Coupling Antimony Nanoclusters and Tungsten Nitride With Strong Interaction as a Remarkable Bidirectional Electrocatalyst Toward Robust Lithium‐Sulfur Batteries

The pursuit of high‐efficiency electrocatalysts that are capable of accelerating the sluggish redox reaction kinetics of lithium polysulfides (LiPSs) still remains a grand challenge in lithium‐sulfur (Li─S) batteries. Herein, a novel electrocatalyst with ultrasmall antimony nanoclusters (Sb NCs) anchored on tungsten nitride (W 5 N 4 ) support (denoted as Sb NCs/W 5 N 4 ) with strong metal‐support interaction is elaborately designed. Experimental results and theoretical calculations reveal that the Sb NCs/W 5 N 4 electrocatalyst showcases strong chemical adsorption capability and excellent catalytic activity toward LiPSs. Benefiting from the multiple advantages, the Sb NCs/W 5 N 4 modified separators can efficiently accelerate the LiPS conversion, suppress the shuttle effect, facilitate the lithium ion transportation, and prevent lithium dendrite growth. Impressively, significantly improved Li─S battery performances are achieved, including high specific discharge capacity (1439.4 mAh g −1 at 0.1 C), remarkable rate capability (763.1 mAh g −1 at 5 C), and stable long‐term cycling stability (0.058% capacity decay per cycle at 1 C over 500 cycles). Furthermore, a satisfactory areal capacity of 4.75 mAh cm −2 is obtained at high sulfur loading (6.1 mg cm ‒2 ) and lean electrolyte (8.2 µL mg −1 ). This work presents an important perspective for the rational development of high‐efficiency electrocatalysts toward robust Li─S batteries and other catalysis applications.