Ion-conducting porous membrane for vanadium flow battery, preparation method thereof and use thereof

The invention discloses an ion-conducting porous membrane for a vanadium flow battery (VFB), a preparation method thereof and a use thereof. The porous membrane is used in the VFB, and is prepared bya casting solution containing an organic polymer resin having a high mass concentration. By adding a surfactant, the exchange rate of a solvent and a non-solvent is changed during a membrane formationprocess of the porous membrane, thereby affecting the final structure of the porous membrane. The method controls the pore size of the prepared porous membrane by controlling the addition of the surfactant, thereby increasing the proton conductivity of the membrane and balancing the vanadium ion selectivity and high proton conductivity of the membrane while maintaining high vanadium ion selectivity. After introducing the surfactant, the porous membrane is greatly improved in hydrophilicity, the interface resistance between the porous membrane and an electrolyte is reduced, and the polarization effect of the battery is