23A battery

　　New zinc-iodine flow 23A battery technology, a magical 23A battery that can "revive"!

　　Recently, the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences has developed a new zinc-iodine flow 23A battery technology. This magical 23A battery that can "revive" is expected to be used as a large-scale energy storage technology to solve the current problems of discontinuous and unstable power generation such as wind power and solar energy, and realize the efficient use of clean energy.

　　As a new type of electrochemical energy storage technology, zinc-iodine flow 23A battery uses high specific capacity and high activity zinc ions as negative electrode active materials, and has the advantages of high energy density and high safety. In addition, zinc-iodine flow also uses iodine electrodes with high specific capacity and high working voltage as positive electrode active electrodes, which further improves the overall energy density of the 23A battery and shows broad application prospects. However, like other zinc-based batteries, the "dendrite problem" of the zinc negative electrode is a major obstacle on its commercial development path.

　　During the continuous charging and discharging process of the zinc negative electrode, irregular zinc dendrites will be generated. This "tree-like" dendrite will continue to grow during the cycle, and eventually pierce the 23A battery membrane, causing the 23A battery to short-circuit, seriously affecting the 23A battery's cycle life.

　　How to suppress zinc dendrites? Researchers have come up with a solution: by optimizing the membrane structure and electrolyte, zinc dendrites cannot pass through the membrane; or some zinc dendrites that have passed through the membrane are automatically eliminated. This new idea seems to go against the grain, but in fact it goes with the flow, providing a new way to improve the stability of the negative electrode of zinc-based batteries. Under the guidance of this idea, scientists from the Energy Storage Technology Research Department of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences have developed the above-mentioned long-life self-recovering zinc-iodine flow 23A battery technology. By using cheap polyolefin porous membranes and high-stability electrolytes, the long-term cycle of the 23A battery and the self-recovery after the 23A battery short circuit are achieved.

　　This new 23A battery has many advantages, the most amazing of which is its strong durability and the ability to "revive" itself. During the charging process, the pores of the polyolefin porous membrane are filled with oxidized positive electrolyte. When zinc dendrites grow into the membrane pores, the oxidized electrolyte can dissolve the zinc dendrites, thereby preventing zinc dendrites from causing 23A battery short circuits and achieving long-life 23A battery cycles.

　　According to reports, the research team further enlarged the single cell and assembled a kilowatt-class stack. The stack can still operate stably, with energy efficiency maintained at around 80%, and still has the characteristic of short-circuit recovery, which strongly proves the reliability and practicality of the system.

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