Journal of Applied Electrochemistry, Vol.46, No.3, 279-287, 2016
Y-doped Li3V2(PO4)(3)/C as cathode material for lithium-ion batteries
Li3V2(PO4)(3) cathodes were prepared by applying a carbon coating and Y substitution using a rheological phase reaction process. X-ray diffraction was used to observe the structural properties of the synthesized powders. The presence of the carbon coating was confirmed by transmission electron microscopy and thermo-gravimetric analysis. The Y-doping amount plays a key role on the structure and electrochemical performance of Li3V2(PO4)(3). The Li/Li3Y0.03V2(PO4)(3)/C cell displayed a discharge capacity of 158.8 mAh g(-1) between 3.0 and 4.3 V versus Li at a current density of 0.1 C, which is similar to 30 mAh g(-1) higher than that of the undoped Li3V2(PO4)(3)/C composites. The capacity retention was found to be 93.9 % after 50 cycles and the capacity of Li3Y0.03V2(PO4)(3)/C stayed around 100 mAh g(-1) at a current density of 100 mA g(-1).
Keywords:Lithium-ion batteries;Li3V2(PO4)(3);Carbon-coated;Electrochemical performance;Rheological phase reaction