Effect of proton irradiation on anatase TiO2 nanotube anodes for lithium-ion batteries
Effect of proton irradiation on anatase TiO2 nanotube anodes for lithium-ion batteries
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DOI：
10.1007/s10853-019-03825-w
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发表时间：
2019-10
影响因子：
4.5
通讯作者：
Kassiopeia A. Smith;A. Savva;Keyou S. Mao;Yongqiang Wang;D. Tenne;Di Chen;Yuzi Liu;Pete Barnes
中科院分区：
文献类型：
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作者：
Kassiopeia A. Smith;A. Savva;Keyou S. Mao;Yongqiang Wang;D. Tenne;Di Chen;Yuzi Liu;Pete Barnes
缺陷在锂离子电池电极材料电荷传递和传输性能中的作用最近引起了越来越多的关注。人们普遍认为，离子辐照促进了晶体固体中缺陷的形成。在用于辐照的所有离子物种中，质子预计主要会产生简单的Frenkel对点缺陷，而不会显著改变目标材料受损区域的化学计量比。研究了不同温度的质子辐照对锂离子电池用锐钛矿型二氧化钛纳米管(TiO2NT)电极电化学性能的影响。将锐钛矿型二氧化钛纳米管在室温(25℃)和250℃下进行辐照，并与未辐照的对照样品进行比较。拉曼光谱和X射线衍射仪的表征表明，两种温度下的辐照并没有改变纳米管的长程有序性。然而，高分辨透射电子显微镜显示，辐照后形成缺陷团簇，并且随着温度的升高，缺陷团簇的尺寸增大。与未辐照的对照相比，辐照后的样品都表现出更大的容量和更高的倍率能力，这可以通过增加存储位置以及由于辐照诱导缺陷的存在而改善Li+的扩散系数来解释。这项研究提出了一种独特的视角，通过定制辐照条件来设计功能纳米结构电极材料的途径。
The role of defects in the charge transfer and transport properties of electrode materials for lithium-ion batteries has recently garnered increased interest. It is widely recognized that ion irradiation promotes the formation of defects within a crystalline solid. Among all ion species used for irradiation, protons are expected to create primarily simple Frenkel pair point defects without significantly changing the stoichiometry of the damaged region of the target material. This work investigates the effect of proton irradiation at varying temperatures on the electrochemical properties of anatase TiO2nanotube (TiO2-NT) electrode for lithium-ion battery applications. Anatase TiO2-NTs are irradiated at both room temperature (25 °C) and 250 °C and compared with non-irradiated control specimens. Characterization by Raman spectroscopy and XRD suggests that the irradiation at both temperatures does not alter the long-range order of the nanotubes. However, high-resolution TEM reveals that defect clusters are formed upon irradiation and increase in size with increasing temperature. Both irradiated samples exhibit increased capacity and enhanced rate capability compared with the non-irradiated control, which can be explained by increased storage sites as well as improved Li+diffusivity due to the presence of irradiation-induced defects. This study presents a unique perspective on pathways to engineer functional nanostructured electrode materials by tailoring irradiation conditions.