| Researchers worldwide are searching for high-capacity, safe, and inexpensive replacement for LiCoO2 as cathodes of Lithium-ion batteries. Layered Li(Ni1/3Co1/3Mn1/3)O2 is more attractive from point of view of high capacity, excellent safety, less toxicity, and low cost. Thus, Li (Ni1/3Co1/3Mn1/3)O2 might be one of the most promising cathode materials of Lithium-ion batteries.It would still be a challenge to the Li(Ni1/3Co1/3Mn1/3)O2 for high-power application. The kinetics of this material needs more understanding, and the high-rate performance of it to be improved. Despite the positive effect of Li(Ni1/3Co1/3Mn1/3)O2 for the electrochemical properties, the delivered capacities have shown a fading during long-term cycling, especially when the cell is charged to cut-off voltage higher than 4.2V. Better cycling life of this cathode material is in consideration.No report has been found on the effect of either Zinc or Copper to Li(Ni1/3Co1/3Mn1/3)O2. In present study, solid solution doped with Zinc or Copper have been synthesized by co-precipitation process. The powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and galvanostatic charge/discharge test. The effect of doping on the crystal structure of the materials and the chemical states of the transition metal were carefully examined. The correlation between electrochemical performance and doping were discussed.XRD results show that all the doped Li(Ni1/3Co1/3Mn1/3)O2 haveα-NaFeO2 crystal structure, which is a layered structure of R3 m space group. No impurity phase was observed in the range 0 |
PDF Full Text Request