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Free-standing and bendable carbon nanotubes/TiO2 nanofibres composite electrodes for flexible lithium ion batteries

机译:柔性锂离子电池的可自由弯曲的碳纳米管/ TiO2纳米纤维复合电极

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摘要

Carbon nanotube (CNT) and TiO2 nanofibre 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 TiO2 nanofibres were well-dispersed and interwoven by the CNTs, forming freestanding, bendable and light weighted composite. In comparison with TiO2 nanofibre based LIBs, the CNTs could significantly improve the battery performance due to their high conductivity property and 3D network morphology. In both 1-3 V and 0.01-3 V testing voltage ranges, the as-prepared composites show excellent reversible capacity and capacity retention. The superior lithium storage capacity of the CNT/TiO2 composite 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 TiO2 active materials by preventing agglomeration of TiO2 nanofibres. This work demonstrates that the CNT-TiO2 composite film could be one type of potential electrode material for large-scale LIB applications.
机译:制备了碳纳米管(CNT)和TiO2纳米纤维复合膜,并将其用作锂离子电池(LIB)的负极材料,而无需使用粘合剂和常规的铜集电器。 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,TiO2纳米纤维被CNT很好地分散和交织,形成了独立的,可弯曲的和轻量的复合材料。与基于TiO2纳米纤维的LIB相比,CNT具有高导电性和3D网络形态,可显着改善电池性能。在1-3 V和0.01-3 V测试电压范围内,所制备的复合材料均具有出色的可逆容量和容量保持率。 CNT / TiO2复合材料优异的锂存储能力主要归因于CNT的双重功能-CNT不仅提供导电网络以协助电子转移,而且通过防止团聚促进锂离子在电解质和TiO2活性材料之间扩散TiO2纳米纤维。这项工作证明了CNT-TiO2复合膜可能是用于大规模LIB应用的一种潜在的电极材料。

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