Preparation method of composite cation exchange membrane and application of composite cation exchange membrane in iron complex flow battery

Abstract

The invention relates to a preparation method of a composite cation exchange membrane and application of the composite cation exchange membrane in an iron complex flow battery, and belongs to the technical field of flow batteries. Comprising the following steps: S1, adding an inorganic nano material into an organic solvent, and carrying out ultrasonic dispersion at room temperature; s2, coating one side of the surface of the ion exchange membrane with the ultrasonically dispersed inorganic nano material liquid; s3, further spraying a binder solution on the surface of the membrane coated with the inorganic nano material; and S4, assembling the iron complex flow battery, and ensuring that the surface, coated with the inorganic nano material, of the ion exchange membrane faces the negative electrode. The inorganic nano-material layer is sprayed on one side surface, close to the negative electrode, of the ion exchange membrane, a negative electric double-electrode layer is formed in a negative electrode electrolyte and has a repulsive effect on a complex under an alkaline condition, and meanwhile, the inorganic nano-material layer can also inhibit active components in the electrolyte from penetrating through the membrane, so that the coulombic efficiency and the circularity of the alkaline total-iron flow battery are obviously improved.

Images