The development of universal strategies for synthesizing two-dimensional (2D) organic materials is crucial to expanding their structural diversity and exploring their applications in fields such as energy storage and catalysis. Recently

Geng

et al.

proposed a dynamic microinterfacial polymerization for the synthesis of 2D polymer sheets. This method features facile operation

as 2D polymer sheets (designated as PEO-BTA) can be prepared

via

simple stirring of immiscible solutions of poly(propylene glycol)bis(2-aminopropyl ether) in an ionic liquid and 1

3

5-benzenetricarbonyl trichloride in

n

-hexane. 2D PEO-BTA sheets exhibit excellent processability. They can be chemically modified with sodium hydride to yield a material with high Na

+

conductivity (designated as PEO-BTA-Na) or physically composited with HKUST-1

a prototypical metal-organic framework

to form 2D composite sheets (MOF@PEO-BTA-Na) while maintaining their inherent 2D morphology. The resulting 2D sheets can be readily assembled into free-standing membranes

via

vacuum filtration. Upon absorption of a liquid electrolyte

these membranes function as quasi-solid-state electrolytes (QSSEs) for sodium metal batteries. Notably

the MOF@PEO-BTA-Na QSSE exhibits an ionic conductivity of 2.80 mS·cm

-1

and a sodium ion transference number of 0.95

which

outperform those reported for QSSEs in the literature. Sodium metal batteries assembled with MOF@PEO-BTA-Na QSSE exhibit exceptional electrochemical performance in terms of interfacial stability

rate capability

and cycling lifespan. The dynamic microinterfacial polymerization thus holds great potential for the scalable synthesis of diverse 2D polymer materials

while opening a new avenue for the preparation of high-performance QSSEs.