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The battery can be self-recovery after a short circuit.
- Jul 05, 2018 -

Recently, A new type of zinc iodine liquid battery technology has been developed by Dalian Chemical Institute of Chinese Academy of Sciences. This magical battery that can “return to life” is expected to be used as a large-scale energy storage technology to solve the current problem of unstable and unstable power generation such as wind energy and solar energy, and to achieve efficient use of clean energy.

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  As a new type of electrochemical energy storage technology, zinc iodine flow battery adopts high specific capacity and high activity zinc ion as negative electrode active material, which has the advantages of high energy density and high safety. In addition, the zinc iodine liquid stream also uses the high specific capacity and high working voltage of the iodine electric pair to do the positive active electric pair, which further improves the overall energy density of the battery and presents a broad application prospect. However, like other zinc-based batteries, the "dendritic problem" of zinc anodes is a major obstacle to its commercial development.

  During the continuous charging and discharging process, the zinc negative electrode will produce irregular zinc dendrites. The dendrites of this "tree structure" will grow continuously during the cycle, eventually piercing the membrane of the battery, causing short circuit of the battery and seriously affecting the cycle life of the battery.

  How to suppress zinc dendrites? Researchers have come up with a way to pass the membrane structure and electrolyte optimization so that the resulting zinc dendrites cannot pass through the membrane; or some of the zinc dendrites that have passed through the membrane are automatically eliminated. This new idea seems to be the opposite. In fact, it is a trend that provides a new way to improve the stability of the anode of zinc-based batteries. Under the guidance of this idea, scientists from the Institute of Energy Storage Technology of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences have developed the above-mentioned long-life self-recoverable zinc-iodine flow battery technology through the use of inexpensive polyolefin porous membranes and high-stability electrolysis. Liquid, which achieves long-term cycling of the battery and self-recovery after short-circuiting of the battery.

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  This new battery has many advantages. The most amazing thing is that it is durable and can be "resurrected" by itself. During the charging process, the pore size of the polyolefin porous membrane is filled with the positive electrode electrolyte in an oxidized state. When the zinc dendrites grow into the pores of the membrane pores, the electrolyte in the oxidized state dissolves the zinc dendrites, thereby preventing the zinc dendrites from being formed. The battery is short-circuited to achieve the long life cycle of the battery.

  According to reports, the research team further amplified the single-cell battery and assembled a kilowatt-class stack. The reactor can still operate stably, and the energy efficiency is maintained at about 80%. It still has the characteristics of short-circuit recovery, which proves the reliability and practicability of the system.