全铁液流电池局部浓差研究与优化

Study and Optimization of Local Concentration Difference in All-iron Redox Flow Batteries

针对铁基液流电池电堆内部的交趾流道结构对电解液局部浓度不均及其导致的浓差极化问题进行了探讨。尽管交趾流道设计显著优化了整体的浓差极化现象,但局部区域仍然存在较大的浓度梯度和由此引发的浓差极化问题,这对电堆的整体性能产生了不利影响。为了进一步减少这种浓度梯度的影响并提升电堆能效,聚焦于改善电堆中间区域的浓度分布变化及端板结构的设计。通过电化学仿真分析的方法,对改进措施进行了研究与优化,旨在实现电堆性能的提升与改进。

This study conducts an in-depth investigation into the impact of interdigitated flow channel structures within iron-based redox flow battery stacks on local non-uniformity of electrolyte concentration and the resulted concentration overpotential issues.While the interdigitated flow channel design has notably improved the overall concentration overpotential phenomenon,substantial concentration gradients persist in localized regions,thereby giving rise to considerable concentration overpotential problems that negatively affect overall performance of the stack.To further mitigate the influence of these concentration gradients and enhance the stack's efficiency,this paper focuses on improving the variation in electrolyte concentration distribution within the middle region of the stack as well as optimizing the design of end-plate structures.By employing electrochemical simulation analysis techniques,a series of improvement measures have been systematically examined and optimized with the aim of achieving substantive enhancement and improvement in battery stack performance.