Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (1): 78-88.doi: 10.19799/j.cnki.2095-4239.2021.0382

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Current situations and prospects of zinc-iron flow battery

Zhen YAO1(), Rui WANG1, Xue YANG1, Qi ZHANG1, Qinghua LIU1, Baoguo WANG2, Ping MIAO1   

  1. 1.National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China
    2.Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2021-08-02 Revised:2021-08-31 Online:2022-01-05 Published:2022-01-10
  • Contact: Zhen YAO E-mail:zhen.yao.c@chnenergy.com.cn

Abstract:

Zinc-iron flow batteries are one of the most promising electrochemical energy storage technologies because of their safety, stability, and low cost. This review discusses the current situations and problems of zinc-iron flow batteries. These batteries can work in a wide range of pH by adopting different varieties of iron couples. An alkaline zinc-iron flow battery usually has a high open-circuit voltage and a long life cycle performance using porous electrode and membrane. In an acidic zinc-iron flow battery, the iron ions in the positive side have good solubility and reversible chemical stability, while zinc in the negative side is greatly affected by the pH. The neutral zinc-iron flow battery has attracted more attention due to its mild condition and low cost using a porous membrane. However, all kinds of zinc-iron flow battery suffer from zinc dendrite and low areal capacity, which hinders its commercial development. Some prospects for developing new electrolyte, electrode, membrane, and battery structures combining experiment and accurate physical models are finally proposed.

Key words: flow battery, zinc-iron flow battery, zinc dendrite, zinc-based flow battery, battery energy storage

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