Free-standing and bendable carbon nanotubes/TiO2 nanofibres composite electrodes for flexible lithium ion batteries
Free-standing and bendable carbon nanotubes/TiO2 nanofibres composite electrodes for flexible lithium ion batteries
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DOI：
10.1016/j.electacta.2013.04.089
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发表时间：
2013-08
影响因子：
6.6
通讯作者：
Peng Zhang;Jingxia Qiu;Zhanfeng Zheng;Gao Liu;M. Ling;W. Martens;Haihui Wang;Huijun Zhao;
中科院分区：
文献类型：
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作者：
Peng Zhang;Jingxia Qiu;Zhanfeng Zheng;Gao Liu;M. Ling;W. Martens;Haihui Wang;Huijun Zhao;
制备了碳纳米管（CNT）和TiO 2纳米纤维复合膜，并将其用作锂离子电池（LIB）的负极材料，而不使用粘合剂和常规的铜集流体。X射线衍射、扫描电子显微镜和透射电子显微镜的初步实验结果表明，TiO 2纳米纤维在碳纳米管中分散良好，并与碳纳米管相互交织，形成了独立的、可弯曲的轻质复合材料。与基于TiO 2纳米纤维的锂离子电池相比，碳纳米管由于其高导电性和三维网络形态，可以显著提高电池性能。在1-3V和0.01-3V的测试电压范围内，所制备的复合材料显示出优异的可逆容量和容量保持率。CNT/TiO 2复合材料的上级储锂能力主要归因于CNT的双重功能-CNT不仅提供导电网络以帮助电子转移，而且通过防止TiO 2纳米纤维的团聚而促进锂离子在电解质和TiO 2活性材料之间的扩散。这一工作表明，碳纳米管-二氧化钛复合薄膜可能是一种潜在的电极材料，为大规模的锂离子电池的应用。
Carbon nanotube (CNT) and TiO2nanofibre composite films are prepared and used as anode materials for lithium ion batteries (LIBs) without the use of binders and conventional copper current collector. The preliminary experimental results from X-ray diffraction, scanning electron microscopy and transmission electron microscopy suggest that the TiO2nanofibres were well-dispersed and interwoven by the CNTs, forming freestanding, bendable and light weighted composite. In comparison with TiO2nanofibre based LIBs, the CNTs could significantly improve the battery performance due to their high conductivity property and 3D network morphology. In both 1–3V and 0.01–3V testing voltage ranges, the as-prepared composites show excellent reversible capacity and capacity retention. The superior lithium storage capacity of the CNT/TiO2composite was mainly attributed to dual functions of the CNTs – the CNTs not only provide conductive networks to assist the electron transfer but also facilitate lithium ion diffusion between the electrolyte and the TiO2active materials by preventing agglomeration of TiO2nanofibres. This work demonstrates that the CNT–TiO2composite film could be one type of potential electrode material for large-scale LIB applications.