Abstract
LiFePO4/C composites are prepared by using two types of carbon source: one using polymer (PAALi) and the other using sucrose. The physical characteristics of LiFePO4/C composites are investigated by X-ray diffraction), scanning electron microscopy, BET, laser particle analyzer, and Raman spectroscopy. Their electrochemical properties are characterized by cyclic voltammograms, constant current charge–discharge, and electrochemical impedance spectra. These analyses indicate that the carbon source and carbon content have a great effect on the physical and electrochemical performances of LiFePO4/C composites. An ideal carbon source and appropriate carbon content can effectively increase the lithium-ion diffusion coefficient and exchange current density, decrease the charge transfer resistance (R ct), and enhance the electrochemical performances of LiFePO4/C composite. The results show that PAALi is a better carbon source for the synthesis of LiFePO4/C composites. When the carbon content is 4.11 wt.% (the molar ratio of PAALi/Li2C2O4 was 2:1), as-prepared LiFePO4/C composite shows the best combination between electrochemical performances and tap density.
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