J4 ›› 2013, Vol. 51 ›› Issue (01): 120-123.

• 物理 • 上一篇    下一篇

立方晶系Li0.29Ni0.71O的电化学性质

陈红1, 王庆伟2, 别晓非3, 杜菲3, 王春忠3, 寇春雷1   

  1. 1. |北华大学 物理学院, 吉林 吉林 132013|2. 吉林师范大学 环境友好材料制备与应用省部共建教育部重点实验室, 吉林 四平 136000|3. 吉林大学 物理学院, 长春 130012
  • 收稿日期:2012-05-09 出版日期:2013-01-26 发布日期:2013-01-31
  • 通讯作者: 王春忠 E-mail:wcz@mail.jlu.edu.cn

Electrochemical Performance of Cubic |Crystal System Li0.29Ni0.71O

CHEN Hong1, WANG Qing wei2, BIE Xiao fei3, DU Fei3, WANG Chun zhong3, KOU Chun lei1   

  1. 1. College of Physics, Beihua University, Jilin 132013, Jilin Province, China;
    2. Key Laboratory of Preparation and Applications of Environmental Friendly Materials of Ministry of Education, Jilin Normal University, |Siping 136000, Jilin Province, China|3. College of Physics, Jilin University, Changchun 130012, China
  • Received:2012-05-09 Online:2013-01-26 Published:2013-01-31
  • Contact: WANG Chun zhong E-mail:wcz@mail.jlu.edu.cn

摘要:

采用熔盐法用Li+ 取代NiO中Ni2+制备了Li0.29Ni0.71O材料,  研究Li+取代Ni2+对材料电化学性能的影响, 并利用电化学阻抗谱(EIS)研究材料的电化学动力学性能.    结果表明:  Li0.29Ni0.71O比NiO的电化学容量稍小; 首次充放电循环后, 在材料中形成Li2O; 表面膜(SEI)阻抗的降低和电化学扩散率的增加与材料由晶体转变为非晶态有关.

关键词: 电化学, 负极材料, 熔盐法, 电化学阻抗谱

Abstract:

A typical Li+ substituted NiO compound, Li0.29Ni0.71O, was synthesized by molten nitrate method, and the effect of Li+ ions doped on the electrochemical performance was also studied. The materail showed a smaller electrochemical capacity compared to NiO. In addition, there was an irreversible formation of Li2O in the first discharge\|charge cycling. The kinetic behavior of Li0.29Ni0.71O was investigated by EIS analysis. The unusual decrease of SEI resistance and the increase of chemical diffusion coefficient in the several initial cycles were explained in terms of the transformation from crystalline to amorphous state of the electrode material.

Key words: electrochemistry, anode materials, molten nitrates method, electrochemical impedance spectroscopy

中图分类号: 

  • O469