Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (8): 1436.doi: 10.7503/cjcu20160925

• Physical Chemistry • Previous Articles     Next Articles

Freeze-drying Synthesis and Characterization of Li2FeSiO4/C Cathode Materials for Lithium Ion Batteries

ZHANG Dong1, LI Haoming1, QIU Hailong1, CHEN Gang1, YUE Huijuan2, LIU Anhua2,3   

  1. 1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China;
    3. Key Laboratory of High Performance Ceramic Fibers of Ministry of Education, College of Materials, Xiamen University, Xiamen 361005, China
  • Received:2016-12-22 Revised:2017-07-17 Online:2017-08-10 Published:2017-07-17
  • Supported by:

    Supported by the Science and Technology Development Planning of Jilin Province, China(No.20150204030GX), the Natural Science Foundation of Jilin Province, China(No.20160101320JC) and the Open Fund of Key Laboratory of High Performance Ceramic Fibers, Ministry of Education, Xiamen University, China(No.201602).

Abstract:

Li2FeSiO4/C nanocomposites were prepared by freeze-dying synthesis. X-ray diffraction, Raman spectrometry, field emission scanning electron microscopy and N2 adsorption-desorption were used to investigate the effect of dry method on the physical characteristics of Li2FeSiO4/C. The results show that Li2FeSiO4 obtained by freeze-drying method(DG) exhibits smaller particle size and larger specific surface area. The electrochemical performance was studied by galvanostatic charge-discharge and electrochemical impedance spectra. Compared to the Li2FeSiO4 obtained by ordinary drying method(HG), DG exhibits better rate capability, and the discharge capacity of 106.7 mA·h/g can be achieved at 2C rate.

Key words: Lithium ion battery, Cathode material, Li2FeSiO4, Freeze-drying, Lithium ion battery, Cathode material, Li2FeSiO4, Freeze-drying

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