New zinc-iodine flow energy storage battery -Lithium - Ion Battery Equipment

New zinc-iodine flow energy storage battery technology -Lithium - Ion Battery Equipment

As a new type of electrochemical energy storage technology, flow battery is one of the preferred technologies for large-scale energy storage of clean energy. Recently, the Dalian Institute of Chemical Physics, Chinese Academy of Sciences has developed a new type of long-life, self-recoverable zinc-iodine flow battery, which effectively solves the problems of short cycle life, low power density, and discontinuous power generation such as wind and solar power. Stability, uncontrollable and other problems have realized the efficient use of clean energy.(Lithium - Ion Battery Equipment)

Zinc-iodine flow batteries have the advantages of high energy density and high safety, and have broad application prospects. However, like other zinc-based batteries, the "dendrite problem" of the zinc anode has always been the bottleneck of its commercial development path.

According to reports, the zinc negative electrode of the zinc-iodine flow battery will produce irregular zinc dendrites during the continuous charging and discharging process. The dendrites of this "dendritic structure" will continue to grow during the cycle and eventually pierce the battery. The film will cause short circuit of the battery and seriously affect the cycle life of the battery. In addition, the hydrogen evolution problem on the negative electrode side also affects the stability of the electrolyte, resulting in a decrease in the battery cycle performance. The solution to this problem is to use an inexpensive polyolefin porous membrane to replace the expensive perfluorosulfonic acid ion exchange membrane.

The research team led by researcher Li Xianfeng and researcher Zhang Huamin of the Energy Storage Technology Research Department of the Dalian Institute of Chemistry, Chinese Academy of Sciences found that the polyolefin porous structure of the zinc-iodine flow battery is filled with oxidized electrolyte, which can dissolve the electrolyte generated during the charging and discharging process. Zinc dendrites can realize the "self-recovery" of the battery, thereby solving the problem of poor battery cycle life caused by zinc dendrites.

It is understood that during the charging process of the battery, the zinc dendrites of the negative electrode will continue to grow forward until the piercing film grows to the positive side, causing the battery to short circuit, but then the oxidized electrolyte of the positive electrode will be connected with the short circuit. The zinc dendrite undergoes a chemical reaction, and the zinc dendrite is slowly dissolved, and finally the short-circuit phenomenon of the battery disappears and the normal performance is restored.

To prove the practicality of the system, the research team successfully integrated a kilowatt-level stack, which operates stably at 80mA/cm2 for more than 300 cycles, with a stable energy efficiency of 80%, showing good reliability. In addition, the battery also has the characteristics of low cost, high conductivity, strong stability, and high operating current density.

Relevant personnel said that the zinc-iodine flow battery is still in the early stage of research, and its practical application and industrialization can be promoted after further improving its reliability under high current density.



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