Y-doped Li 3 V 2 (PO 4 ) 3 cathode materials were prepared by a carbothermal reduction(CTR) process. The properties of the Y-doped Li 3 V 2 (PO 4 ) 3 were investigated by X-ray diffraction (XRD) and electrochemical measurements. XRD studies showed that the Y-doped Li 3 V 2 (PO 4 ) 3 had the same monoclinic structure as the undoped Li 3 V 2 (PO 4 ) 3 . The Y-doped Li 3 V 2 (PO 4 ) 3 samples were investigated on the Li extraction/insertion performances through charge/discharge, cyclic voltammogram (CV), and electrochemical impedance spectra (EIS). The optimal doping content of Y was x=0.03 in Li 3 V 2–x Y x (PO 4 ) 3 system. The Y-doped Li 3 V 2 (PO 4 ) 3 samples showed a better cyclic ability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through the Y-doping. The improved electrochemical performances of the Y-doped Li 3 V 2 (PO 4 ) 3 cathode materials were attributed to the addition of Y 3+ ion by stabilizing the monoclinic structure.
