期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 20, 期 4, 页码 614-618出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(09)60187-4
关键词
LiFePO4; carbon nanotubes; cyclic voltammetry (CV); electrochemical impedance spectroscopy (EIS); Li-ion batteries
资金
- Hunan Provincial Education Department of China [06B002]
- Hunan Provincial Natural Science Foundation of China [09JJ3092]
- Planned Science and Technology Project of Hunan Province of China [2008FJ3008]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据