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This study deals with the facile synthesis of Fe 1− x  S nanoparticle-containing nitrogen-doped porous carbon membranes (denoted as Fe 1− x  S/N-PCMs)  via  vacuum carbonization of hybrid porous poly(ionic liquid) (PIL) membranes, and their successful use as a sulfur host material to mitigate the shuttle effect in lithium–sulfur (Li–S) batteries. The hybrid porous PIL membranes as the sacrificial template were prepared  via  ionic crosslinking of a cationic PIL with base-neutralized 1,1′-ferrocenedicarboxylic acid, so that the iron source was molecularly incorporated into the template. The carbonization process was investigated in detail at different temperatures, and the chemical and porous structures of the carbon products were comprehensively analyzed. The Fe 1− x  S/N-PCMs prepared at 900 °C have a multimodal pore size distribution with a satisfactorily high surface area and well-dispersed iron sulfide nanoparticles to physically and chemically confine the LiPSs. The sulfur/Fe 1− x  S/N-PCM composites were then tested as electrodes in Li–S batteries, showing much improved capacity, rate performance and cycle stability, in comparison to iron sulfide-free, nitrogen-doped porous carbon membranes.

materials advances

Template-synthesis of a poly(ionic liquid)-derived Fe<sub>1−x</sub>S/nitrogen-doped porous carbon membrane and its electrode application in lithium–sulfur batteries

Template-synthesis of a poly(ionic liquid)-derived Fe1−xS/nitrogen-doped porous carbon membrane and its electrode application in lithium–sulfur batteries

Template-synthesis of a poly(ionic liquid)-derived Fe_1−xS/nitrogen-doped porous carbon membrane and its electrode application in lithium–sulfur batteries