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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Pseudocapacitive Lithium-Ion Storage in Oriented Anatase TiO2 Nanotube Arrays
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Pseudocapacitive Lithium-Ion Storage in Oriented Anatase TiO2 Nanotube Arrays

机译：定向锐钛矿型TiO2纳米管阵列中的伪电容锂离子存储

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摘要

We report on the synthesis and electrochemical properties of oriented anatase TiO2 nanotube (NT) arrays as electrodes for Li-ion batteries. The TiO2 NT electrodes displayed both pseudocapacitive Li~+ storage associated with the NT surface and the Li~+ storage within the bulk material. The relative contribution of the pseudocapacitive and bulk storages depends strongly on the scan rate. While the charges are stored primarily in the bulk at low scan rates ( 1 mV/s), the surface storage dominates the total storage capacity at higher scan rates (>1 mV/s). The storage capacity of the NT electrodes as a function of charge/discharge rates showed nodependence on the NT film thickness, suggesting that the Li~+ insertion/extraction processes occur homogeneously across the entire length of NT arrays. These results indicated that the electron conduction along the NT walls and the ion conduction within the electrolyte do not cause significant hindering of the charge/discharge kinetics for NT electrode architectures. As a result of the surface pseudocapacitive storage, the reversible Li~+ storage capacities for TiO2 NT electrodes were higher than the theoretical storage capacity for bulk anatase TiO2 materials.
机译：我们报道了定向锐钛矿型TiO2纳米管（NT）阵列作为锂离子电池电极的合成和电化学性能。 TiO2 NT电极既显示与NT表面相关的假电容Li +储存，又显示块状材料内的Li +储存。伪电容存储和大容量存储的相对贡献在很大程度上取决于扫描速率。电荷主要以低扫描速率（ 1 mV / s）散装存储，而表面存储则以较高扫描速率（> 1 mV / s）占总存储容量。 NT电极的存储容量随充电/放电速率的变化而变化，与NT膜厚度无关，这表明Li〜+插入/提取过程在NT阵列的整个长度上均匀发生。这些结果表明，沿着NT壁的电子传导和电解质中的离子传导不会对NT电极结构产生明显的充电/放电动力学阻碍。表面假电容存储的结果是，TiO2 NT电极的可逆Li〜+存储容量高于块状锐钛矿型TiO2材料的理论存储容量。

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