Construction of sheet-belt hybrid nanostructures from one-dimensional mesoporous TiO2(B) nanobelts and graphene sheets for advanced lithium-ion batteries
Construction of sheet-belt hybrid nanostructures from one-dimensional mesoporous TiO2(B) nanobelts and graphene sheets for advanced lithium-ion batteries
复制标题
用于先进锂离子电池的一维介孔TiO2(B)纳米带和石墨烯片构建片带混合纳米结构
DOI：
10.1039/c2ta00593j
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Zhang, Wenkui
中科院分区：
文献类型：
--
作者：
Huang, Hui;Fang, Junwu;Zhang, Wenkui
TiO2(B)因其特有的赝电容储能机制而被认为是一种新型负极材料，可替代石墨用于高功率锂离子电池（LIB）。在此，我们首次报道了通过在 NaOH 介质中水热处理商业 TiO2 (P25) 粉末来合成一维 (1D) 介孔 TiO2(B) 纳米带。所制备的 TiO2(B) 纳米带的典型尺寸为宽度 50-100 nm，长度为几微米，介孔通道在 10-30 nm 范围内。此外，我们展示了使用石墨烯作为优异的微型集电器来原位构建独特的混合片带纳米结构（G-TiO2（B））以优化性能。这种一维介孔TiO2(B)结构可以为电解质提供大量开放通道，以促进锂离子的超快扩散。此外，引入的石墨烯层既有利于电极中电子的快速传输，又对比容量做出巨大贡献。因此，这种G-TiO2(B)混合物可以提供超高的可逆容量（在0.15 A g(-1)的低电流密度下超过430 mAh g(-1)），并表现出卓越的倍率性能（3 A g(-1)时为210 mAh g(-1)）。
TiO2(B) is considered as a new kind of anode material, and an alternative to graphite, for high-power lithium ion batteries (LIBs) due to its characteristic pseudocapacitive energy storage mechanism. Herein, we firstly report the synthesis of one-dimensional (1D) mesoporous TiO2(B) nanobelts by hydrothermal treatment of commercial TiO2 (P25) powders in NaOH medium. The as-prepared TiO2(B) nanobelts, with typical sizes of 50-100 nm in width and several micrometers in length, have mesopore channels in the range of 10-30 nm. Moreover, we demonstrate the use of graphene as an excellent mini-current collector to in situ construct unique hybrid sheet-belt nanostructures (G-TiO2(B)) to optimize the performance. Such a 1D mesoporous TiO2(B) structure can provide numerous open channels for the electrolyte to access and facilitate the ultrafast diffusion of lithium ions. In addition, the introduced graphene layers will both be favorable for the fast electron transport in the electrode and make a great contribution to the specific capacity. As a consequence, this G-TiO2(B) hybrid can deliver an ultrahigh reversible capacity (over 430 mA h g(-1) at a low current density of 0.15 A g(-1)), and present a superior rate capability (210 mA h g(-1) at 3 A g(-1)).