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Application Case
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New progress in research on high-performance vanadium flow battery enerπgy storage technology
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Release time:
2024-03-13 17:53
The all vanadium flow battery energy storage technology ac∏hieves the storage and release of electrical energy through the mutual coαnversion of metal vanadium ions with different valence states. Its inherent s≠afety, flexible design,
The all vanadium flow battery energy storage technology achieves the s♥torage and release of electrical energy through the mutual c±onversion of metal vanadium ions with different valence states. It's inherent safety, flexible design, and high maturity make it the preferred e•lectrochemical energy storage technology route in the¥ long-term energy storage field of the national power system u<nder the dual carbon strategy.
As a key research and development project supported by the 14th Five Year Plan £of China, the demonstration of energy storage technology a★nd application of the new generation 100MW all vanadiu$m flow battery has put forward higher performance requirements for the o®peration of high-performance all vanadium flow battery energy storage s¥ystems. As the medium for the electrochemical redox reaction of vanadium ions, ←the mass transfer and activation characteristics of the electrode system directly determin&e the conversion efficiency of all vanadium flow batteries. Therefore, devel€oping electrode structure optimization strategies and material control methods suitable fo≥r engineering applications is the foundation and core for achieving high-performance opera£tion of all vanadium flow batteries.
Recently, the corrosion electrochemistry research group of the Center for Materi©al Corrosion and Protection, Institute of Metals, Chinese Academy of Science↕s has made a series of new progress in the research ¥field of high-performance all vanadium flow battery energy sto™rage technology. On the basis of a deep understanding of the polarization characteristicφs of batteries, researchers have taken the mass transfer characteristics and electrochemical activity of electrode systems as the starting point, aσnd engineering applications as the guidance. By introducing flow field optimization design₽ and electrode modification regulation, they have significantly reduced the co→ncentration polarization and activation polarization of batte<ries, achieving high-performance long cycle operation of al♥l vanadium flow batteries, The relevant research results have been published succ↑essively in the Chemical Engineering Journal and Journal of Materials Chemistry A. Master&#≤39;s students Hao Huanhuan and Zhang Qi'an are th<e first authors of the paper, and Tang Qian is the corresponding author.
The positive and negative electrodes of all vanadium flow batteπries use vanadium ions of different valence states as active substances ↓and aqueous solutions as supporting electrolytes, which have adv♥antages such as environmental friendliness and capacity recover↑y. However, due to the limitations of mass transfer characte<ristics of active substances inside the electrodes and flow resistance, the operation of high-pow er all vanadium flow battery stacks still faces challenges. In response to this issue, researchers↔ combined finite element simulation with experiments and introduced structu∞red flow field design into the electrode system to conduct interna✔l simulation analysis of the battery under the coupling of βmultiple physical fields of mass transfer, transmission rate, and electrochemical reaction (Fig ure 1). They successfully optimized the mass transfer characteristics inside the electrode unde∑r high current density, synergistically reducing the concentration ↔polarization and flow resistance of the battery, Effectively improving the convers×ion efficiency of a single battery under high current density, and dynamic simulation predictiφon of a 32kW stack shows that the conversion efficiency of a constant current operating system at a high current density of 200 mA cm-2 can be significantly improved by about 15% (Figure 2). Relevant research pr<ovides new methods and approaches for the design and development of high-power →stacks, The relevant research results were published in Chemical Engine under theφ title "Regulating flow field design on carbon felt electrode rewards hiεgh power density operation of advanced flow batteries"
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