New Alkalescent Electrolyte Chemistry for Zinc-Ferricyanide Flow Battery.
Angew Chem Int Ed Engl
; 63(28): e202403607, 2024 Jul 08.
Article
en En
| MEDLINE
| ID: mdl-38659136
ABSTRACT
Alkaline zinc-ferricyanide flow batteries are efficiency and economical as energy storage solutions. However, they suffer from low energy density and short calendar life. The strongly alkaline conditions (3â
mol L-1 OH-) reduce the solubility of ferri/ferro-cyanide (normally only 0.4â
mol L-1 at 25 °C) and induce the formation of zinc dendrites at the anode. Here, we report a new zinc-ferricyanide flow battery based on a mild alkalescent (pHâ
12) electrolyte. Using a chelating agent to rearrange ferri/ferro-cyanide ion-solvent interactions and improve salt dissociation, we increased the solubility of ferri/ferro-cyanide to 1.7â
mol L-1 and prevented zinc dendrites. Our battery has an energy density of ~74â
Wh L-1 catholyte at 60 °C and remains stable for 1800â
cycles (1800â
hours) at 0 °C and for >1400â
cycles (2300â
hours) at 25 °C. An alkalescent zinc-ferricyanide cell stack built using this alkalescent electrolyte stably delivers 608â
W of power for ~40â
days.
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Bases de datos:
MEDLINE
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Año:
2024
Tipo del documento:
Article
País de afiliación:
China