Issue 13, 2024

Interface regulation using a fluorinated vinylene-linked covalent organic framework for a highly stable Zn anode

Abstract

For aqueous zinc-ion batteries, comprehensively optimizing the Zn/electrolyte interface microenvironment is an effective strategy to avoid harmful side reactions and Zn dendrites and thus helps to achieve a high-performance Zn anode. Herein, a functional vinylene-linked covalent organic framework with zincophilic fluorinated sites (TM-4F-COF) is well designed and applied as an interface layer, which modifies the chemical microenvironment at the Zn/electrolyte interface to simultaneously manipulate the Zn plating/stripping behaviors and interfacial side reactions. The TM-4F-COF layer can accelerate Zn2+ de-solvation and interfacial Zn2+ transfer due to the abundant zincophilic fluorinated sites, consequently facilitating the formation of a uniform Zn2+ re-distribution layer. Furthermore, an even electric field is realized at the TM-4F-COF/Zn interface due to the conjugated structure of TM-4F-COF, and the preferentially formed Zn(002) results in a horizontally dense Zn deposition to provide dendrite-free features and high reversibility. A TM-4F-COF@Zn symmetrical cell exhibits an ultra-long cyclability of 2935 h at 3 mA cm−2. Our work provides a fundamental strategy to fabricate a stable Zn anode for high-performance aqueous zinc-ion batteries.

Graphical abstract: Interface regulation using a fluorinated vinylene-linked covalent organic framework for a highly stable Zn anode

Supplementary files

Article information

Article type
Paper
Submitted
05 Dec 2023
Accepted
11 Feb 2024
First published
12 Feb 2024

J. Mater. Chem. A, 2024,12, 7799-7806

Interface regulation using a fluorinated vinylene-linked covalent organic framework for a highly stable Zn anode

Y. Wang, N. Li, H. Liu, H. Sun, Z. Wang, L. Zhai, K. Chen, L. Mi, Z. Fang and Y. Huang, J. Mater. Chem. A, 2024, 12, 7799 DOI: 10.1039/D3TA07497H

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