钒铌氧化物的竞争氧化还原化学用于超快和持久的锂存储。

IF 31.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nano-Micro Letters Pub Date : 2023-08-10 DOI:10.1007/s40820-023-01172-9

Xiaobo Ding, Jianhao Lin, Huiying Huang, Bote Zhao, Xunhui Xiong

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引用次数: 0

摘要

五氧化二铌(Nb2O5)阳极以其优异的倍率性能和高安全性在大功率锂离子电池中得到越来越多的关注。然而，Nb2O5阳极经改性后循环稳定性较差，其机理尚不明确，制约了其实际应用。本文首次证明了Nb5+的过还原是导致容量损失的关键原因。此外，研究了一种有效的竞争性氧化还原策略，解决了Nb2O5容量快速衰减的问题，该策略可以通过掺入钒形成新的金红石型VNbO4阳极来实现。VNbO4中高度可逆的V3+/V2+氧化还原对可以有效抑制Nb5+的过度还原。此外，电子从V3+向Nb5+的迁移可以大大提高VNbO4的本征电子导电性。结果表明，VNbO4阳极在0.1 a g-1下可提供206.1 mAh g-1的高容量，并且在1.0 a g-1下循环2000次后保持93.4%的显着循环性能。此外，组装的锂离子电容器在5.8 kW kg-1下具有44 Wh kg-1的高能量密度。总之，我们的工作为超快速和耐用阳极的设计提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Competitive Redox Chemistries in Vanadium Niobium Oxide for Ultrafast and Durable Lithium Storage

Highlights

The over-reduction from Nb⁵⁺ to Nb³⁺ in the lithiation process have been demonstrated to be the critical reason for the capacity decay of Nb₂O₅ for the first time.
A novel competitive redox strategy has been proposed to suppress the over-reduction of Nb⁵⁺ to Nb³⁺, which can be achieved by the incorporation of vanadium to form a new rutile VNbO₄ anode.
The performance of VNbO₄ anode designed in this study stands among the best in cycle stability.

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来源期刊

Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

42.40

自引率

4.90%

发文量

715

审稿时长

13 weeks

期刊介绍： Nano-Micro Letters is a peer-reviewed, international, interdisciplinary and open-access journal that focus on science, experiments, engineering, technologies and applications of nano- or microscale structure and system in physics, chemistry, biology, material science, pharmacy and their expanding interfaces with at least one dimension ranging from a few sub-nanometers to a few hundreds of micrometers. Especially, emphasize the bottom-up approach in the length scale from nano to micro since the key for nanotechnology to reach industrial applications is to assemble, to modify, and to control nanostructure in micro scale. The aim is to provide a publishing platform crossing the boundaries, from nano to micro, and from science to technologies.