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Integrating Electric Ambipolar Effect for High-Performance Zinc Bromide Batteries
Wenda Li1, Hengyue Xu2, Shanzhe Ke1
1State Key Laboratory of Precision Spectroscopy, Engineering Research Center of Nanophotonics and Advanced Instrument (Ministry of Education), School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, People's Republic of China.
Nano-Micro Letters
|February 13, 2025
Summary
Researchers developed a novel electrolyte for high-performance aqueous rechargeable zinc batteries. This new electrolyte broadens the voltage range and improves compatibility, enabling stable zinc anode cycling for over 2400 hours.
Area of Science:
- Electrochemistry
- Materials Science
- Energy Storage
Background:
- Aqueous rechargeable zinc batteries aim for fast redox kinetics, high energy density, and long lifespan.
- Key challenges include a narrow voltage range and poor electrolyte-electrode compatibility.
- These limitations hinder the practical application of advanced zinc battery technologies.
Purpose of the Study:
- To introduce an electric ambipolar effect for synergistic manipulation of zinc-ion electrolytes.
- To enable high-performance aqueous rechargeable Zn-Br2 batteries.
- To overcome limitations of voltage range and electrode compatibility in zinc batteries.
Main Methods:
- Development of a Zn2+ ternary-hydrated eutectic electrolyte (ZTE) utilizing an electric ambipolar effect.
- Incorporation of L-carnitine (L-CN) and sulfamide as bipolar ligands.
- Analysis of cation solvation sheath reorganization and interphase formation.
Main Results:
- The electric ambipolar effect created Zn[(L-CN)(SA)(H2O)4]2+ configurations, broadening the electrochemical window to 2.9 V.
- The electrolyte exhibited high ionic conductivity and restricted water molecules.
- Stable Zn anode plating/stripping over 2400 hours was achieved due to electrostatic shielding and interphase formation.
Conclusions:
- The novel ZTE electrolyte, with its synergetic electro/nucleophilicity and compatibility, significantly enhances Zn-Br2 battery performance.
- It boosts conversion redox, providing high specific capacity and stable cycling.
- This work offers a new strategy for designing advanced electrolytes for zinc-ion batteries.
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