流动电池
锌
电解质
电池(电)
碱性电池
体积流量
电极
储能
电化学
多孔性
材料科学
流量(数学)
法拉第效率
化学工程
化学
冶金
机械
复合材料
热力学
工程类
功率(物理)
物理
物理化学
作者
Ziqi Chen,Wentao Yu,Yongfu Liu,Yikai Zeng,Qijiao He,Peng Tan,Meng Ni
标识
DOI:10.1016/j.cej.2020.126684
摘要
The alkaline zinc-iron flow battery is an emerging electrochemical energy storage technology with huge potential, while the theoretical investigations are still absent, limiting performance improvement. A transient and two-dimensional mathematical model of the charge/discharge behaviors of zinc-iron flow batteries is established. After validated by experimental data, numerical analysis is carried out focusing on the influences of electrolyte flow rate and electrode geometry towards the electrochemical performance. The results demonstrate that a high flow rate, high electrode thickness, and porosity are favorable for battery performance. Following this finding, the parameters of a zinc-iron flow battery are optimized by utilizing a high flow rate of 50 mL min−1, an asymmetrical structure with a negative electrode of 7 mm and a positive electrode of 10 mm, and high porosity of 0.98. With the optimal flow rate and geometry, the electrolyte utilization, coulombic efficiency, and energy efficiency attain 98.62%, 99.18%, and 92.84%, respectively, significantly higher than those of the un-optimized design. This work provides a comprehensive strategy allowing for the improvement of the practical design of zinc-iron flow batteries.
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