Nanocrystalline Li4Ti5O12-coated TiO2 nanotube arrays as three-dimensional anode for lithium-ion batteries
Nanocrystalline Li4Ti5O12-coated TiO2 nanotube arrays as three-dimensional anode for lithium-ion batteries
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纳米晶Li4Ti5O12涂层TiO2纳米管阵列作为锂离子电池三维阳极
DOI：
10.1016/j.electacta.2013.11.095
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发表时间：
2014-01
影响因子：
6.6
通讯作者：
Guoqu Zheng
中科院分区：
文献类型：
--
作者：
Yiping Tang;Xiao Xu;Guangya Hou;Guoqu Zheng
采用阳极氧化法和溶胶-凝胶法制备了一种新型的纳米复合材料Li 4 Ti 5 O 12/TiO 2纳米管阵列（Li 4 Ti 5 O 12/TNTA），作为锂离子电池的三维（3D）负极材料。Li 4 Ti 5 O 12/TNTA复合材料保持了良好的三维纳米管结构，并通过简单、无模板、低温等工艺在TNTA表面形成了纯的纳米晶Li 4 Ti 5 O 12。采用掠射角X射线衍射（GAXRD）、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）研究了样品的形貌和微观结构。此外，通过充放电测试和电化学阻抗谱（EIS）进一步评价了材料的电化学性能，并对纳米晶Li 4 Ti 5 O 12的形成机理进行了探讨。结果表明，新相Li 4 Ti 5 O 12的存在，使多孔陶瓷中的金红石和金红石相分离，并通过空间位阻效应严重阻碍了金红石向金红石的相变，同时纳米晶Li 4 Ti 5 O 12涂层与TNTA的结合牢固，提高了多孔管状结构的稳定性。Li 4 Ti 5 O 12/TNTA阳极的电化学性能优于TNTA。Li 4 Ti 5 O 12/TNTA阳极在10 μA cm−2的电流密度下的面容量为400.9 μAh cm− 2，经过50次不同的电流密度循环后，其保持175.8 μAh cm−2，几乎是TNTA 63.9 μAh cm−2的三倍。
A novel nanocomposite of crystalline Li4Ti5O12-coated TiO2nanotube arrays (Li4Ti5O12/TNTA) was synthesized by anodic oxidation and sol-gel method as three-dimensional (3D) anode for Li-ion batteries. The 3D nanotubular structure was well retained in Li4Ti5O12/TNTA, and the pure and nanocrystalline Li4Ti5O12formed on the surface of TNTA by the simple, template-free and low-temperature process. The morphology and microstructure of the samples were investigated by glancing angle X-ray diffraction (GAXRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). In addition, the electrochemical performance was further evaluated by charge-discharge measurements and electrochemical impedance spectroscopy (EIS), and the formation mechanism of nanocrystalline of Li4Ti5O12was discussed. The results showed that the new phase Li4Ti5O12separated the phases of anatase and rutile, and hindered the phase transformation of anatase to rutile severely due to the steric hindrance effect, moreover nanocrystalline Li4Ti5O12coating bonded TNTA firmly and improved the stability of the porous tubular structure. Li4Ti5O12/TNTA anode with the novel nanostructure exhibited higher electrochemical performance than that of TNTA. The areal capacity of Li4Ti5O12/TNTA anode is 400.9 μAh cm−2at the current density of 10 μA cm−2, after 50 cycles of different current density it retains 175.8 μAh cm−2, which is almost tripled of TNTA 63.9 μAh cm−2.
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影响因子：
16.6
作者：
Wang, Yonggang;Wang, Yarong;Zhou, Haoshen
通讯作者：
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影响因子：
9.2
作者：
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影响因子：
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作者：
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影响因子：
6.6
作者：
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通讯作者：
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8.6
作者：
Ortiz, Gregorio F.;Hanzu, Ilie;Knauth, Philippe
通讯作者：
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