Determining the Limiting Current Density of Vanadium Redox Flow Batteries

Jen-Yu Chen, Chin-Lung Hsieh, Ning-Yih Hsu, Yi-Sin Chou and Yong-Song Chen
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Jen-Yu Chen: Advanced Institute of Manufacturing with High-tech Innovation and Department of Mechanical Engineering, National Chung Cheng University, No. 168, University Rd., Minhsiung Township, 62102 Chiayi, Taiwan
Chin-Lung Hsieh: Institute of Nuclear Energy Research, Atomic Energy Council, No. 1000 Wenhua Rd., Jiaan Village, Longtan Township, 32546 Taoyuan, Taiwan
Ning-Yih Hsu: Institute of Nuclear Energy Research, Atomic Energy Council, No. 1000 Wenhua Rd., Jiaan Village, Longtan Township, 32546 Taoyuan, Taiwan
Yi-Sin Chou: Institute of Nuclear Energy Research, Atomic Energy Council, No. 1000 Wenhua Rd., Jiaan Village, Longtan Township, 32546 Taoyuan, Taiwan
Yong-Song Chen: Advanced Institute of Manufacturing with High-tech Innovation and Department of Mechanical Engineering, National Chung Cheng University, No. 168, University Rd., Minhsiung Township, 62102 Chiayi, Taiwan

Energies, 2014, vol. 7, issue 9, 1-11

Abstract: All-vanadium redox flow batteries (VRFBs) are used as energy storage systems for intermittent renewable power sources. The performance of VRFBs depends on materials of key components and operating conditions, such as current density, electrolyte flow rate and electrolyte composition. Mass transfer overpotential is affected by the electrolyte flow rate and electrolyte composition, which is related to the limiting current density. In order to investigate the effect of operating conditions on mass transport overpotential, this study established a relationship between the limiting current density and operating conditions. First, electrolyte solutions with different states of charge were prepared and used for a single cell to obtain discharging polarization curves under various operating conditions. The experimental results were then analyzed and are discussed in this paper. Finally, this paper proposes a limiting current density as a function of operating conditions. The result helps predict the effect of operating condition on the cell performance in a mathematical model.

Keywords: all-vanadium flow battery; state of charge ( SOC ); limiting current density; mass transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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