Electrochemical behavior of Li3V2(PO4)3/C composite cathode material for lithium-ion batteries

Abstract Monoclinic lithium vanadium phosphate was synthesized by a low temperature route. NH4VO3, LiOH, (NH4)2HPO4 and sucrose were used as starting materials to prepare a precursor, and Li3V2(PO4)3/C composite was finally obtained by sintering the precursor. X-ray diffraction results show that Li3V2(PO4)3 sample is monoclinic structure. The initial discharge capacities of Li3V2(PO4)3/C composite materials are 125 mA h g− 1 in the voltage range of 3.0–4.3 V, 164 mA h g− 1 in the voltage range of 3.0–4.8 V, respectively. The discharge capacity after 30 cycles at two voltage windows was held to be 122 and 142 mA h g− 1, respectively.