La-doped L13V2-XLax(PO4)3(x=0.01,0.02,and 0.03)cathode materials for lithitun ion batteries were synthesized by the microwave-assisted carbothermal reduction method(MW-CTR).The structtues and properties of the prepared samples were investigated by X-ray diffraction (XRD)and electrochemical measurements.The results showed that all the three Li3V2-xLax(PO4)3 samples had the same monoclinic structures and sharper diffraction peaks of the crystal plane compared with those of the undoped L13V2(PO4)3.The initial charge/discharge specific capacity,coulomb efficiency,and discharge decay rate of all the three Li3V2-xLax(PO4)3 samples were superior to those of the undoped Li3V2(PO4)3 sample,and the Li3V1.98La0.02(PO4)3 sample exhibited the best features among the three La-doped Li3V2-xLax(PO4)3 samPles.Electrochemical impedance spectroscopy(EIS)demonstrated that the Li3V1.98La0.02(PO4)3 sample had a lower charge transfer resistance and a higher Li ion diffusion coefficient compared with the undoped Li3V2(PO4)3 sample.
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