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电化学(中英文) ›› 2010, Vol. 16 ›› Issue (1): 25-29.  doi: 10.61558/2993-074X.2031

• 研究论文 • 上一篇    下一篇

锂离子电池正极材料Li_3V_2(PO_4)_3的制备及性能研究

陈红;姜涛;王春忠;陈岗;魏英进;   

  1. 北华大学物理学院;吉林大学材料科学与工程学院;
  • 收稿日期:2010-02-28 修回日期:2010-02-28 出版日期:2010-02-28 发布日期:2010-02-28

Preparation and Characterizations of Li_3V_2(PO_4)_3 Cathode Material for Lithium Ion Batteries

CHEN Hong1,2,JIANG Tao2,WANG Chun-zhong2,CHEN Gang2,WEI Ying-jin2*   

  1. (1.College of Physics,Beihua University,Jilin 132013,Jilin,China;2.College of Materials Science and Engineering,Jilin University,Changchun 130012,China
  • Received:2010-02-28 Revised:2010-02-28 Published:2010-02-28 Online:2010-02-28

摘要: 应用碳热还原法制备了表面碳包覆的Li3V2(PO4)3材料.X射线衍射、红外光谱和透射电镜表征样品的结构及形貌.结果表明,该合成样品为纯相的Li3V2(PO4)3晶体,颗粒尺寸100nm左右.电化学阻抗谱测试表明,该材料在3.0~4.3V电位区间的锂离子扩散系数比它在3.0~4.8V区间的高约3个数量级.另外,前者的电荷转移电阻也明显低于后者.因而,其循环性能也明显优于后者的循环性能.

关键词: 锂离子电池, 正极材料, Li3V2(PO4)3, 电化学性质

Abstract: The carbon-coated Li3V2(PO4)3 was prepared by carbothermal reduction method.The structural and morphological properties of the material were studied by X-ray diffraction,FTIR and transmission electron microscopy.The synthesized material was a pure phase of Li3V2(PO4)3,with the particle size of about 100 nm.The values of Li ion diffusion coefficient of the material in the potential window of 3.0 ~ 4.3 V were nearly 3 orders larger than those in 3.0 ~ 4.8 V.In addition,the charge-transfer resistances in 3.0 ~ 4.3 V were much smaller than those in 3.0 ~ 4.8 V,leading to apparent improvement in cycling performance.This was mainly attributed to the smaller charge transfer resistance and higher Li + diffusion coefficients in the narrower potential window.

Key words: lithium-ion batteries, cathode materials Li3V2(PO4)3, electrochemical properties

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