This kind of battery in China can "self repair" after short circuit

　　The battery is most afraid of short circuit. Short circuit makes the battery current too high. Even if it does not explode and fire at high temperature, it will damage the battery structure. In some cases, its service life will be shortened, and in some cases, it will be scrapped directly. But recently, a technology that is not afraid of battery short circuit has emerged. This battery technology can make the battery self repair after short circuit, and is no longer afraid of short circuit.

　　1、 Battery technology not afraid of short circuit

　　Recently, Dalian Institute of Chemistry, Chinese Academy of Sciences has developed a new zinc iodine flow battery technology. This kind of "resurrection" magic battery is expected to be used as a large-scale energy storage technology to solve the problems of discontinuous and unstable power generation such as wind energy and solar energy, and realize the efficient use of clean energy. As a new type of zinc iodine flow battery, Dalian Institute of Chemistry, Chinese Academy of Sciences has recently developed a new zinc iodine flow battery technology. This "dead and alive" magic battery is expected to be used as a large-scale energy storage technology to solve the current unsustainable and unstable problems of wind and solar power generation, and achieve efficient use of clean energy. Zinc iodine flow battery is a new electrochemical energy storage technology. It uses zinc ions with large specific capacity and high activity as the negative active material, which has the advantages of high energy density and high safety. In addition, the iodine pair with high specific capacity and high working voltage is selected as the positive electrode activity pair of zinc iodine liquid flow, which further improves the overall energy density of the battery and has broad application prospects. However, like other zinc based batteries, the "dendrite problem" of zinc anode is a major problem in its commercial development. In the process of continuous charge and discharge of zinc cathode, irregular zinc dendrites will appear. The dendrites of this "tree structure" will continue to grow during the cycle, and eventually pierce the battery film, resulting in short circuit of the battery, which seriously affects the cycle life of the battery.

　　2、 Why the battery can recover itself without fear of short circuit

　　How to inhibit zinc dendrites? Researchers have proposed a method: by optimizing the membrane structure and electrolyte, zinc dendrites can not pass through the membrane; Alternatively, some zinc dendrites through the film can be eliminated automatically. This new idea seems to be contrary, but it is actually in line with the trend. It provides a new way to improve the stability of zinc based battery cathode. Under the guidance of this concept, scientists from the Energy Storage Technology Research Department of Dalian Institute of Chemistry, Chinese Academy of Sciences developed the above long-life self-healing zinc iodine flow battery technology, which uses cheap polyolefin porous membrane and highly stable electrolyte to achieve long-term cycle and self recovery after a short circuit. This new battery has many advantages. The most wonderful thing is that it has strong durability and can "revive" itself. During the charging process, the pore diameter of polyolefin porous membrane is filled with oxidized positive electrolyte. When the zinc dendrites grow in the membrane pores, the oxidation electrolyte can dissolve the zinc dendrites, thus preventing the zinc dendrites from causing short circuit of the battery and realizing the long life of the battery. It is reported that the research team has further expanded the single battery and assembled a kilowatt battery pack. The stack can still operate stably with energy efficiency of about 80%, and has short-circuit recovery characteristics, which strongly proves the reliability and practicability of the system. This battery technology, which is not afraid of short circuit and can recover itself after short circuit, undoubtedly has great application prospects. After it is applied, everyone can enjoy the benefits of technology.

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