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Anion exchange membrane used for highly-durable redox flow battery having low ion permeablility for vanadium ion and redox flow battery including the same
Anion exchange membrane used for highly-durable redox flow battery having low ion permeablility for vanadium ion and redox flow battery including the same
The present invention relates to a vanadium ion low-permeability anion exchange membrane for a redox flow battery. The vanadium ion low-permeability anion exchange membrane for a redox flow battery includes: a porous polymer base material; and a polymer electrolyte depressed in an air hole of the porous polymer base material. The porous polymer base material is a porous polyvinylidene fluoride (PVDF) membrane with 70-80% of opening volume, 0.2-0.6 m of an air hole size, and 70-80 m of the thickness. The polymer electrolyte is formed as the porous polymer base material is cross-linked and polymerized with a solution after the porous polymer base material is impregnated in the solution containing an electrolyte monomer of tetravalent ammonium salt having a cation group, an acrylamide cross linking agent, and an initiator. According to the present invention, the vanadium ion low-permeability anion exchange membrane for a redox flow battery can minimize crossover of a vanadium ion, which occurs between a positive electrolyte and a negative electrolyte in the redox flow battery and, therefore, can be usefully used to manufacture the redox flow battery having performance with remarkably improved energy efficiency and durability in comparison with an existing ion exchange membrane such as Nafion.
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