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Stabilizing Zn Metal Anode via an Innovative Cu-MOF/Carbon Cloth Ion-Buffering Layer
Yuhan Fu1, Yali Li1, Yang Chen1
1LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China.
ACS Applied Materials & Interfaces
|July 21, 2025
Summary
Metal-organic frameworks (MOFs) improve aqueous zinc-ion batteries by preventing dendrite growth. A novel Cu-MOF on carbon cloth (CM-C) layer significantly enhances cycling stability and battery performance.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Aqueous zinc-ion batteries (AZIBs) face challenges like dendrite formation and side reactions, limiting their performance.
- Metal-organic frameworks (MOFs) offer potential solutions due to their porous structure, large surface area, and tunable active sites for regulating ion flux.
- Developing effective anode strategies is crucial for advancing AZIB technology.
Purpose of the Study:
- To synthesize a Cu-MOF in situ on carbon cloth (CM-C) as an ion-buffering layer for AZIBs.
- To investigate the effect of the CM-C layer on Zn deposition, side reactions, and overall battery performance.
- To enhance the cycling stability and capacity of aqueous zinc-ion batteries.
Main Methods:
- In situ synthesis of a copper-based metal-organic framework (Cu-MOF) onto a carbon cloth substrate (CM-C).
- Fabrication of AZIBs utilizing the CM-C material as an ion-buffering layer.
- Electrochemical testing, including galvanostatic cycling at various current densities and long-term stability assessments.
Main Results:
- The CM-C layer effectively regulated Zn2+ flux, promoting uniform Zn deposition and suppressing dendrite formation.
- Batteries with the CM-C layer exhibited extended cycle life: nearly 800 h at 10.0 mA cm-2 and nearly 1200 h at 5.0 mA cm-2.
- Exceptional cycling stability was observed, with an average Coulombic efficiency of 99.3% after 2000 cycles at 5.0 mA cm-2.
- The full battery incorporating CM-C demonstrated improved capacity and enhanced operational stability.
Conclusions:
- The in situ synthesized Cu-MOF on carbon cloth (CM-C) acts as an effective ion-buffering layer in aqueous zinc-ion batteries.
- This strategy significantly mitigates anode-related issues, leading to remarkable improvements in cycling life and Coulombic efficiency.
- The CM-C configuration presents a simple yet novel approach for developing high-performance and stable zinc-ion batteries.
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