多孔聚乙烯增强型离子交换膜的制备及全钒液流电池性能研究OA

The industrialization of all-vanadium flow batteries(VFB)is currently hindered by the inherent trade-off between proton conductivity and vanadium ion rejection in ion exchange membrane materials.To address this challenge,a novel membrane architecture was innovatively proposed by constructing a composite membrane loaded with S-SN nanosheets.The performance of the composite membrane was systematically evaluated through micro-morphology characterization,physicochemical analyses including proton conduction and mechanical strength,as well as battery polarization behavior and constant-current discharge stability tests.The results demonstrate that the prepared composite membrane achieves a coulombic efficiency of 96.4%and an energy efficiency of 76.81%at a high current density of 200 mA/cm2.After 500 cycles,the membrane exhibits excellent cycling stability with a capacity retention of 74.91%.By precisely regulating the membrane structure,this innovative design successfully resolves the balance dilemma of ion-selective transport,providing a new strategy for developing cost-effective and stable energy storage membranes.