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首页> 外文期刊>Journal of Energy Storage >Performance enhancing stack geometry concepts for redox flow battery systems with flow through electrodes
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Performance enhancing stack geometry concepts for redox flow battery systems with flow through electrodes

机译：具有流过电极的氧化还原液流电池系统的性能增强堆叠几何概念

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摘要

As redox flow batteries are being commercialised and demonstrated in a range of energy storage applications, further cost reductions are needed to make these batteries economically viable. In reducing cost, one important aspect is to minimise concentration polarisation, which allows for an increase in the power density of the battery stack. To make significant advances in increasing the power density of flow batteries it is critical to overcome the conventional design approach and explore new design concepts that alleviate the constraints in existing flow battery systems. This study investigates flow-through electrodes with new geometries that increase the velocity from inlet to outlet within cells. This velocity increase can address mass transport limitations, improving the delivery of electrochemical species to reactive sites on the electrode/electrolyte interface under varying states of charge. Three dimensional hydraulic-electrochemical coupled models were used to simulate different stack geometries; a rectangular geometry, a trapezoidal geometry and a radial geometry. The trapezoidal and radial geometries can accelerate the electrolyte during each pass in the battery stack. A new geometric stack arrangement is also proposed, which can deliver a higher power output with radially displaced cells.
机译：随着氧化还原液流电池的商业化并在一系列储能应用中得到证明，需要进一步降低成本以使这些电池在经济上可行。在降低成本方面，一个重要方面是使浓度极化最小化，这可以增加电池组的功率密度。为了在提高液流电池的功率密度方面取得重大进步，克服常规设计方法并探索减轻现有液流电池系统限制的新设计概念至关重要。这项研究研究了具有新几何形状的流通式电极，这些电极可增加电池内从入口到出口的速度。这种速度的增加可以解决物质传输的局限性，从而改善了在变化的电荷状态下电化学物质向电极/电解质界面上反应位点的传递。三维液压-电化学耦合模型用于模拟不同的烟囱几何形状。矩形几何形状，梯形几何形状和径向几何形状。梯形和径向的几何形状可以在电池堆中的每次通过期间使电解质加速。还提出了一种新的几何堆叠结构，其可以在径向移位的电池单元中提供更高的功率输出。

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