Influence of synthesis parameters on the properties of LiFePO4/C cathode material

doi:10.1016/j.cjche.2015.03.013

Abstract

Abstract: The influence of sintering temperature, carbon content and dispersive agent in ball-milling was investigated on the properties of LiFePO₄/C prepared using Fe₂O₃, NH₄H₂PO₄, Li₂CO₃ and glucose via solid state reaction.X-ray powder diffraction, scanning electron microscopy and charge-discharge testwere applied to the characterization of the LiFePO₄/C samples synthesized under different conditions.Sintering temperature affects the crystallite/particle size and degree of crystallinity of LiFePO₄, formationof Fe₂P and maintenance of carbon in LiFePO₄/C.Carbonmaintenance is favored by lowsintering temperature, and 700℃ is optimumfor synthesis of LiFePO₄/C with superior electrochemical performance.A higher carbon content in the range of 4.48%-11.03% results in a better rate capability for LiFePO₄/C.The dispersive agent used in ball-milling impacts the existent state of carbon in the final product which subsequently determines its charge-discharge behavior.The sample prepared at 700℃ by using acetone as the dispersive agent in ball-milling exhibits an excellent rate capability and capacity retention without any fade at 0.1C, 1C and 2C, with corresponding average discharge capacities of 153.8, 128.3 and 121.0 mA·h·g^-1, respectively, in the first 50 cycles.

Key words: Composite, Synthesis parameter, Sintering temperature, Carbon content, Drying, Dispersive agent

Zhengwei Xiao, Yingjie Zhang, Guorong Hu. Influence of synthesis parameters on the properties of LiFePO₄/C cathode material[J]. Chin.J.Chem.Eng., 2016, 24(3): 427-432.

Zhengwei Xiao, Yingjie Zhang, Guorong Hu. [J]. Chinese Journal of Chemical Engineering, 2016, 24(3): 427-432.

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Influence of synthesis parameters on the properties of LiFePO₄/C cathode material

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