钒
水溶液
电化学
无机化学
离子
氧化钒
材料科学
电池(电)
阴极
化学工程
水溶液中的金属离子
氧化物
石墨烯
金属
化学
纳米技术
电极
冶金
物理化学
有机化学
功率(物理)
物理
量子力学
工程类
作者
Jing Xu,Yu Zhang,Chenfan Liu,Huanhuan Cheng,Xuanxuan Cai,Dianzeng Jia,He Lin
出处
期刊:Small
[Wiley]
日期:2022-10-13
卷期号:18 (47)
被引量:34
标识
DOI:10.1002/smll.202204180
摘要
Aqueous zinc ion batteries are a promising alternative secondary battery technology due to their excellent safety and environmental friendliness. Vanadium-based compounds as a highly promising class of cathode materials still suffer from structural collapse and slow kinetics. Studies have shown that metal ion pre-introduction is an effective method to solve these problems and enhance battery performance. Here, the introduction of Al3+ , Cr3+ , Cu2+ and Fe3+ is found to effectively reduce the migration energy barrier of Zn2+ with the density functional theory calculations, while Al3+ exhibits the best induction effects. Subsequently, Al0.34 V5 O12 ·2.4H2 O (AlVOH) nanoribbons are synthesized by hydrothermal introduction of Al3+ , demonstratin excellent electrochemical properties (407.8 mAh g-1 at 0.2 A g-1 and 176.3 mAh g-1 after 2000 cycles at 20 A g-1 ). By further compounding with redox graphene (rGO), AlVOH/rGO exhibits high capacitance and specific capacity (460.4 mAh g-1 at 0.2 A g-1 and 180.6 mAh g-1 after 2000 cycles at 20 A g-1 ). In addition, it is found that the introduction of metal ions adjusts the structural water content of the material. Especially, the introduction of Al3+ can increase the interlayer structural water content and make the electrochemical properties of the material more stable.
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