Citation: XU Ke, SHEN Lai-Fa, MI Chang-Huan, ZHANG Xiao-Gang. Synthesis and Electrochemical Performance of Graphene Modified LiFePO4 Cathode Materials[J]. Acta Physico-Chimica Sinica, ;2012, 28(01): 105-110. doi: 10.3866/PKU.WHXB201228105
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Graphene-modified mesoporous LiFePO4 microsphere composites were synthesized by a hydrothermal method and subsequent annealing. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, and galvanostatic charge-discharge techniques were used to characterize the morphology, structure and electrochemical performance of the resulting composites. The graphene-modified LiFePO4 microspheres exhibited a high discharge capacity of 141 mAh·g-1 at 1C, and 105 mAh·g-1 at 50C, while LiFePO4/C only delivered 137 mAh·g-1 at 1C, 64 mAh·g-1 at 50C in an aqueous electrolyte of 2 mol·L-1 LiNO3. The graphene-modified LiFePO4 exhibited excellent cyclability compared with LiFePO4/C, with a capacity retention of about 83.7% after 60 cycles versus about 70.2% for LiFePO4/C. The improved electrochemical performance is attributed to the formation of a three-dimensional (3D) graphene network.
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Keywords:
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Lithium iron phosphate
, - Graphene,
- Hydrothermal,
- Li-ion battery
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