Synthesis and characterization of LiFePO4/(Ag + C) composite cathodes with nano-carbon webs |
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Authors: | C.H. Mi Y.X. Cao X.B. Zhao |
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Affiliation: | a College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China b College of Material Science and Engineering, Zhengzhou University, Zhengzhou 450052, China c Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract: | LiFePO4/(Ag + C) composite cathodes with a new type of nano-sized carbon webs were synthesized by two methods of an aqueous co-precipitation and a sol-gel process, respectively. Simultaneous thermogravimetric-differential thermal analysis indicates that the crystallization temperature of LiFePO4 is about 455-466 °C, which is close to the pyrolysis temperature of polypropylene, 460 °C. The silver and carbon co-modifying does not affect the olivine structure of LiFePO4 but improves its kinetics in terms of discharge capacity and rate capability. Discharge capacities were improved from 153.4 mA h g− 1 of LiFePO4/C to 160.5 mA h g− 1and 162.1 mA h g− 1 for LiFePO4/(Ag + C) cathodes synthesized by the co-precipitation and sol-gel methods, respectively. The possible reasons for the small difference in discharge capacity of two LiFePO4/(Ag + C) cathodes were discussed. AC impedance measurements show that the Ag + C co-modification decreases the charge transfer resistance of LiFePO4/(Ag + C) cathodes. |
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Keywords: | Lithium-ion batteries Cathode LiFePO4 Composite Nano-carbon webs |
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