物理化学学报 >> 2007, Vol. 23 >> Issue (12): 1954-1957.doi: 10.3866/PKU.WHXB20071223

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液相球化法合成新型正极材料磷酸钒锂

侯春平; 岳敏   

  1. 深圳市贝特瑞新能源材料股份有限公司, 广东 深圳 518106
  • 收稿日期:2007-09-17 修回日期:2007-10-22 发布日期:2007-11-30
  • 通讯作者: 侯春平 E-mail:hugohou@btrchina.com

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 E-mail:hugohou@btrchina.com

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摘要： 采用液相球化法合成了具有亚微米颗粒的球形团簇微结构的新型锂离子电池正极材料磷酸钒锂(Li3V2(PO4)3). X射线衍射(XRD)分析表明, 液相球化法合成的Li3V2(PO4)3为单斜结构, 属于P21/n空间群. 扫描电镜(SEM)形貌观察表明, 合成的Li3V2(PO4)3一次颗粒粒径在亚微米数量级, 分布均匀, 团簇粒径在10 滋m左右. 电化学测试表明, 所得样品在充放电电流密度为55.6 mA·g-1, 充放电电压范围为3.0-4.3 V和3.0-4.9 V (vs Li/Li+)的最大放电容量分别可达126.67 和170.47 mAh·g-1, 首次充放电效率分别为95.6%和97.5%, 材料的循环稳定性能良好.

关键词: 锂离子电池, 正极材料, 磷酸钒锂, 液相法, 造粒

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