▎ 摘　　要

Using FeSO4 center dot 7H(2)O, NH4H2PO4, H2O2, Li2CO3, C6H12O6 and GO as raw materials, LiFePO4/C/G-2 composite cathode material prepared by mixing FePO4 center dot 2H(2)O, Li2CO3 and GO and LiFePO4/C/G-1 by mixing FePO4 center dot 2H(2)O/GO and Li2CO3 were compared. Crystal structure, morphology and electrochemical performance of the two samples were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), Transmission Electron Microscope (TEM), electrochemical impedance spectroscopy (EIS) test and charge-discharge test. LiFePO4/C/G-1 showed better electrochemical performances compared to LiFePO4/C/G-2. When the chemical synthesis method product (LiFePO4/C/G-1) was charged-discharged in 2.5 similar to 4.1 V, the initial discharge capacity was 158.15 and 150.5 mAh . g(-1) at 0.1C and 1C rate, respectively. After cycling for 500 times at 1C rate, the retention of discharge capacity was 98.3%.