Highly Ordered Three-Dimensional Ni-TiO2 Nanoarrays as Sodium Ion Battery Anodes

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• 作者：Yang Xu ; Min Zhou ; Liaoyong Wen ; Chengliang Wang ; Huaping Zhao ; Yan Mi ; Liying Liang ; Qun Fu ; Minghong Wu ; Yong Lei
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：27
• 期：12
• 页码：4274-4280
• 全文大小：457K
• ISSN：1520-5002

文摘

Sodium ion batteries (SIBs) represent an effective energy storage technology with potentially lower material costs than lithium ion batteries. Here, we show that the electrochemical performance of SIBs, especially rate capability, is intimately connected to the electrode design at the nanoscale by taking anatase TiO₂ as an example. Highly ordered three-dimensional (3D) Ni-TiO₂ core鈥搒hell nanoarrays were fabricated using nanoimprited AAO templating technique and directly used as anode. The nanoarrays delivered a reversible capacity of 鈭?00 mAh g^鈥? after 100 cycles at the current density of 50 mAh g^鈥? and were able to retain a capacity of 鈭?5 mAh g^鈥? at the current density as high as 5 A g^鈥? and fully recover low rate capacity. High ion accessibility, fast electron transport, and excellent electrode integrity were shown as great merits to obtain the presented electrochemical performance. Our work demonstrates the possibility of highly ordered 3D heterostructured nanoarrays as a promising electrode design for Na energy storage to alleviate the reliance on the materials鈥?intrinsic nature and provides a versatile and cost-effective technique for the fabrication of such perfectly ordered nanostructures.