Carbon-Coated Anatase TiO2 Nanotubes for Li- and Na-Ion Anodes
Carbon-Coated Anatase TiO2 Nanotubes for Li- and Na-Ion Anodes
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DOI：
10.1149/2.0031502jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Passerini, Stefano
中科院分区：
文献类型：
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作者：
Bresser, Dominic;Oschmann, Bernd;Passerini, Stefano
以钛酸盐纳米管为原料，通过接枝聚丙烯腈基嵌段共聚物，制备了碳包覆的二氧化钛纳米管。如通过高分辨率透射电子显微镜（HRTEM）和电子能量损失谱（EELS）所揭示的，这种方法导致非常均匀和薄的碳涂层，这对于那些在离子插入（脱插入）时不经历显著体积变化的存储锂的活性材料是有利的。事实上，由此制备的碳包覆的TiO 2纳米管呈现出超过500次循环的优异的长期循环稳定性（每循环0.02%容量衰减）和非常有前途的高倍率性能（在10 C和15 C下分别约为130和110 mAh g（-1））。通过比较碳包覆纳米管和纳米棒，简要讨论了管状形貌对速率性能的影响。最后，还研究了碳涂覆的纳米管作为钠离子阳极材料，在C/10、1 C和2 C下分别显示出约170、120和100 mAh g（-1）的非常有前途的可逆容量，使其成为锂离子和钠离子应用的通用阳极材料（C）作者（s）2014。由ECS发布。All rights reserved.
Carbon-coated, anatase titanium dioxide nanotubes were prepared by carbonizing a polyacrylonitrile-based block copolymer grafted on the as-synthesized titanate nanotubes. As revealed by high resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS), this approach results in a very homogeneous and thin carbon coating, which is advantageous for those active materials storing lithium without undergoing significant volume changes upon ion (de-)insertion. As a matter of fact, thus prepared carbon-coated TiO2 nanotubes presented an excellent long-term cycling stability for more than 500 cycles (0.02% capacity fading per cycle) and a very promising high rate performance (about 130 and 110 mAh g(-1) at 10 C and 15 C, respectively). The influence of the tubular morphology on the rate performance is briefly discussed by comparing carbon-coated nanotubes and nanorods. Finally, the carbon-coated nanotubes were also investigated as sodium-ion anode material, showing very promising reversible capacities of around 170, 120, and 100 mAh g(-1) at C/10, 1 C, and 2 C, respectively, rendering them as versatile anode material for lithium-and sodium-ion applications (C) The Author(s) 2014. Published by ECS. All rights reserved.