Tien-Fu Yang , Yu-Kai Chen , Cong-You Lin , Wei-Mon Yan , Saman Rashidi
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Abstract
Background
Energy storage is a critical area in today's world, despite the shift towards renewable energy sources. The instability and intermittency of energy remain highly challenging. Vanadium redox flow batteries (VRBs), with their flexible design, fast response time, and long cycle life, offer an efficient energy storage solution. Over the past few years, they have been widely applied and developed in large-scale energy storage systems. VRBs offer higher safety compared to lithium batteries. However, previous studies on these batteries have primarily focused on the influence of material usage on battery performance, with the design of flow field structures also being a key factor.
Methods
In this study, models of VRBs with interdigitated, parallel, and serpentine (1, 2, 4 channels) flow channels were established. The study analyzes the effects of different flow channels, electrolyte flow rates, and applied current densities on the battery performance. Additionally, it explores the performance of batteries with different geometric configuration parameters of the flow channels and rib width ratios.
Significant Findings
The results indicate that the performance of batteries with a serpentine channel (single-channel) surpasses those with serpentine two-channels, serpentine four-channels, interdigitated, and parallel flow channel designs. It was found that the geometry ratio of Wc:Wr = 1:2 for flow channels and rib widths is the optimal structural combination among the three geometric configurations. Additionally, it is observed that at low electrolyte flow rates, the flow rate has a significant impact on the performance of these batteries. This phenomenon is caused by the ion diffusion rate inside the electrode being unable to meet the electrochemical reaction rate.
期刊介绍：
Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.
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