Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 4    April 2010

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Electrochemical performance of carbon nanotube-modified LiFePO4 cathodes for Li-ion batteries
CHEN Zhao-yong(陈召勇), ZHU Hua-li(朱华丽), ZHU Wei(朱 伟),
ZHANG Jian-li(张建利), LI Qi-feng(李奇峰)

College of Physics and Electronic Science, Changsha University of Science and Technology,
Changsha 410114, China

Abstract:Carbon nanotubes (CNTs) and acetylene black (AB) were dispersed synchronously or separately between LiFePO4 (LFP) particles as conducting agents during the course of manufacture of LiFePO4 cathodes. The morphology and electrochemical performances of as-prepared LiFePO4 were evaluated by means of transmission electron microscopy (TEM), charge-discharge test, electrochemical impedance spectroscope (EIS) and cyclic voltammetry (CV). CNTs contribute to the interconnection of the isolated LiFePO4 or carbon particles. For the CNTs-modified LiFePO4, it exhibits excellent performance in terms of both specific capacity and cycle life. The initial discharge capacity is 147.9 mA∙h/g at 0.2C rate and 134.2 mA∙h/g at 1C rate, keeping a capacity retention ratio of 97% after 50 cycles. The results from EIS indicate that the impedance value of the solid electrolyte interface decreases. The cyclic voltammetric peak profiles is more symmetric and spiculate and there are fewer peaks. CNTs are promising conductive additives candidate for high-power Li-ion batteries.

 

Key words: LiFePO4; carbon nanotubes; cyclic voltammetry (CV); electrochemical impedance spectroscopy (EIS); Li-ion batteries

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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