As a new type of electrochemical energy storage technology, zinc-iodine flow battery uses high specific capacity and high activity zinc ions as the negative electrode active material, which has the advantages of high energy density and high safety. In addition, the zinc-iodine flow also selects the iodine pair with high specific capacity and high working voltage as the positive electrode active pair, which further improves the overall energy density of the battery and shows a broad application prospect. However, like other zinc-based batteries, the "dendrite problem" of the zinc anode is a major difficulty in its commercial development.

　　During the continuous charging and discharging process of the zinc negative electrode, irregular zinc dendrites will be produced. This kind of "tree-like structure" dendrites will continue to grow during the cycle, and eventually pierce the battery membrane, causing a short circuit of the battery, which will seriously affect the battery. Cycle life.

　　How to suppress zinc dendrites? Researchers have come up with a way: through the optimization of the membrane structure and electrolyte, the zinc dendrites produced 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, but in fact it is taking advantage of the trend, and it provides a new way to improve the stability of the anode of zinc-based batteries. Under the guidance of this idea, scientists from the Energy Storage Technology Research Department of Dalian Institute of Chemical Technology have developed the above-mentioned long-life, self-recoverable zinc-iodine flow battery technology, through the use of cheap polyolefin porous membranes and high-stability electrolysis Liquid, to realize the long-term cycle of the battery and self-recovery after the battery is short-circuited.

　　This new battery has many advantages, the most amazing thing is that it is durable and can "resurrect" itself. During the charging process, the pores of the polyolefin porous membrane are filled with oxidized cathode electrolyte. When the zinc dendrites grow into the membrane pores, the oxidized electrolyte can dissolve the zinc dendrites, thereby preventing the zinc dendrites from being caused. The battery is short-circuited to realize the long life cycle of the battery.

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