Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (10): 2347-2352.doi: 10.3866/PKU.WHXB20110905

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Effect of Precursor Ingredient Temperature on the Performance of LiFePO4 by Hydrothermal Method

ZHAO Hao-Chuan1, SONG Yang1, GUO Xiao-Dong1, ZHONG Ben-He1, DONG Jing1, LIU Heng2   

  1. 1. College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, P. R. China
  • Received:2011-04-25 Revised:2011-06-19 Published:2011-09-27
  • Contact: ZHONG Ben-He
  • Supported by:

    The project was supported by the National Science & Technology Pillar Program of China (2007BAQ01055).

Abstract: We investigated LiFePO4 particles that were prepared by a hydrothermal reaction at different ingredient temperatures. The precursors and final LiFePO4 products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), and elemental analysis. The results show that ingredient temperature had a significant effect on the color and characteristics of the LiFePO4 precursors. High purity Li3PO4 was obtained and the formation of Fe(OH)3 in the precursors was inhibited by controlling the ingredient temperature carefully. In addition well-crystalline and free Fe3+ LiFePO4 samples were synthesized, which greatly increased the discharge capacity of the LiFePO4 cathode materials. At an ingredient temperature of 30 °C the discharge specific capacity of the as-prepared sample was found to be 156 mAh·g-1 at 0.1C rate, 151 mAh·g-1 at 0.5C rate and it remained 127 mAh·g-1 even at a rate of 10C while the cycling retention rate was 99% after 20 cycles.

Key words: Lithium ion battery, Cathode, Hydrothermal method, LiFePO4, Temperature


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