Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.151
Publication date: 22nd December 2022
Rechargeable aqueous Zinc (Zn) batteries are one of the emerging beyond lithium-ion batteries that could fulfil the requirements of cost-effective, safe, and reliable large-scale storage systems.[1,2] Zn metal is abundant, globally available, non-toxic and stable under air and humid atmosphere, with a promising theoretical capacity of 820 mA h/g.[3] However, aqueous Zn batteries encounter several degradations upon cycling due to the dendrite formation, poor Coulombic efficiency and hydrogen evolution reaction in dilute electrolytes.[4]
In this work, we report eutectic aqueous electrolytes based on Zn and lithium /or sodium salts at different ratios with very low water content. The cost-effective and fluorine-free electrolyte shows a high electrochemical stability window (~3V), which enables reversible and uniform Zn electrodeposition during long-term cycling. The eutectic aqueous electrolytes also demonstrate a low glass transition temperature allowing a wide temperature-range battery operation. This work significantly provides an effective strategy for high voltage and low-temperature aqueous Zn metal batteries.
This project has received funding from the European Union’s Framework programme for Research and Innovation Horizon 2020(2014-2021) under the Marie Skłodowska-Curie Grant Agreement No. 101032227.