Halogenated Zn 2+ Solvation Structure for Reversible Zn Metal Batteries
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Abstract
Rechargeable aqueous Zn metal batteries have become promising candidates for large-scale electrochemical energy storage owing to their high safety and affordable low cost. However, Zn metal anode suffers from dendritic growth and hydrogen evolution reaction (HER), deteriorating the electrochemical performance. Here, we demonstrate that these challenges can be conquered by introducing a halogen ion into the Zn2+ solvation structure. By designing an electrolyte composed of zinc acetate and ammonium halide, the electron-donating anion I– can coordinate with Zn2+ and transform the traditional Zn(H2O)62+ to ZnI(H2O)5+, in which I– could transfer electrons into H2O and thus suppress HER. The dynamic electrostatic…
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389
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Authors
9Topics & keywords
Topics
Keywords
- Chemistry
- Faraday efficiency
- Solvation
- Electrolyte
- Electrochemistry
- Anode
- Inorganic chemistry
- Cathode
UN Sustainable Development Goals
- Affordable and clean energy
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