Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (12): 1954-1957.doi: 10.3866/PKU.WHXB20071223

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A Novel Cathode Material Lithium Vanadium Phosphate Synthesized by Liquid-phase Sphericizing Granulation

HOU Chun-Ping; YUE Min   

  1. Shenzhen BTR New Energy Materials Inc., Shenzhen 518106, Guangdong Province, P. R. China
  • Received:2007-09-17 Revised:2007-10-22 Published:2007-11-30
  • Contact: HOU Chun-Ping

Abstract: A novel cathode material lithium vanadium phosphate with the microstructure of submicro-particles aggregate was synthesized by liquid-phase sphericizing granulation. XRD pattern showed that the crystal structure of Li3V2(PO4)3 was monoclinic and belonged to P21/n space group. SEM revealed that the diameters of the particle and aggregated particle were in submicron range and about 10 滋m, respectively, with a narrowdistribution. The electrochemical testing showed that the obtained Li3V2(PO4)3 had the maximum discharge capacity of 126.67 mAh·g-1 and initial coulombic efficiency of 95.6%in the range of 3.0-4.3 V (vs Li/Li+), and 170.47mAh·g-1 and 97.5%in the range of 3.0-4.9 V (vs Li/Li+) at a density of 55.6 mA·g-1, respectively. Moreover, the material had a better cycle stability.

Key words: Li-ion batteries, Cathode material, Lithiumvanadiumphosphate, Liquid-phase method, Sphericizing granulation