Electrochemical properties of LiFePO4/C synthesized using polypyrrole as carbon source |
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Authors: | Sheng-Yao Chen Bo Gao Ling-Hao Su Chang-Huan Mi Xiao-Gang Zhang |
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Institution: | (1) College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, People’s Republic of China |
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Abstract: | LiFePO4/C composites were synthesized by pyrolysis of LiFePO4/polypyrrole (PPy), which was obtained by an in situ chemical polymerization involving pyrrole monomer and hydrothermal synthesis LiFePO4. All samples were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy,
cyclic voltammetry, and galvanostatic charge–discharge techniques. The results showed the LiFePO4/C sintered at 800 °C containing 2.8 wt.% carbon exhibited a higher discharge capacity of 49.6 mAh·g−1 at 0.1 C, and bare LiFePO4 only delivered 11.6 mAh·g−1 in 2 M LiNO3 aqueous electrolyte. The possible reason for the improvement of electrochemical performance was discussed and could be attributed
to the formation of aromatic compounds during the carbonization of PPy. |
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Keywords: | LiFePO4/C Polypyrrole Carbonization Aqueous electrolyte |
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