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Critical drawbacks, including sluggish redox kinetics and undesirable shuttling of polysulfides (Li₂S_n, n = 4–8), seriously deteriorate the electrochemical performance of high‐energy‐density lithium–sulfur (Li–S) batteries. Herein, these challenges are addressed by constructing an integrated catalyst with dual active sites, where single‐atom (SA)‐Fe and polar Fe₂N are co‐embedded in nitrogen‐doped graphene (SA‐Fe/Fe₂N@NG). The SA‐Fe, with plane‐symmetric Fe‐4N coordination, and Fe₂N, with triangular pyramidal Fe‐3N coordination, in this well‐designed configuration exhibit synergistic adsorption of polysulfides and catalytic selectivity for Li₂S_n lithiation and Li₂S delithiation, respectively. These characteristics endow the SA‐Fe/Fe₂N@NG‐modified separator with an optimal polysulfides confinement–catalysis ability, thus accelerating the bidirectional liquid–solid conversion (Li₂S_n↔Li₂S) and …