A composite membrane based on sulfonated polyether ether ketone was prepared and modified by attaching polytetrafluoroethylene nanoparticles to its surface through polydopamine.By adjusting the mass fraction of PTFE nanoparticles,a high-performance composite membrane was obtained.The results indicate that the SPEEK composite membrane exhibits superior ion selectivity and good stability.In the assembled all-vanadium redox flow battery,the coulombic efficiency and energy efficiency reach as high as 99.2％and 85.6％,respectively,at a current density of 100 mA/cm2.The successful modification of the SPEEK membrane with PTFE nanoparticles demonstrates its promising potential for applications in vanadium redox flow batteries.
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