Facile Zn 2+ Desolvation Enabled by Local Coordination Engineering for Long‐Cycling Aqueous Zinc‐Ion Batteries
Abstract Aqueous zinc‐ion batteries (AZIBs) have aroused continuously increasing attention for grid‐scale energy storage applications. However, the progress of AZIBs is largely plagued by their sluggish reaction kinetics and poor structural reversibility, which are closely related to the desolvation...
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Published in | Advanced functional materials Vol. 33; no. 32 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.08.2023
|
Online Access | Get full text |
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Summary: | Abstract
Aqueous zinc‐ion batteries (AZIBs) have aroused continuously increasing attention for grid‐scale energy storage applications. However, the progress of AZIBs is largely plagued by their sluggish reaction kinetics and poor structural reversibility, which are closely related to the desolvation process of hydrated Zn
2+
. Herein, a strategy of local coordination engineering is proposed to modulate both surface and bulk structure of a conventional α‐MnO
2
cathode to overcome these issues. Theoretical simulations and experimental characterizations reveal that the surface F coordinations effectively adjust the absorption strength toward H
2
O and Zn, which facilitates the desolvation of hydrated Zn
2+
and thus improves the interfacial ion diffusion rate and reaction kinetics. Meanwhile, the structural integrity is largely enhanced with suppressed irreversible phase evolution over cycling benefiting from the presence of robust MnF bonds in the bulk lattice. As a consequence, the achieved cathode exhibits almost no capacity degradation after 400 cycles at a low current density of 0.5 A g
‐1
and long‐term durability over 3500 cycles at a high current density of 5 A g
‐1
. The proposed modulation strategy provides new opportunities for designing long‐cycling and high‐energy cathodes for AZIBs and beyond. |
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ISSN: | 1616-301X 1616-3028 |
DOI: | 10.1002/adfm.202301648 |