AbstractThe dissolution/shuttling of sodium polysulfides, coupled with sodium dendrites growth, severely compromises the lifespan and stability of room temperature sodiumāsulfur (RT NaāS) batteries. Herein, it proposes employing a functionalized porous ZIFābased membrane (PZM) to address these two challenges. First, the metal ions embedded within the zeolitic imidazolate framework chemically bind with polysulfide anions, curtailing their detrimental shuttling. Second, the tailored porous structure of the membrane ensures a selective and uniform pathway for sodium ions, significantly reducing nonāuniform deposition and curbing dendritic sodium growth. Third, the intrinsically nonācombustible nature of the ZIFābased membrane acts as a fortification against thermal outbursts and electrolyte decomposition. Implementing this polysulfideāresistant, dendriteāinhibiting and flameāretardant PZM with a standard S/C cathode leads to the creation of a robust separator with lean electrolyte RT NaāS battery. This configuration may impart a novel perspective for the advancement and enhancement of RT NaāS battery systems.