that doping Al, Mn and Ti increased the orderness of the LiNiO2 material in the hexagonal phase and maintained the layered structure during the charging/discharging process. However, doping other elements decreased the orderness of the material structure, which clearly affected the electrochemical properties of the materials.