The two key problems for the industrialization of Li−S batteries are the dendrite growth of lithium anode and the shuttle effect of lithium polysulfides (LiPSs). Herein, we report the Janus separator prepared by coating anionic Bio-MOF-100 and its derived single-atom zinc catalyst on each side of the Celgard separator. The anionic metal−organic framework (MOF) coating induces the uniform and rapid deposition of lithium ions, while its derived single-atom zinc catalyzes the rapid transformation of LiPSs, thus inhibiting the lithium dendrite and shuttle effect simultaneously. Consequently, compared with other reported Li−S batteries assembled with single-atomic catalysts as separator coatings, our SAZ-AF Janus separator showed stable cyclic performance (0.05% capacity decay rate at 2 C with 1000 cycles), outstanding performance in protecting lithium anode (steady cycle 2800 h at 10 mAh cm −2 ), and equally excellent cycling performance in Li−SeS 2 or Li−Se batteries. Our work provides an effective separator coating design to inhibit shuttle effect and lithium dendrite.

Lithium metal batteries (LMBs) offers the highest theoretical capacity (3860 mAh g−1), but has suffered from the issue of formation of lithium dendrite during device operation owing to inhomogeneous growth...