Research on Iron-Lead Semi-Flow Battery Based on 3D Solid Electrode

doi:10.6023/A21090440

Abstract

Low-cost large-scale electrochemical energy storage technology is of great significance for the efficient use of clean and renewable energy such as solar and wind energy. In this work, a 3D lead electrode is designed as a high-performance negative electrode, and an iron-lead (Fe-Pb) semi-flow battery is constructed on this basis. The positive and negative active materials of the battery are ferrous sulfate/iron sulfate and lead/lead sulfate respectively, and sulfuric acid aqueous solution is used as the supporting electrolyte. The negative electrode uses acetylene carbon black (ACET) as an effective additive to form a highly conductive network with a porous structure, and the performance of the battery can be significantly improved by adding ACET in the native electrode. Moreover, benefiting from the novel design of the battery, problems of metal dendrites, hydrogen evolution and irreversible sulfation of the Pb electrode can be avoided. The results show that the introduction of ACET in the negative electrode as a conductive agent can effectively improve the energy efficiency, the utilization rate of the active material of the negative electrode and the rate performance of the battery. The effect of the ACET content on the performance including the current efficiency, voltage efficiency and energy efficiency of the battery has been studied. It is illustrated that an ACET mass content of 12.5% over the active materials in the negative electrode is preferred. At a current density of 20 mA/cm², the specific capacity of the negative electrode can reach 89.3 mAh/g, the battery current efficiency and energy efficiency can reach 99.3% and 88.6%, respectively. Cycling stability of the Fe-Pb semi-flow battery is also investigated in this work. The result shows that the designed battery has excellent cycling stability during the stability test. In addition, the estimated cost of the active material for this battery can be as low as 53.27 $/kWh, which is lower than most of the other energy storage battery systems. Therefore, as a low-cost large-scale electrochemical energy storage battery technology, the iron-lead semi-flow battery has a good research prospect.

Key words: iron-lead battery, flow battery, large-scale energy storage, electrochemical energy storage, aqueous battery

Cite this article

Zhuhan Zhang, Fengjing Jiang, Keke Wu, Peng Shen. Research on Iron-Lead Semi-Flow Battery Based on 3D Solid Electrode[J]. Acta Chimica Sinica, 2022, 80(1): 56-62.

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Fig. & Tab. 8

Figure 1. Schematic diagram of the iron-lead semi-flow single battery

Figure 2. CV curves of FeSO4 solution and negative electrode with and without ACET

Figure 3. SEM images of (a~c) negative electrode with 10% ACET and (d) negative electrode without ACET (a) Zoom in 5000 times; (b) Zoom in 20000 times; (c) Zoom in 50000 times

Figure 4. (a) Charge and discharge curves of battery with and without ACET in negative electrode at 20 mA/cm2 and (b) Nyquist plots of battery with and without ACET in negative electrode

Figure 5. Coulombic efficiency, voltage efficiency, energy efficiency and specific discharge capacity of single battery with 10% ACET in negative electrode at 20 mA/cm2

Figure 6. (a) Specific discharge capacity at various current density and (b) coulombic efficiency, voltage efficiency and energy efficiency at various current density

Figure 7. (a) Coulombic efficiency, voltage efficiency, energy efficiency and (b) specific discharge capacity at 20 mA/cm2 of battery with different ACET content

Figure 8. Coulombic efficiency, voltage efficiency, energy efficiency and specific discharge capacity of the single cell with 12.5% ACET in the negative electrode during 100-cycle stability test

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