Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (02): 343-348.doi: 10.3866/PKU.WHXB201111031

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Electrochemical Performance of LiCoPO4 by Sol-Gel Method

WANG Shao-Liang, TANG Zhi-Yuan, SHA Ou, YAN Ji   

  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2011-08-19 Revised:2011-10-10 Published:2012-01-11
  • Contact: TANG Zhi-Yuan
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973124).

Abstract: High potential cathode material LiCoPO4 was synthesized by sol-gel method. The effects of different sintering conditions on the crystal structure, surface morphology and electrochemical performance of LiCoPO4 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and charge-discharge tests. The results show that the sample synthesized at 650 ° C for 12 h has a good crystalline orthorhombic olivine-type structure and a uniform particle distribution (0.2-0.4 μm), which delivers the best electrochemical performance. The discharge capacity of the sample at 1C rate can reach 122.7 mAh·g-1. Moreover, from the charge and discharge profiles, two charge/discharge plateaus are presented and they become more obvious with the increase of charge/discharge rate. This phenomenon can be interpreted by considering the two-step extraction/insertion behavior of Li+ in LiCoPO4.

Key words: Lithium-ion battery, LiCoPO4, Cathode material, Sol-gel method


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