Efficient Polysulfide Chemisorption in Covalent Organic Frameworks for High-Performance Lithium-Sulfur Batteries

High performance lithium‐sulfur batteries have been successfully constructed by using boronate ester covalent organic frameworks (COFs) as the polysulfide hosts. The adsorption mechanism is ascribed to uniform coexistence of both electron‐rich O and electron‐deficient B atoms that can adsorb Li+ and Sx2−, respectively. In addition, the ordered structure of COFs allows higher heteroatom doping ratio as well as more uniform distribution and redeposition of sulfur, leading to good electrode kinetics.