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Nanobelt-like vanadium dioxide with three-dimensional interconnected tunnel structure enables ultrafast Al-ion storage
Materials Today Energy ( IF 9.3 ) Pub Date : 2020-11-08 , DOI: 10.1016/j.mtener.2020.100578
Y. Wang , X. Shi , J. Wang , X. Liu , X. Lu

Aqueous aluminum-based batteries (AABs) are one of promising energy storage systems because of its high safety and high capacity of aluminum. However, the capacity and cycling performance are limited by the unstable structure of cathode materials, which hinder the further applications of AABs. Here, we develop nanobelt-like vanadium dioxide (VO2) with three-dimensional interconnected tunnel structure as fast Al3+ storage cathode for AABs. The VO2 electrode can deliver a high capacity of 235 mAh g−1 at the current density of 200 mA g−1 as well as a good rate ability of 49.3% capacity retention as the current density increases to 2 A g−1. Moreover, ex situ characterizations further confirm the Al3+ ion intercalation/deintercalation mechanism in VO2 during the charge/discharge process. Our work provides new design principle for improving cathode performance in AABs.



中文翻译:

具有三维互连隧道结构的类似纳米带的二氧化钒,可实现超快的Al离子存储

铝制水基电池(AAB)由于其高安全性和铝的高容量而成为有前途的储能系统之一。然而,容量和循环性能受到阴极材料不稳定结构的限制,这阻碍了AAB的进一步应用。在这里,我们开发了具有三维互连隧道结构的纳米带状二氧化钒(VO 2),作为AAB的快速Al 3+存储阴极。VO 2电极在200 mA g -1的电流密度下可以提供235 mAh g -1的高容量,并且随着电流密度增加到2 A g -1可以提供49.3%的容量保持率。此外,异位表征进一步证实了在充电/放电过程中VO 2中的Al 3+离子嵌入/脱嵌机理。我们的工作为提高AAB中的阴极性能提供了新的设计原理。

更新日期:2021-01-01
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