A Zinc-Bromine Battery with Deep Eutectic Electrolytes.

ABSTRACT: A deep eutectic solvent (DES) is an ionic liquid-analog electrolyte, newly emerging due to its low cost, easy preparation, and tunable properties. Herein, a zinc-bromine battery (ZBB) with a Zn-halide-based DES electrolyte prepared by mixing ZnBr₂ , ZnCl₂ , and a bromine-capturing agent is reported. The water-free DES electrolyte allows a closed-cell configuration for the ZBB owing to the prevention of Br₂ evaporation and H₂ evolution. It is found that the Cl^- anion changes the structure of the zinc-halide complex anions and demonstrated that it improves the ion mobility and electrode reaction kinetics. The DES electrolyte with the optimized ZnCl₂ composition shows much higher rate capability and a cycle life 90 times longer

SUBMITTER: Heo J 

PROVIDER: S-EPMC9798974 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature