V-doped lithium-rich layered cathode material was prepared during the high temperature solid phase reaction step between the precursor and the lithium source.The results of the characterization and test of two cathode materials indicated that the charge transfer impedance of the material was significantly reduced after vanadium doping,and the rate performance was also effectively improved.For the 0.5wt% V-doped sample,after 150 cycle at 0.5C,the capacity rose to 164.18mAh/g and the capacity retention rate increased to 86.3% from the initial rate of 58.2%.The outstanding electrochemical performance was ascribed to the fact that the stronger binding of V—O effectively suppressed the oxygen escape,alleviated the transformation of structure,and enhanced the cycle and rate performance of the Li-rich layered cathode materials.
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