Lithium Ferrocyanide Catholyte for High-Energy and Low-cost Aqueous Redox Flow Batteries.
Angew Chem Int Ed Engl
; 62(25): e202304667, 2023 Jun 19.
Article
em En
| MEDLINE
| ID: mdl-37081714
ABSTRACT
Aqueous redox flow batteries (ARFBs) are a promising technology for grid-scale energy storage, however, their commercial success relies on redox-active materials (RAM) with high electron storage capacity and cost competitiveness. Herein, a redox-active material lithium ferrocyanide (Li4 [Fe(CN)6 ]) is designed. Li+ ions not only greatly boost the solubility of [Fe(CN)6 ]4- to 2.32â
M at room temperature due to weak intermolecular interactions, but also improves the electrochemical performance of [Fe(CN)6 ]4-/3- . By coupling with Zn, ZIRFBs were built, and the capacity of the batteries was as high as 61.64â
Ah L-1 (pH-neutral) and 56.28â
Ah L-1 (alkaline) at a [Fe(CN)6 ]4- concentration of 2.30â
M and 2.10â
M. These represent unprecedentedly high [Fe(CN)6 ]4- concentrations and battery energy densities reported to date. Moreover, benefiting from the low cost of Li4 [Fe(CN)6 ], the overall chemical cost of alkaline ZIRFB is as low as $11 per kWh, which is one-twentieth that of the state-of-the-art VFB ($211.54â
per kWh). This work breaks through the limitations of traditional electrolyte composition optimization and will strongly promote the development of economical [Fe(CN)6 ]4-/3- -based RFBs in the future.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ferrocianetos
/
Lítio
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article