On the 23rd, the reporter learned from Changsha University of Science and Technology that the team of Professor Ding Mei and Jia Chuankun of the school, together with Professor Sun Lidong of Chongqing University, Researcher Sun Qijun of the Beijing Institute of Nano Energy and Systems, Chinese Academy of Sciences, and the Institute of Metal Research of the Chinese Academy of Sciences, used electrodeposition. Combined with redox targeted catalysis cross-combination technology, a Prussian blue composite electrode material for large-scale energy storage vanadium flow batteries has been jointly developed, which can significantly improve the power density and energy efficiency of vanadium flow batteries. This new type of electrode material is expected to boost the "quality improvement and cost reduction" of vanadium flow batteries and provide new ideas for its further commercial application. At present, the results have entered the application incubation stage, and this research result has also been published in the famous global engineering technology and materials journal "SMALL".
The urgency of the development and utilization of renewable energy is well known. The rapid development of renewable energy depends on new large-scale energy storage technologies with high safety, low cost and long life. Electrochemical energy storage is an important branch of energy storage technology. Among them, the vanadium flow battery is one of the most promising large-scale energy storage technologies due to its advantages such as long cycle life, safety and reliability, and independent power and capacity. However, to industrialize this type of battery, it is "subject" to battery performance and cost. Electrode material is one of the key materials that determine the power cost and efficiency of vanadium redox battery. At present, the most commonly used electrode materials are carbon felt or graphite felt. This type of electrode material has low catalytic activity for vanadium ions and a low specific surface area, which has become a bottleneck for vanadium flow batteries to "improve quality and reduce costs" and enter commercial applications. Finding highly active and low-cost electrode materials is the focus and focus of research by industry experts.
The research team developed this kind of Prussian blue composite electrode for 3 years, which effectively improved the reaction activity of vanadium ions, thereby significantly improving the power density and energy efficiency of the vanadium redox flow battery. "The power density of the vanadium flow battery assembled with this composite electrode is more than 50% higher than that of the carbon felt electrode. At a current density of 100 mA per square centimeter, the energy efficiency even exceeds 88%." Ding Mei said.
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