Recently, researchers Li Xianfeng and Zhang Huamin of the Energy Storage Technology Research Department of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences led the research team to make new progress in the research of ion-conducting membranes for alkaline zinc-based flow batteries. The research results were published in "Advanced Functional Materials".
Zinc-based flow battery energy storage technology uses abundant zinc as the negative electrode active material, which has the characteristics of low cost, high safety, high open circuit voltage and environmental friendliness, and has good application prospects in the field of distributed energy storage. The key problem of zinc-based flow batteries is the dendrite, accumulation and shedding of zinc anodes. The film plays an important role in regulating the zinc deposition morphology and inhibiting the growth of dendrites to improve the reliability of battery operation.
Previously, the research team adjusted the zinc deposition direction and morphology by adjusting the negative charge properties of the porous ion-conducting membrane, which greatly improved the surface capacity and cycle stability of the zinc-based flow battery.
In this study, the researchers selected a commercial polyethylene porous membrane as the base membrane, and introduced the functionalized hollow spheres into the base membrane in situ to prepare a mixed matrix porous membrane. The hollow spheres greatly shortened the ion transmission path and significantly improved the The power density of the battery. In addition, the selected hollow spheres have excellent stability in alkali, and the resulting membrane has excellent mechanical properties, which can effectively inhibit the growth of zinc dendrites and further improve the cycle stability of zinc-based flow batteries. The alkaline zinc-iron flow cell assembled with the membrane material has an energy efficiency of over 88% under 80mA / cm2 charge and discharge conditions. (Reporter Liu Wansheng correspondent Chang Nana)
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