Effect of carbon nanotube on the electrochemical performance of C-LiFePO4/graphite battery
Effect of carbon nanotube on the electrochemical performance of C-LiFePO4/graphite battery
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DOI：
10.1016/j.jpowsour.2008.03.017
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发表时间：
2008-10-01
影响因子：
9.2
通讯作者：
Liang, Rufu
中科院分区：
文献类型：
--
作者：
Liu, Yunjian;Li, Xinhai;Liang, Rufu
本文介绍了碳纳米管（CNT）和炭黑（CB）两种不同导电碳添加剂对C-LiFePO4/石墨电池的制备和性能测试。研究了该电池的放电容量、倍率容量和循环性能。与添加碳纳米管的电池相比，添加碳纳米管的电池表现出更好的电化学性能，循环50次后容量保持率为99.2%，0.1℃和1℃下的放电容量之比为94.6%。用循环伏安图和交流阻抗分析了电化学性能差异的原因。结果表明，加入碳纳米管后，极化电压从0.3 V降低到0.2 V，阻抗从423.2 ω降低到36.88 ω。利用XRD对循环后活性物质的结构进行了表征。在添加碳纳米管的活性材料中，LiFePO4的晶体保持性能较好。(C) 2008 Elsevier B.V.版权所有
This paper describes the fabrication and testing of C-LiFePO4/graphite battery with different conductive carbon additives: carbon nanotube (CNT) or carbon black (CB). The discharge capacity, rate capability and cyclic performance of the battery were investigated. Compared with the batteries with CB additive, those with CNT additive show better electrochemical performances with capacity retention ratio of 99.2% after 50 cycles, and the ratio of discharge capacity at 0.1 C rate to that at 1 C rate is 94.6%. The reason for the difference in electrochemical property was studied with cyclic voltammagrams and AC impedance. It was found that, with CNT additive, the polarization voltage was decreased from 0.3 to 0.2 V, and the impedance was decreased from 423.2 to 36.88 Omega. The structures of active materials after cycling were characterized using XRD. The better crystal retaining of LiFePO4 was found in the active materials with CNT added. (C) 2008 Elsevier B.V. All rights reserved.