Please use this identifier to cite or link to this item: https://doi.org/10.1002/anie.202304667
Title: Lithium Ferrocyanide Catholyte for High-Energy and Low-cost Aqueous Redox Flow Batteries.
Authors: Li, Xiaotong
Yao, Yuan
Liu, Chenxi
Jia, Xin
Jian, Jiahuang
Guo, Bao
Lu, Songtao
Qin, Wei
Wang, Qing 
Wu, Xiaohong
Keywords: aqueous redox flow battery
Li4[Fe(CN)6]
solubility
capacity
low-cost
Issue Date: 20-Apr-2023
Publisher: Wiley
Citation: Li, Xiaotong, Yao, Yuan, Liu, Chenxi, Jia, Xin, Jian, Jiahuang, Guo, Bao, Lu, Songtao, Qin, Wei, Wang, Qing, Wu, Xiaohong (2023-04-20). Lithium Ferrocyanide Catholyte for High-Energy and Low-cost Aqueous Redox Flow Batteries.. Angew Chem Int Ed Engl : e202304667-. ScholarBank@NUS Repository. https://doi.org/10.1002/anie.202304667
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 2.32 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 61.64 Ah/L (pH-neutral) and 56.28 Ah/L (alkaline) at a [Fe(CN)6]4- concentration of 2.30 M and 2.10 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 ($211.54 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.
Source Title: Angew Chem Int Ed Engl
URI: https://scholarbank.nus.edu.sg/handle/10635/239210
ISSN: 1433-7851,1521-3773
1521-3773
DOI: 10.1002/anie.202304667
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