A Supramolecular Complex of C 60 –S with High‐Density Active Sites as a Cathode for Lithium–Sulfur Batteries

The well‐known “shuttle effect” of the intermediate lithium polysulfides (LiPSs) and low sulfur utilization hinder the practical application of lithium–sulfur (Li–S) batteries. Herein, we describe a novel C 60 –S supramolecular complex with high‐density active sites for LiPS adsorption that was formed by a simple one‐step process as a cathode material for Li–S batteries. Benefiting from the cocrystal structure, 100 % of the C 60 molecules in the complex can offer active sites to adsorb LiPSs and catalyze their conversion. Furthermore, the lithiated C 60 cores promote internal ion transport inside the composite cathode. At a low electrolyte/sulfur ratio of 5 μL mg −1 , the C 60 –S cathode with a sulfur loading of 4 mg cm −2 exhibited a high capacity of 809 mAh g −1 (3.2 mAh cm −2 ). The development of the C 60 –S supramolecular complex will inspire the invention of a new family of S/fullerenes as cathodes for high‐performance Li–S batteries and extend the application of fullerenes.