Influence of crystal phase on TiO2 nanowire anodes in sodium ion batteries
Influence of crystal phase on TiO2 nanowire anodes in sodium ion batteries
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晶相对钠离子电池TiO2纳米线负极的影响
DOI：
10.1039/c7ta05852g
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发表时间：
2017-10-07
影响因子：
11.9
通讯作者：
Liu, Lijia
中科院分区：
文献类型：
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作者：
Liu, Yi;Zhao, Feipeng;Liu, Lijia
纳米结构的二氧化钛是一种很有前途的钠离子电池负极材料。在这项工作中，我们对用于此目的的锐钛矿型和B相二氧化钛纳米线进行了对比研究。除了标准的表征方法外，我们还采用了X射线吸收光谱和密度泛函理论，结果表明钠离子可嵌入锐钛矿型和B相纳米线中，并且两者的可逆（脱）钠容量几乎相同。然而，基于锐钛矿的钠离子电池的长期稳定性比基于B相的钠离子电池差。我们认为这是由于在表面附近不可逆地形成了NaxTiO2，阻碍了钠离子的扩散。因此，使用TiO2(B)负极并选择具有粗糙表面的纳米结构几何形状，限制表面阻挡层的不良阻挡能力，可能会提高钠离子电池的性能。
Nanostructured TiO2 is a promising anode material for Na-ion batteries. In this work, we present a comparative study of anatase and B-phase TiO2 nanowires used for this purpose. We employ X-ray absorption spectroscopy and density functional theory in addition to standard characterization methods to reveal that Na is inserted into both anatase and B-phase nanowires, and that the reversible (de)sodiation capacity is almost the same for both. However the long-term stability of anatase-based Na-ion batteries is poorer than B-phase-based Na-ion batteries. We propose this is due to the irreversible formation of NaxTiO2 near the surface, which blocks Na diffusion. Improved Na-ion battery performance may therefore be obtained using TiO2(B) anodes and by choosing nanostructure geometries with rough surfaces, limiting the unwanted blocking ability of surface barrier layers.