Aligned Titania Nanotubes as an Intercalation Anode Material for Hybrid Electrochemical Energy Storage
Aligned Titania Nanotubes as an Intercalation Anode Material for Hybrid Electrochemical Energy Storage
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DOI：
10.1002/adfm.200800635
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发表时间：
2008-12
影响因子：
19
通讯作者：
Da‐Wei Wang;H. Fang;Feng Li;Zhigang Chen;Qiuping Zhong;G. Lu;Hui‐Ming Cheng
中科院分区：
文献类型：
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作者：
Da‐Wei Wang;H. Fang;Feng Li;Zhigang Chen;Qiuping Zhong;G. Lu;Hui‐Ming Cheng
介绍了一种以排列二氧化钛纳米管（ATNTs）为阳极，有序介孔碳（OMC）为阴极的新型复合电化学电池。该概念的特点是优化阳极的离子传输和阴极的离子吸收。通过减小atnt的管长和壁厚，可以增强阳极中的离子输运。有序介孔和高比表面积的结合显著改善了离子在阴极的传输和吸收。值得注意的是，这些混合电化学储能电池能够在30秒的短电流放电时间内提供25 W h kg - 1的高能量密度和3000 W kg - 1的高功率密度，比之前报道的混合电池高两倍以上。这些混合电池的另一个优点是，由于没有枝晶锂金属和固体电解质间相，它们在长时间运行中是安全稳定的。在基础电化学方面，混合电池的优越性能归因于ATNT阳极中电解液渗透深度和锂离子扩散距离的缩短，促进了有效的锂化阳极过程，以及阴极负离子的快速吸收。
A new hybrid electrochemical cell incorporating aligned titania nanotubes (ATNTs) as the anode and ordered mesoporous carbon (OMC) as the cathode is demonstrated. The concept is characterized by the optimization of ionic transport in the anode and ionic uptake in the cathode. The ionic transport in the anode can be enhanced by reducing the tube length and wall thickness of the ATNTs. The ionic transport and uptake at the cathode is significantly improved by the combination of ordered mesopores and high specific surface area in the OMC. Remarkably, these hybrid electrochemical energy storage cells are capable of delivering a high energy density of 25 W h kg−1 and a high power density of 3000 W kg−1 at a short current‐draining time of 30 s, more than two times higher than in previously reported hybrid cells. Another advantage of these hybrid cells is that they are safe and stable for long periods of operation owing to the absence of dendrite lithium metal and a solid electrolyte interphase. In terms of the fundamental electrochemistry, the superior performance of the hybrid cells is attributed to shortened electrolyte penetration depth and lithium ion diffusion distance in the ATNT anode, facilitating an effective lithiation anode process, and to the fast anion uptake at the cathode.