LiFePO4

as cathode material of lithium ion batteries

which was suitable for discharge at high current density

was prepared by carbon-coating and Cu2+-doping modification of pure LiFePO4 synthesized from self-prepared Li3PO4 and FeSO48226;7H2O at hydrothermal condition.The effects of hydrothermal temperature on electrochemical property and its phase composition

structure and morphology

characterized by X-ray diffraction (XRD)

transmission electron microscopy (TEM)and scanning electron microscopy (SEM)

were studied.The electrochemical performance of Cu 2+ -doped samples at room and low temperature was also investigated.The results show that the carbon-coating composite LiFePO4/C (LFP/C)synthesized hydrothermally at 200℃ for 24 h is of specific capacity of 140.7 mAh·g-1 under discharge current density of 1C (150 mA·g-1）. The performance could be further improved after LFP200/C was doped by Cu 2+

i.e.the specific capacity was 150.3mAh·g-1 and 108.7mAh·g-1 at room temperature with discharge current density 1 C and 10 C

and 97 mAh·g-1 at -30℃

respectively.