Cross-linked polymeric material

The patent employs a porous polymeric membrane with controlled porosity to physically block polysulfide transport while allowing ion passage. The porous structure provides a size-exclusion mechanism where the pore dimensions are optimized to prevent polysulfide molecules from migrating between electrodes, thereby eliminating the shuttling effect that causes parasitic reactions and electrode erosion.

The invention uses a composite membrane structure combining polymeric matrix material with functional additives or layered components. This composite approach integrates multiple functions: the polymeric base provides mechanical strength and ion conductivity, while incorporated functional layers or modifiers actively suppress polysulfide dissolution and transport, creating a synergistic system that simultaneously enables ion transport and blocks harmful polysulfide shuttling.

The patent applies local quality by creating regions of different pore sizes and chemical properties within the membrane structure. The membrane contains localized functional zones with specific pore dimensions optimized for ion transport, while other localized regions possess chemical characteristics that selectively interact with and block polysulfide molecules. This spatial differentiation of properties allows simultaneous optimization of ion conductivity and polysulfide blocking.

The invention utilizes parameter changes by systematically varying membrane properties such as pore size distribution, cross-linking density, and functional group concentration. By adjusting these parameters, the membrane achieves an optimal balance where pore dimensions and chemical environment favor ion transport while creating energy barriers or steric hindrance that prevent polysulfide migration, thus decoupling ion conductivity from polysulfide transport.