Electrochemical impedance study of Li-ion insertion into the raw acid-oxidized carbon nanotubes

被引：3
|
作者：
Yang, ZH [1 ]
Sang, SB
Feng, Y
Zhou, YH
Huang, KL
Wu, HQ
机构：
[1] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China
[2] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2005年 / 14卷 / 08期
关键词：
carbon nanotubes; lithium batteries; impedance; oxidation; resistance; diffusion coefficient;
D O I：
10.1016/j.diamond.2004.12.045
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electrochemical impedance spectroscopy (EIS) was applied for the raw acid-oxidized multiwall carbon nanotubes during Li-ion insertion with the electrolyte of 1M LiPF(6) in EC and DMC. Impedance spectroscopy consists of two separated arcs in the high and intermediate range frequency. The high frequency arc is attributed to Li migration within the surface films and the medium frequency arc is associated with the charge transfer. Obtained spectra were analyzed with an equivalent circuit model. Kinetic parameters such as the charge transfer resistance, film resistance, diffusion coefficient and exchange current were evaluated. The contribution of the film to the measured impedance response is discussed. (c) 2005 Published by Elsevier B.V.
引用
收藏
页码：1302 / 1310
页数：9
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