High performed composites of LiFePO4/3DG/C based on FePO4 by hydrothermal method

Composites of spherical FePO4 and three-dimensional porous graphene (FP/3DG) were prepared through hydrothermal method, then the high-performed composites of three-dimensional graphene and LiFePO4 cathode materials (LFP/3DG/C) were prepared with the FP/3DG precursor by carbothermic reduction. Researches on the structure, morphology and electrochemical performance of the materials were carried out by XRD, SEM, Raman, EIS, CV and charge-discharge tests. The results show that the LFP/3DG/C composites exhibit excellent rate and cycling capabilities. At the current density of 0.2C, the first charge/discharge specific capacities were 167.2 mAh/g and 165.1 mAh/g, respectively, and the capacities remained 99.3% after 50 cycles; The discharge capacity was 144.7 mAh/g and the capacity remains 99.6% after 100 cycles at 1C rate, while the discharge capacity was 91.3 mAh/g at 10C rate. Compared with LFP/C materials, the LFP/3DG/C composites showed obvious improvement in rate capability and cycling stability.