Effect of Compression Ratio of Graphite Felts on the Performance of an All-Vanadium Redox Flow Battery

Chin-Lung Hsieh, Po-Hong Tsai, Ning-Yih Hsu and Yong-Song Chen
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Chin-Lung Hsieh: Institute of Nuclear Energy Research, Atomic Energy Council, No. 1000 Wenhua Rd., Jiaan Village, Longtan District, Taoyuan City 32546, Taiwan
Po-Hong Tsai: Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, No. 168, University Rd., Minhsiung Township, Chiayi County 62102, Taiwan
Ning-Yih Hsu: Institute of Nuclear Energy Research, Atomic Energy Council, No. 1000 Wenhua Rd., Jiaan Village, Longtan District, Taoyuan City 32546, Taiwan
Yong-Song Chen: Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations, National Chung Cheng University, No. 168, University Rd., Minhsiung Township, Chiayi County 62102, Taiwan

Energies, 2019, vol. 12, issue 2, 1-11

Abstract: All-vanadium redox flow batteries (VRFBs) are considered promising candidates for large-scale energy storage systems due to their flexible power scale design, high efficiency, deep discharge, long cycle life and environmental friendliness. The performance and efficiency of a VRFB is affected by many factors, including component materials, battery design, electrolyte composition and operating conditions. Among the key components, porous electrodes play a key role, as the electrochemical reaction occurs on the fiber surface of the electrode. As such, many studies have focused on improving reaction kinetics by modifying the surface of the electrode. In this work, the effect of varying the compression ratio (CR) of graphite felts on the performance and efficiency of a VRFB are investigated. The impedance of a single VRFB under varying CRs of graphite felts at various operating conditions were also measured. The results suggest that performance of a VRFB increases with increasing CR due to the decrease of area resistance and concentration overpotential. The porous electrode compressed from 6.5 to 4 mm demonstrates the optimal energy efficiency of 73% at the operating current density 80 mA cm −2 and electrolyte flow rate 100 mL min −1 .

Keywords: all-vanadium redox flow battery; graphite felt; compression ratio; electrode (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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