Zinc-Ion Conductive Metal-Organic Framework Interfaces for Comprehensive Anode Protection in High-Performance Aqueous...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Aqueous zinc-ion batteries (AZIBs) offer safety and cost advantages but face challenges like dendrite formation and limited cycle life.
• These issues hinder the practical application of AZIBs in energy storage.

Purpose of the Study:

• To develop a stable zinc anode interface for high-performance AZIBs.
• To address challenges such as Zn dendrite formation and limited cycle life in AZIBs.

Main Methods:

• A composite coating of sodium alginate (SA) and zeolite imidazole framework (ZIF-7) was applied to the zinc anode.
• The coating utilizes SA's Zn2+ affinity and ZIF-7's ion transport channels for uniform ion flux and deposition.

Main Results:

• The ZIF-7/SA coated zinc anode (ZIF-7/SA@Zn) demonstrated high Coulombic efficiency (99.7% after 1500 cycles) and stable cycling under high current densities.
• A full cell with ZIF-7/SA@Zn and a Zn0.25V2O5 cathode retained over 77.2% capacity after 10,000 cycles.

Conclusions:

• The ZIF-7/SA coating effectively stabilizes zinc anodes, promoting uniform ion flux and oriented deposition.
• This strategy advances the development of high-performance and durable AZIBs for energy storage applications.