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›› 2006, Vol. 6 ›› Issue (4): 670-673.

• 材料工程专栏 • 上一篇    下一篇

锂钒氧化物的液相法合成及电化学性能

刘丽英,田彦文,翟玉春,徐茶清   

  1. 东北大学材料与冶金学院
  • 出版日期:2006-08-20 发布日期:2006-08-20

Research on Liquid-state Reaction Synthesis and Electrochemical Property of Lithium Vanadium Oxide

LIU Li-ying,TIAN Yan-wen,ZHAI Yu-chun,XU Cha-qing   

  1. Institute of Materials & Metallurgy, Northeastern University
  • Online:2006-08-20 Published:2006-08-20

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被引次数

3

摘要： 采用液相法合成锂离子电池正极材料锂钒氧化物. 通过XRD, TG-DTA分析确定了合成反应的主要历程. 采用XRD及SEM、恒电流充放电、循环伏安测试研究了产物Li1+xV3O8的物理和电化学特征. 结果表明，该法合成的产物为单一相层状结构，颗粒均匀，首次放电容量达288.9 mA×h/g, 15次后仍保持在264.0 mA×h/g，容量保持率为91.38%，充放电效率在95%以上. Li＋在Li1+xV3O8中的嵌入过程是分步进行的.

关键词: 锂离子电池, 正极材料, 锂钒氧化物, 液相反应, 合成机理, 电化学性能

Abstract: Lithium vanadium oxide was synthesized by a liquid-state reaction method. The main reaction mechanism was determined by XRD and TG-DTA analysis. Physical characteristics and electrochemical performances of Li1+xV3O8 were investigated by XRD, SEM, galvanostatic charge-discharge and cyclic voltammogram tests. The results indicated that the as-synthesized material had pure layered structure and was evengranular. A maximum reversible capacity of 288.9 mA×h/g for the first cycle and 264.0 mA×h/g after 15 cycles were obtained and charge-discharge efficiency was above 93.84%. Insertion of Li＋ in Li1+xV3O8 proceeded step by step.

Key words: lithium-ion battery, cathode material, ithium vanadium oxide, liquid-state reaction, reaction mechanism, electrochemical property