SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (3): 427-432.DOI: 10.1016/j.cjche.2015.03.013

• MATERIALS AND PRODUCT ENGINEERING • Previous Articles    

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

Zhengwei Xiao1, Yingjie Zhang1, Guorong Hu2   

  1. 1 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2 School of Metallurgy and Environment, Central South University, Changsha 410083, China
  • Received:2014-10-08 Revised:2015-02-22 Online:2016-04-08 Published:2016-03-28
  • Supported by:

    Supported by the Natural Science Foundation of Yunnan Province(2010ZC051) and the Analysis and Testing Foundation(20140439) and the Starting Research Fund from Kunming University of Science and Technology(14118245).

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