Development of Integrally Molded Bipolar Plates for All-Vanadium Redox Flow Batteries

Chang, Cheng‐Tao; Chou, Han-Wen; Hsu, Ning-Yih; Chen, Yong-Song

doi:10.3390/en9050350

Cited by 15 publications

(8 citation statements)

References 18 publications

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“…The developed method considerably decreased the ASR of the composite BP without the need for an expanded graphite coating. To reduce the manufacturing cost, Chang et al designed and fabricated an integrally molded BP; however, real testing in a VRFB was not performed.…”

Section: Degradation Of Vrfb Componentsmentioning

confidence: 99%

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

et al. 2019

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Summary The all‐vanadium redox flow battery (VRFB) is emerging as a promising technology for large‐scale energy storage systems due to its scalability and flexibility, high round‐trip efficiency, long durability, and little environmental impact. As the degradation rate of the VRFB components is relatively low, less attention has been paid in terms of VRFB durability in comparison with studies on performance improvement and cost reduction. This paper reviews publications on performance degradation mechanisms and mitigation strategies for VRFBs in an attempt to achieve a systematic understanding of VRFB durability. Durability studies of individual VRFB components, including electrolyte, membrane, electrode, and bipolar plate, are introduced. Various degradation mechanisms at both cell and component levels are examined. Following these, applicable strategies for mitigating degradation of each component are compiled. In addition, this paper summarizes various diagnostic tools to evaluate component degradation, followed by accelerated stress tests and models for aging prediction that can help reduce the duration and cost associated with real lifetime tests. Finally, future research areas on the degradation and accelerated lifetime testing for VRFBs are proposed.

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Section: Degradation Of Vrfb Componentsmentioning

confidence: 99%

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

et al. 2019

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“…During VRFB stack operation, pumps deliver electrolytes into the stack. The electrolytes flow through manifolds connecting the cells and are distributed to each cell through flow channels that connect the manifold and the active areas …”

Section: Introductionmentioning

confidence: 99%

“…The electrolytes flow through manifolds connecting the cells and are distributed to each cell through flow channels that connect the manifold and the active areas. 5 Connecting multiple VRFB stacks, in series or parallel, can meet the voltage and power requirements of a large-scale renewable energy storage system. Although there are multiple stacks in such a system, two recirculation pumps, one on each side, supply the electrolytes through the piping system to all the stacks.…”

Section: ■ Introductionmentioning

confidence: 99%

Locating Shunt Currents in a Multistack System of All-Vanadium Redox Flow Batteries

Chou

Chang

Wei

et al. 2021

ACS Sustainable Chem. Eng.

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An all-vanadium redox flow battery (VRFB) system, with multiple stacks, is typically used for large-scale electrical energy storage applications. In a VRFB system, pumps deliver positive and negative electrolytes, through a piping system, to each stack. Because the electrolytes are electrically conductive, shunt currents can occur within a multicell stack and within the piping system, connecting the stacks due to the voltage differences between cells and between stacks. Shunt currents cause energy loss and are affected by the number of cells in a single stack, the number of stacks, and the piping system dimensions. In this study, we develop a mathematical model, based on Kirchhoff's law, to locate shunt currents in a multistack system. Using this model, we estimate the charge efficiency with various numbers of stacks. The results show that the shunt currents in the central stacks are larger than the currents in other stacks. In addition, the piping system dominates the distribution of the electrolytes, and the shunt currents gradually shift from inside the stack to the piping system.

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“…The efficiency of a VRFB depends on the battery design [8,9], component materials and operating conditions, such as the operating current density and electrolyte flow rate [10]. The electrochemical reaction occurs on the electrode surface at the electrode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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.

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Development of Integrally Molded Bipolar Plates for All-Vanadium Redox Flow Batteries

Cited by 15 publications

References 18 publications

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

A review of all‐vanadium redox flow battery durability: Degradation mechanisms and mitigation strategies

Locating Shunt Currents in a Multistack System of All-Vanadium Redox Flow Batteries

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

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