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To enhance the electrochemical properties and structure stability of the Layered Li-rich Mn-based oxides, the Nb with different contents were doped into the Li1.20[Mn0.54Ni0.13Co0.13]O2 via using the carbonate co-precipitation method. The effect of the Nb doping modification on the microstructure, morphology and electrochemical properties of the Li1.20[Mn0.54Ni0.13Co0.13]O2 cathode have been investigated by the XRD, SEM, XPS, galvanostatic discharge-charge tests and electrochemical impedance spectroscopy (EIS) techniques. The results demonstrated the Nb doping not only could enhance the cation order degree, but also contributed to enhancing the Li migration speed during cycling. The Li1.20[Mn0.54Ni0.13Co0.13]0.78Nb0.02O2 delivered about 20.6 mAh g larger than that of the pristine one at 5C high rate. In addition, the Li1.20[Mn0.54Ni0.13Co0.13]0.78Nb0.02O2 retained a much higher discharge capacity retention of 92.5% after 100 cycles. Whereas, the pristine cathode showed only 85.7% of the capacity retention under identical conditions. These results indicated that Nb doping modification could effectively enhance the electrochemical properties of Li1.20[Mn0.54Ni0.13Co0.13]O2.

Nb-Doped Li1.20[Mn0.54ni0.13co0.13]O2 Cathode Material With Enhanced Electrochemical Properties For Lithium-Ion Battery