Regulating Interlayer‐Spacing of Vanadium Phosphates for High‐Capacity and Long‐Life Aqueous Iron‐Ion Batteries

Although the research on aqueous batteries employing metal as the anode is still mainly focused on the aqueous zinc‐ion battery, aqueous iron‐ion batteries are considered as promising aqueous batteries owing to the lower cost, higher specific capacity, and better stability. However, the sluggish Fe2...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-02, Vol.20 (6), p.e2305766-n/a
Main Authors: Li, Chang, Xu, Yushuang, Deng, Wenjun, Zhou, Yi, Guo, Xinyu, Chen, Yan, Li, Rui
Format: Article
Language:English
Subjects:
aqueous iron‐ion batteries
Cathodes
Diffusion rate
Electrochemical analysis
Electrode materials
excellent cycle performance
Fe2+ intercalation
Ferrous ions
interlayer spacing
Interlayers
Iron
Phosphates
Stability
vanadium phosphates
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Summary:Although the research on aqueous batteries employing metal as the anode is still mainly focused on the aqueous zinc‐ion battery, aqueous iron‐ion batteries are considered as promising aqueous batteries owing to the lower cost, higher specific capacity, and better stability. However, the sluggish Fe2+ (de)intercalation leads to unsatisfactory specific capacity and poor electrochemical stability, which makes it difficult to find cathode materials with excellent electrochemical properties. Herein, phenylamine (PA)‐intercalated VOPO4 materials with expanded interlayer spacing are synthesized and applied successfully in aqueous iron‐ion batteries. Owing to enough diffusion space from the expanded interlayer, which can boost fast Fe2+ diffusion, the aqueous iron‐ion battery shows a high specific capacity of 170 mAh g−1 at 0.2 A g−1, excellent rate performance, and cycle stability (96.2% capacity retention after 2200 cycles). This work provides a new direction for cathode material design in the development of aqueous iron‐ion batteries. PA@VOPO4 is a robust cathode material for rechargeable aqueous iron‐ion batteries after PA is inserted into VOPO4 to expand the interlayer spacing, which can boost fast Fe2+ diffusion. The aqueous iron‐ion battery shows a high specific capacity of 170 mAh g−1 at 0.2 A g−1, excellent rate performance, and cycle stability (96.2% capacity retention after 2200 cycles), which is remarkable among reported iron‐storage materials.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202305766