Abstract
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 thermogravimetric 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 ~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. The Li3V2(PO4)3/C samples (LVP) doped with different amounts of Y were synthesized. And the results show that the Y-doping amount plays a key role on the structure and electrochemical performance of Li3V2(PO4)3/C. The cycle performance of the samples is very good and the reversible capacity of the as-prepared Li3Y0.03V2(PO4)3/C is higher than the theoretical capacity (148.99 mAh g−1 after 50 cycles).
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