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Singapore professor develops safer flow R03 Carbon battery
Professor Wang Qing's research group at the National University of Singapore has successfully developed a new type of flow lithium-air battery. This battery separates the generation and decomposition of lithium peroxide from the cathode of the battery through redox molecules dissolved in the flowing electrolyte, effectively avoiding blockage and passivation of electrode pores. This new battery can maintain the high energy density of lithium-air batteries while having the safety and flexibility of traditional flow batteries. The research work was published in Chemical Letters of the Royal Society of Chemistry.
Due to its high energy density (about 10 times that of lithium-ion batteries), lithium-air batteries have attracted the attention of many researchers in recent years, but poor electrode kinetics lead to very large polarization of the battery. Therefore, many researchers focus on modifying and optimizing catalysts on cathode materials. Currently, the most studied catalysts for lithium-air batteries include carbon-based materials, noble metal materials, transition metal oxide materials, titanium-based materials, etc. But these materials still have inherent flaws. For example, when the surface of the catalyst material is covered by the discharge product lithium peroxide, the catalyst will lose its catalytic effect. Therefore, soluble catalysts become a way to solve the above problems. Professor Wang Qing's scientific research team uses soluble catalysts to integrate lithium-air batteries into liquid flow systems. During operation, the battery's discharge products are generated in a separate air diffusion tank, thus solving these problems. This new battery system not only has high energy density, but also has good safety and flexibility of use.
In addition to the above-mentioned research and development of flow lithium-air batteries, this research team has also proposed and demonstrated flow lithium-ion batteries in recent years. The working mode of this battery is similar to that of traditional flow batteries, but because the energy is stored in the lithium-ion battery material, its energy density can reach more than 10 times that of vanadium flow batteries, and it is safer than lithium-ion batteries. sex.
Flow lithium-air batteries and flow lithium-ion batteries have good application prospects in large-scale energy storage. First of all, its high energy density pushes the liquid flow energy storage system to a new limit, which can greatly reduce the space occupation; secondly, the battery has very good safety and can be charged quickly, which will make it suitable for electric vehicles. Automotive applications have obvious advantages; in addition, the battery can be produced in a modular manner. These advantages make it significantly competitive in many fields. Therefore, flow lithium-air batteries and flow lithium-ion batteries will occupy an important position in the future energy storage market.
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