阴极
电化学
钒
水溶液
氧化还原
材料科学
限制
离子
电极
化学工程
化学
无机化学
机械工程
有机化学
物理化学
工程类
作者
Shuyue Li,Dongxu Yu,Jingyi Liu,Nan Chen,Zhongxiang Shen,Gang Chen,Shiyu Yao,Fei Du
标识
DOI:10.1002/advs.202206836
摘要
Layered vanadium-based oxides are the promising cathode materials for aqueous zinc-ion batteries (AZIBs). Herein, an in situ electrochemical strategy that can effectively regulate the interlayer distance of layered NH4 V4 O10 quantitatively is proposed and a close relationship between the optimal performances with interlayer space is revealed. Specifically, via increasing the cutoff voltage from 1.4, 1.6 to 1.8 V, the interlayer space of NH4 V4 O10 can be well-controlled and enlarged to 10.21, 11.86, and 12.08 Å, respectively, much larger than the pristine one (9.5 Å). Among them, the cathode being charging to 1.6 V (NH4 V4 O10 -C1.6), demonstrates the best Zn2+ storage performances including high capacity of 223 mA h g-1 at 10 A g-1 and long-term stability with capacity retention of 97.5% over 1000 cycles. Such superior performances can be attributed to a good balance among active redox sites, charge transfer kinetics, and crystal structure stability, enabled by careful control of the interlayer space. Moreover, NH4 V4 O10 -C1.6 delivers NH4+ storage performances whose capacity reaches 296 mA h g-1 at 0.1 A g-1 and lifespan lasts over 3000 cycles at 5 A g-1 . This study provides new insights into understand the limitation of interlayer space for ion storage in aqueous media and guides exploration of high-performance cathode materials.
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