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A Lean-Water Hydrogel Electrolyte with Engineered Water-Lubricated Pathways Constructed by Unique Water-Inter-Micelle
Guochen Ji1, Miao Sun1, Meizhi Li1
1Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|November 20, 2025
Summary
This study introduces lean-water hydrogel electrolytes (HPEs) with a unique micelle structure. This design enhances zinc ion transport and suppresses side reactions in aqueous batteries, improving performance with reduced water content.
Area of Science:
- Materials Science
- Electrochemistry
- Polymer Science
Background:
- Hydrogel polymer electrolytes (HPEs) offer advantages over liquid electrolytes in aqueous batteries, including reduced leakage and fewer side reactions.
- However, high water content (>80%) in conventional HPEs can still lead to detrimental water-mediated side reactions.
- Lean-water HPEs aim to minimize water content but face challenges with hindered Zn2+ transport due to strong polymer-ion interactions.
Purpose of the Study:
- To design a lean-water hydrogel electrolyte that overcomes the limitations of insufficient water content for efficient Zn2+ transport.
- To engineer water pathways within the hydrogel structure to facilitate ion migration.
- To develop a hydrogel electrolyte with high ionic conductivity, suppressed side reactions, and improved stability for aqueous batteries.
Main Methods:
- Designed a lean-water hydrogel electrolyte utilizing a self-assembled micelle structure of zinc dodecylbenzenesulfonate to confine water.
- Synthesized a P(AM-ACMO) (PAC) lean-water hydrogel electrolyte via copolymerization of acrylamide (AM) and 4-acryloylmorpholine (ACMO).
- Characterized the hydrogel's structure, ionic conductivity, Zn2+ transference number, adhesion, and dehydration resistance.
Main Results:
- The unique water-inter-micelle structure enabled rapid Zn2+ migration along water-lubricated interstices, achieving 15.3 mS cm-1 conductivity at 20.6 wt.% water.
- The PAC hydrogel electrolyte exhibited ordered slit channels, establishing continuous water pathways with trace water amounts.
- Achieved high ionic conductivity (3.2 mS cm-1) and Zn2+ transference number (0.88) at only 17.8 wt.% water content, alongside excellent adhesion and dehydration resistance.
Conclusions:
- Engineered lean-water hydrogel electrolytes with a micelle-based structure effectively address the trade-off between low water content and ion transport.
- The developed PAC hydrogel electrolyte demonstrates superior performance in terms of ionic conductivity, Zn2+ transport, and stability for aqueous batteries.
- The material's properties suggest significant potential for practical applications in advanced energy storage devices.
