A comparative study of electrochemical properties of two kinds of carbon nanotubes as anode materials for lithium ion batteries
A comparative study of electrochemical properties of two kinds of carbon nanotubes as anode materials for lithium ion batteries
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两种碳纳米管作为锂离子电池负极材料的电化学性能对比研究
DOI：
10.1016/j.electacta.2007.09.040
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发表时间：
2008
影响因子：
6.6
通讯作者：
中科院分区：
文献类型：
--
作者：
采用透射电子显微镜、高分辨电子显微镜和多种电化学测试技术对共热解法制备的短碳纳米管(CNTS-1)和普通化学气相沉积法制备的长碳纳米管(CNTS-2)作为锂离子电池负极材料进行了对比研究。测试结果表明，在0.2mAcm−2和0.8mAcm−2电流密度下，碳纳米管-1电极的可逆容量分别为266mAhg和170mAhg-1，几乎是碳纳米管-2电极的两倍。碳纳米管-2电极存在较大的电压滞后，这不仅与碳纳米管表面的官能团有关，还与碳纳米管的表面电阻有关，导致碳纳米管从电极中提取锂时的阻力较大，过电压较高。通过交流阻抗测量，比较了两种碳纳米管电极的动力学特性。结果表明，碳纳米管1的表面膜电阻和电荷转移电阻均显著低于碳纳米管2，两种碳纳米管电极的锂扩散系数均随电压的降低而减小，但锂扩散系数的变化幅度小于碳纳米管2电极，表明碳纳米管1在充放电过程中表现出更高的电化学活性和更好的动力学性能。
Two kinds of carbon nanotubes (CNTs), i.e., short carbon nanotubes (CNTs-1) synthesized by co-pyrolysis method and long carbon nanotubes (CNTs-2) produced using common CVD technique were comparatively investigated as anode materials for lithium ion batteries via transmission electron microscope (TEM), high-resolution TEM and a variety of electrochemical testing techniques. The test results showed that the reversible capacities of CNTs-1 electrode were 266 and 170mAhg−1at the current densities of 0.2 and 0.8mAcm−2, respectively, which were almost twice those of CNTs-2 electrode. The larger voltage hysteresis in CNTs-2 electrode was not only related to the surface functional groups on CNTs, but also to the surface resistance of CNTs, which results in greater hindrance and higher overvoltage during lithium extraction from electrode. The kinetics properties of these two CNTs electrodes were compared by AC impedance measurements. It was found that, both the surface film and charge-transfer resistances of CNTs-1 were significantly lower than those of CNTs-2; the lithium diffusion coefficient (DLi) of both CNTs electrodes decreased as the drop of voltage, but the magnitude of the DLivariation of CNTs-1 electrode was smaller than that of CNTs-2 electrode, indicating CNTs-1 exhibited higher electrochemical activity and more favorable kinetic properties during charge and discharge process.
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影响因子：
6.6
作者：
Yulong Wu;Changyin Jiang;C. Wan;R. Holze
通讯作者：
Yulong Wu;Changyin Jiang;C. Wan;R. Holze
影响因子：
3
作者：
Zhan-hong Yang;Zai-Jun Li;Hao-qing Wu;B. Simard
通讯作者：
Zhan-hong Yang;Zai-Jun Li;Hao-qing Wu;B. Simard
影响因子：
2.8
作者：
H. Shimoda;B. Gao;X. Tang;A. Kleinhammes;L. Fleming;Yue Wu;O. Zhou
通讯作者：
H. Shimoda;B. Gao;X. Tang;A. Kleinhammes;L. Fleming;Yue Wu;O. Zhou
影响因子：
3.3
作者：
A. Cassell;J. Raymakers;J. Kong;H. Dai
通讯作者：
A. Cassell;J. Raymakers;J. Kong;H. Dai
影响因子：
64.8
作者：
Lee, RS;Kim, HJ;Smalley, RE
通讯作者：
Smalley, RE