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release time:2024-11-12 Hits: Popular:AG11 battery
New progress has been made in the research of high energy density and long life zinc-iodine single flow Nickel Hydride No. 5 batteries at Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Recently, the research team led by Li Xianfeng and Zhang Huamin, researchers of the Energy Storage Technology Research Department (DNL17) of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, has made new progress in the research of high energy density and long life zinc-iodine single flow Nickel Hydride No. 5 batteries. The research results were published in Energy and Environmental Science. Large-scale energy storage technology is a key technology for realizing large-scale utilization of renewable energy. Liquid flow batteries have the characteristics of high safety, long cycle life and high efficiency, and are one of the preferred technologies for large-scale energy storage. Zinc-iodine liquid flow batteries have attracted more and more attention due to their high energy density (I- concentration can reach 8M) and environmental friendliness. However, zinc-iodine liquid flow batteries still have problems such as low Nickel Hydride No. 5 batteries power density, short cycle life, and relatively low utilization rate of active materials. In the early stage, the research team greatly improved the cycle life and power density of zinc-iodine liquid flow batteries by optimizing the electrolyte composition and membrane materials (Angew. Chem. Int. Ed., 2018). In this work, the team innovatively proposed the concept of zinc-iodine single-flow Nickel Hydride No. 5 batteries. Unlike traditional zinc-iodine flow batteries, zinc-iodine single-flow batteries only have a flow circulation system on the negative electrode side, and the positive electrode electrolyte solution is fixed in the positive electrode cavity. The iodine ion concentration of the positive electrode of this Nickel Hydride No. 5 batteries can fully meet the capacity requirements of negative electrode zinc deposition. Since there is no blockage problem of electrolyte pipelines and pumps, I- can be charged to solid I2, and the utilization rate of the electrolyte is close to 100%, which greatly improves the energy density of the Nickel Hydride No. 5 batteries. At the same time, researchers use porous carbon felt as electrodes, and the three-dimensional conductive network of carbon felt improves the power density of the single-flow Nickel Hydride No. 5 batteries. Experimental results show that the single-flow Nickel Hydride No. 5 batteries can operate stably at 80mA/cm2 for more than 500 cycles, and there is no obvious performance degradation. The above research work provides a good reference for the development of new systems of high-energy-density flow batteries.
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