大化所成功制备超薄聚合物膜材料

Core Insights - A new interface crosslinking strategy has been developed for ion-selective membranes used in flow batteries, resulting in a high stability ultra-thin polymer membrane with a thickness of only 3 micrometers, which enhances the working current density of all-vanadium flow batteries to 300 milliamps per square centimeter [1][2] Group 1: Research Findings - The polymer ion-selective membrane is favored in the market due to its low cost and ease of large-scale production, but traditional methods often lead to irregular pore structures that hinder precise separation of active materials and charge carriers [1] - The new membrane features a pore size distribution between 1.8 to 5.4 angstroms, similar to inorganic nanoporous materials, allowing for precise screening of active materials and rapid conduction of charge carriers [2] - The robust covalent crosslinking network within the separation layer enhances the mechanical stability of the membrane, demonstrating good mechanical strength even at a reduced thickness of 3 micrometers, outperforming commercial Nafion 212 membranes in tensile strength and hardness [1] Group 2: Application and Performance - The membrane was tested in an all-vanadium flow cell, achieving an energy efficiency exceeding 80% at a high current density of 300 milliamps per square centimeter [2] - The ultra-thin membrane also shows excellent performance in alkaline zinc-iron flow batteries and aqueous organic flow batteries under high current densities [2] - The universality of the interface crosslinking strategy was further validated by varying the type of crosslinking agent used [2]