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Multidentate Chelating Ligands Enable High-Performance Zinc-Bromine Flow Batteries
Weicheng Xia1, Kunchi Xie2, Shang Gao1
1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Angewandte Chemie (International Ed. in English)
|October 30, 2024
Summary
Ethylenediamine tetramethylene phosphonic acid (EDTMPA) enhances zinc bromine flow batteries by improving zinc anode stability. This novel additive prevents dendrite growth and extends cycling life for reliable stationary energy storage.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Zinc bromine flow batteries (ZBFBs) are key for stationary energy storage.
- Zinc anodes face challenges like dendrite growth and hydrogen evolution.
- Current additives have limited zinc interaction and solvation control.
Purpose of the Study:
- To introduce ethylenediamine tetramethylene phosphonic acid (EDTMPA) as a novel additive for ZBFBs.
- To enhance zinc anode performance and battery longevity.
- To investigate EDTMPA's mechanism in stabilizing the zinc anode.
Main Methods:
- Synthesized and characterized EDTMPA as a zinc anode additive.
- Evaluated ZBFB performance using symmetric cells and full cells.
- Analyzed zinc anode morphology and solvation structure changes.
Main Results:
- EDTMPA additive significantly improved coulombic efficiency to 99.4% over 800 cycles.
- Achieved dendrite-free cycling for over 400 cycles at 80 mA cm⁻².
- EDTMPA promoted a water-deficient inner Helmholtz plane and restructured Zn²⁺ solvation.
Conclusions:
- EDTMPA effectively suppresses zinc dendrites and hydrogen evolution.
- The six zincophilic sites in EDTMPA enhance zinc interaction and stability.
- EDTMPA represents a significant advancement for ZBFB technology.
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