Fast lithium-ion insertion of TiO2 nanotube and graphene composites
Fast lithium-ion insertion of TiO2 nanotube and graphene composites
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TiO2 纳米管和石墨烯复合材料的快速锂离子嵌入
DOI：
10.1016/j.electacta.2012.10.010
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发表时间：
2013-01
影响因子：
6.6
通讯作者：
Zongping Shao
中科院分区：
文献类型：
--
作者：
Jie Wang;Yingke Zhou;Bin Xiong;Yuanyuan Zhao;Xiaojian Huang;Zongping Shao
尽管锂离子电池在便携式电子产品中得到了显著的发展和广泛的应用，但开发性能优越的电极材料以应对电动汽车大规模应用的挑战是非常必要的。本文报道了一步水热法制备的二氧化钛纳米管/石墨烯复合材料的电化学嵌锂性能。用X射线衍射仪、红外光谱、拉曼光谱、X射线光电子能谱、透射电子显微镜和场发射扫描电子显微镜对产物的结构和形貌进行了分析。采用循环伏安法、恒流充放电测试和电化学阻抗技术对其电化学性质进行了研究。作为锂离子电池的负极，新型复合材料表现出优异的电化学性能和优异的倍率性能，具有高的锂存储容量(357 mAhg−1，10 mAg−1的倍率，超过了336 mAhg−1的理论容量)。二氧化钛纳米管/石墨烯复合材料50次循环后的倍率为150mAhg−1(4000mAg−1)，2000次循环后为80mAhg−1(8000mAg−1)，库仑效率约为99.5%，表现出良好的循环稳定性和可逆性。这些纳米管/石墨烯复合材料具有优异的储锂和高倍率性能，这主要归功于两者之间的协同效应和相互作用，即两者之间的“形态”和“电子”相互作用，这种类型的石墨烯和纳米管复合材料有望成为设计未来具有高电化学性能的石墨烯电极材料的良好范例，以及在电动汽车和混合动力汽车的先进动力电池中的应用。
Though there have been remarkable growth and widespread application of Li-ion batteries in portable electronics, it is highly desirable to develop the electrode materials with superior performance to meet the challenges of emerging large scale applications in electric vehicles. Here we report the electrochemical lithium insertion performance of TiO2nanotube/graphene composites, which have been designed and effectively prepared by a one-step hydrothermal method. The structure and morphology of the products were analyzed by X-ray diffraction, FT-IR spectra, Raman spectra, X-ray photoelectron spectroscopy, transmission electron microscopy and field-emission scanning electron microscopy. The electrochemical properties were investigated by cyclic voltammetry, constant current discharge–charge tests, and electrochemical impedance techniques. Employed as an anode in a lithium-ion battery, the novel composites presented excellent electrochemical performance with high Li storage capacity (357mAhg−1at the rate of 10mAg−1, exceeding the theoretical capacity value 336mAhg−1of TiO2) and excellent rate performance. The TiO2nanotube/graphene composite exhibited excellent rate capacities of 150mAhg−1(at the rate of 4000mAg−1) after 50 cycles and 80mAhg−1(at the rate of 8000mAg−1) after 2000 cycles; the coulombic efficiency was approximately 99.5%, indicating excellent cycling stability and reversibility. The remarkable Li storage and high-rate capabilities of these nanotube/graphene composites were mainly attributed to the synergetic and interactive effects, namely, the “morphology” and “electronic” interactions of both components, and such kinds of graphene and nanotube composites held great promise as good example for designing future graphene based electrode materials with high electrochemical performances, as well as applications in advanced power batteries of EV and HEV.
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影响因子：
4.9
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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通讯作者：
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影响因子：
17.1
作者：
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通讯作者：
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