Volume 63, Issue 51 e202412559
Communication

Zinc-Ferricyanide Flow Batteries Operating Stably under −10 °C

Liping Zhi

Liping Zhi

Division of Energy Storage, Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Chenyi Liao

Chenyi Liao

Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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Pengcheng Xu

Pengcheng Xu

Division of Energy Storage, Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

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Prof. Guohui Li

Prof. Guohui Li

Laboratory of Molecular Modeling and Design, State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian, 116023 China

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Prof. Zhizhang Yuan

Corresponding Author

Prof. Zhizhang Yuan

Division of Energy Storage, Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

Key Laboratory of Long-Duration and Large-Scale Energy Storage, Chinese Academy of Sciences, Dalian, 116023 China

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Prof. Xianfeng Li

Corresponding Author

Prof. Xianfeng Li

Division of Energy Storage, Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 China

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First published: 05 September 2024
Citations: 2

Graphical Abstract

Lithium-based chemistries enables ferri/ferro-cyanide redox couple with high concentration of 0.8 M to access a broad range of physicochemical and electrochemical properties at −10 °C that represents the lowest operating temperature for ferri/ferro-cyanide catholyte reported so far.

Abstract

Alkaline ferri/ferro-cyanide-based flow batteries are well suited for energy storage because of their features of high electrochemical activity, good kinetics and low material cost. However, they suffer from low energy density and poor temperature adaptability. The ferri/ferro-cyanide catholyte exhibits low solubility (~0.4 M at 25 °C) in NaOH- or KOH-based supporting electrolyte and can easily form precipitates below room temperature. Here we report a lithium-based supporting electrolyte that significantly enhances the solubility of ferrocyanide. The use of LiOH intensifies the ion-dipole interaction between water molecules and solutes and cripples polarization among ferrocyanide ions. Thus, we have achieved a ferrocyanide-based catholyte of 1.7 M at 25 °C and of 0.8 M at −10 °C. A zinc-ferricyanide flow battery based on the lithium-based supporting electrolyte demonstrates a steady charge energy of ~72 Wh L−1catholyte at 25 °C, and maintains stable for ~4200 cycles (~4200 hours). Furthermore, it remains stable for ~800 cycles (~800 hours) at −10 °C.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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