Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (03): 609-614.doi: 10.3866/PKU.WHXB20110241

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Properties of Spindle-Shaped LiFePO4 for the Cathode Material of Lithium Ion Battery

SU Chang, LU Guo-Qiang, XU Li-Huan, ZHANG Cheng, MA Chun-An   

  1. State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China
  • Received:2010-10-18 Revised:2010-11-24 Published:2011-03-03
  • Contact: ZHANG Cheng E-mail:czhang@zjut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51003095) and Research on Public Welfare Technology Application Projects of Zhejiang Province, China (2010C31121).

Abstract:

We synthesized LiFePO4 directly by a solvothermal method at low temperature and then a heat treatment was carried out to give a LiFePO4/C composite for using as a cathode in lithium ion battery. The crystal structure and the charge-discharge performance of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and galvanostatic charge-discharge testing. The results indicated that the LiFePO4 synthesized at low-temperature (120 °C) with glycerol as a solvent had a single olivine-type crystal structure and a spindle-shaped morphology with a very narrow size distribution. After heat treatment, a LiFePO4/C composite with excellent charge-discharge performance was obtained and the spindle morphology of the sample was intact. Galvanostatic charge-discharge tests showed that the prepared LiFePO4/C cathode had an initial discharge specific capacity of 147.2 mAh·g-1 at 0.1C at room temperature and it was 136.3 mAh·g-1 after 50 cycles. The average discharge specific capacities of LiFePO4/C at 0.2C, 0.5C, and 1C were about 130, 120, and 108 mAh·g-1, respectively.

Key words: Lithium ion battery, LiFePO4, Spindle-shaped, Solvothermal method, Charge-discharge performance

MSC2000: 

  • O646