Research advances in modifying high-performance lithium‑sulfur battery separator with bimetallic metal-organic frameworks

Lithium‑sulfur batteries (LSBs) are promising candidates for next-generation energy storage systems due to their high theoretical specific capacity (1675 mAh g −1 ). However, practical applications are hindered by the polysulfide (LiPS) shuttle effect and lithium dendrite growth. Metal-organic frameworks (MOFs), with high porosity, tunable pore size, and abundant active sites, are ideal materials for separator modification to suppress LiPS migration. Compared to monometallic MOFs, bimetallic MOFs exhibit superior electrocatalytic activity and ion transport due to synergistic effects. This paper summarizes recent progress in the use of bimetallic metal-organic frameworks for separator modification, emphasizing design strategies, performance optimization, and electrochemical differences with monometallic MOFs based on experimental data. It also analyzes the current limitations of LSB research. To advance commercialization, strategies such as designing multifunctional integrated separators for improved interfacial stability and LiPS confinement, screening bimetallic catalysts to enhance redox kinetics, and optimizing scalable manufacturing processes were proposed. These targeted approaches aim to overcome bottlenecks and accelerate the transition of LSB technology from lab-scale research to real-world applications.