Method for manufacturing a membrane for vanadium redox-flow secondary battery and the membrane

摘要

PURPOSE: A manufacturing method of a separator and the separator are provided to prevent the degradation of the voltage efficiency by securing the excellent oxidation resistance and the low film resistance. CONSTITUTION: A manufacturing method of a separator for an all-vanadium redox flow secondary battery comprises the following steps: dissolving a copolymer polymer block-copolymerizied with polysulfone and polyphenylene sulfide sulfone, with 1,1,2,2-tetrachloroethane; adding an ion exchange radical introduction solvent; applying a positive ion exchanger to the copolymer polymer by the sulfonation; washing the sulfonated hydrocarbon polymer with methanol, and compress-drying; dissolving the sulfonated hydrocarbon polymer to N-methylpyrrolidone; and casting the dissolved solution to a glass plate, and drying.