journal6 ›› 2004, Vol. 25 ›› Issue (4): 53-57.

• 重点学科 • 上一篇    下一篇

锂离子在LiMn2O4正极材料中的界面过程

  

  1. (吉首大学化学化工学院,湖南 吉首 416000)
  • 出版日期:2004-12-15 发布日期:2012-09-22
  • 作者简介:肖卓炳(1961-),男,湖南省沅江市人,吉首大学化学化工学院副教授,主要从事电池材料研究.
  • 基金资助:

    湖南省自然科学基金资助项目(03JJY6005);湖南省教育厅自科基金资助项目(01C308)

Studies on the Interfacial Process of Lithium Ion in the Cathode Material of LiMn2O4

  1. (College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2004-12-15 Published:2012-09-22

摘要:采用交流阻抗法研究了锂离子在LiMn2O4正极材料中的界面过程.结果表明:LiMn2O4电极的交流阻抗复平面图中高频区的半圆,是由电解液中的锂离子在LiMn2O4表面吸附形成表面层的电阻和电容引起的,中频区的半圆是由电极LiMn2O4内的电荷转移反应电阻和双电层电容引起的,而低频区的直线则是由锂离子在LiMn2O4中的扩散引起的.

关键词: 锂离子, 界面过程, 阻抗

Abstract: The interfacial process of lithium ion in the cathode material of LiMn2O4 was investigated through the technique of impedance spectroscopy.The results show that the semicircle in the high frequency range is associated with the resistance and capacitance caused by the absorption of lithium ion of electrolyte onto the surface of LiMn2O4The semicircle in the middle frequency range is caused by the charge-transfer resistance and double-layer capacitance.The inclined line in the low frequency range is caused by the diffusion of lithium ion in LiMn2O4.

Key words: Lithium ion, interfacial process, impedance

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