Comparative Study on the Morphology-Dependent Performance of Various CuO Nanostructures as Anode Materials for Sodium-Ion Batteries
Comparative Study on the Morphology-Dependent Performance of Various CuO Nanostructures as Anode Materials for Sodium-Ion Batteries
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DOI：
10.1021/acssuschemeng.8b02159
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发表时间：
2018-08-01
影响因子：
8.4
通讯作者：
Kao, Hsien-Ming
中科院分区：
文献类型：
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作者：
Rath, Purna Chandra;Patra, Jagabandhu;Kao, Hsien-Ming
本工作基于不同的结构导向剂，采用简单、环保的水热方法，成功地合成了具有三种不同纳米结构的CuO样品，即纳米薄片、纳米椭球和纳米棒。对比研究了不同结构的纳米CuO对钠离子电池正极电化学性能的影响，如容量、循环稳定性、倍率性能和扩散系数测量等。与CuO纳米椭球(CuO-NES)和CuO纳米薄片(CuO-NR)相比，CuO纳米棒(CuO-NRS)电极的容量和循环稳定性更高。在25 mA g(-1)的低电流密度下，CuO-NRS基电极表现出600 mA h的优良的可逆容量，150次循环后的容量为206 mA h g(-1)，容量保持率为73%，即使在1000 mA g(-1)的高电流密度下也是如此。CuO-NRS的优异性能归功于其细长的纳米棒形态和较小的颗粒尺寸，提供了较短的扩散路径和最大的表面积，促进了在电解液中的良好扩散，确保了良好的电子导电性和循环稳定性。对这些材料的比较分析可以为设计具有不同形貌的层次化纳米结构以获得更好的钠离子电池材料提供有价值的见解。
In this work, CuO samples with three different nanostructures, i.e., nanoflakes, nanoellipsoids, and nanorods, are successfully synthesized by a facile and environmentally friendly hydrothermal approach based on the use of different structure directing agents. The morphological influence on the anodic electrochemical performances, such as capacity, cycling stability, rate capability, and diffusion coefficient measurements of these different CuO nanostructures is comparatively investigated for sodium-ion batteries. The capacity and cycling stability are higher for the CuO nanorods (CuO-NRs) based electrode as compared to the cases of CuO nanoellipsoids (CuO-NEs) and CuO nanoflakes (CuO-NR). At a low current density of 25 mA g(-1), the CuO-NRs based electrode exhibits an excellent reversible capacity of 600 mA h It also exhibits a capacity of 206 mA h g(-1) after 150 cycles with a capacity retention of 73% even at a higher current density of 1000 mA g(-1). The exceptional performance of CuO-NRs is attributable to its slim nanorod morphology with a smaller particle size that provides a short diffusion path and the maximized surface area facilitating good diffusion in electrolytes, ensuring good electronic conductivity and cycling stability. The comparative analysis of these materials can provide valuable insights to design hierarchical nanostructures with distinct morphology to achieve better materials designed for sodium-ion batteries.