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. NH 4 VO 3 , LiOH, (NH 4 ) 2 HPO 4 and sucrose were used as starting materials to prepare a precursor, and Li 3 V 2 (PO 4 ) 3 /C composite was finally obtained by sintering the precursor. X-ray diffraction results show that Li 3 V 2 (PO 4 ) 3 sample is monoclinic structure. The initial discharge capacities of Li 3 V 2 (PO 4 ) 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.