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Dynamic Polyiodide-Trapping and Proton-Capturing Dual-Network Engineering for High-Areal-Capacity, Long-Cycling and
Yi Tan1, Weihua Xu1, Fan Yang2
1University Engineering Research Center of Green Chemical New Materials, Guangxi Key Laboratory of Electrochemical Energy Materials, School of Chemistry and Chemical Engineering, Guangxi University, Nanning, China.
Advanced Materials (Deerfield Beach, Fla.)
|January 12, 2026
Summary
Aminonicotinic acid (AMI) effectively traps polyiodides and buffers pH in aqueous zinc-iodine batteries. This dual-network strategy enhances stability and enables high iodine loading for grid-scale energy storage.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous zinc-iodine (Zn-I2) batteries offer potential for grid-scale energy storage.
- Challenges include polyiodide shuttling and interfacial reactions, limiting performance with high iodine loading.
Purpose of the Study:
- To address polyiodide shuttling and interfacial reactions in aqueous Zn-I2 batteries.
- To introduce aminonicotinic acid (AMI) as a dual-functional electrolyte additive.
Main Methods:
- Dynamic polyiodide-trapping using AMI's active sites to inhibit dissolution and migration.
- Proton-capturing and pH-buffering by AMI to suppress side reactions at the zinc anode.
Main Results:
- AMI effectively traps triiodide ions (I3-).
- AMI mitigates pH fluctuations, suppressing interfacial side reactions on the zinc anode.
- Zn//Zn symmetrical batteries show >7000 h stability.
- Zn-I2 batteries achieve >2800 cycles with ultrahigh iodine loading (23.8 mg cm-2) and >3000 cycles at 50°C.
Conclusions:
- AMI serves as a novel electrolyte additive for polyiodide-trapping and pH-buffering.
- This strategy enables energy-dense, durable, and high-temperature aqueous Zn-I2 batteries.
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