Citation: HU Guo-Rong, PENG Qing-Yuan, PENG Zhong-Dong, CAO Yan-Bing, DU Ke. Comparison on Properties of Lithium Iron Phosphate/Graphene Composite Prepared by Two Methods[J]. Chinese Journal of Inorganic Chemistry, ;2015, (6): 1153-1158. doi: 10.11862/CJIC.2015.167
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Using FeSO4·7H2O, NH4H2PO4, H2O2, Li2CO3, C6H12O6 and GO as raw materials, LiFePO4/C/G-2 composite cathode material prepared by mixing FePO4·2H2O, Li2CO3 and GO and LiFePO4/C/G-1 by mixing FePO4·2H2O/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 2.5~4.1 V, the initial discharge capacity was 158.15 and 150.5 mAh·g-1 at 0.1Cand 1Crate, respectively. After cycling for 500 times at 1Crate, the retention of discharge capacity was 98.3%.
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