Electrochemical impedance study of Li-ion insertion into mesocarbon microbead single particle electrode Part II. Disordered carbon

被引:96
作者
Dokko, K
Fujita, Y
Mohamedi, M
Umeda, M
Uchida, I
Selman, JR
机构
[1] Tohoku Univ, Dept Appl Chem, Grad Sch Engn, Aoba Ku, Sendai, Miyagi 9808579, Japan
[2] IIT, Dept Environm Chem & Engn, Ctr Electrochem Sci & Engn, Chicago, IL 60616 USA
基金
日本学术振兴会;
关键词
single particle; microelectrode; disordered carbon; lithium batteries; solid electrolyte interphase;
D O I
10.1016/S0013-4686(01)00809-X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Electrochemical impedance spectroscopy (EIS) was applied for a single mesocarbon microbead (heat-treated at 1000 degreesC) of 30 mum diameter during Li-ion insertion and extraction using a stainless tip-microelectrode in the electrolyte of 1 M LiClO4/propylene carbonate + ethylene carbonate. Obtained spectra were analyzed with an equivalent circuit model. Kinetic parameters such as the charge transfer resistance, and the apparent chemical diffusion coefficient of Li-ion in the particle were evaluated without interference of organic binders, The charge transfer resistance decreased and chemical diffusion coefficient of Li-ion increased as the electrode potential was made more negative. The chemical diffusion coefficient varied within 10(-12)-10(-6) cm(2) s(-1). (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:933 / 938
页数:6
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