Issue 12, 2024

A covalent organic framework as a dual-active-center cathode for a high-performance aqueous zinc-ion battery

Abstract

Organic electrode materials have shown significant potential for aqueous Zn ion batteries (AZIBs) due to their flexible structure designability and cost advantage. However, sluggish ionic diffusion, high solubility, and low capacities limit their practical application. Here, we designed a covalent organic framework (TA-PTO-COF) generated by covalently bonding tris(4-formylbiphenyl)amine (TA) and 2,7-diaminopyrene-4,5,9,10-tetraone (PTO-NH2). The highly conjugated skeleton inside enhances its electron delocalization and intermolecular interaction, leading to high electronic conductivity and limited solubility. The open channel within the TA-PTO-COF provides ionic diffusion pathways for fast reaction kinetics. In addition, the abundant active sites (C[double bond, length as m-dash]N and C[double bond, length as m-dash]O) endow the TA-PTO-COF with a large reversible capacity. As a result, the well-designed TA-PTO-COF cathode delivers exceptional capacity (255 mA h g−1 at 0.1 A g−1), excellent cycling stability, and a superior rate capacity of 186 mA h g−1 at 10 A g−1. Additionally, the co-insertion mechanism of Zn2+/H+ within the TA-PTO-COF cathode is revealed in depth by ex situ spectroscopy. This study presents an effective strategy for developing high-performance organic cathodes for advanced AZIBs.

Graphical abstract: A covalent organic framework as a dual-active-center cathode for a high-performance aqueous zinc-ion battery

Supplementary files

Article information

Article type
Edge Article
Submitted
31 dec 2023
Accepted
26 jan 2024
First published
27 jan 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 4341-4348

A covalent organic framework as a dual-active-center cathode for a high-performance aqueous zinc-ion battery

H. Li, M. Cao, Z. Fu, Q. Ma, L. Zhang, R. Wang, F. Liang, T. Zhou and C. Zhang, Chem. Sci., 2024, 15, 4341 DOI: 10.1039/D3SC07013A

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