In Situ Synthesis of Sulfur Host with Chemisorption and Electrocatalytic Capability toward High‐Performance Lithium–Sulfur Batteries

Lithium–sulfur (Li–S) batteries have been attracting much attention because of their outstanding theoretical capacity and abundance of sulfur. However, there are still some drawbacks, in which the shuttling of soluble polysulfides in the charge and discharge process severely limits its practical application. Herein, new 3D interconnected carbon nanotubes (CNTs) embedded with in situ grown cobalt disulfide (CoS2) nanoparticles (CoS2/CNTs) as an advanced matrix for sulfur electrode are developed. The 3D interconnected CNTs exhibit a good conductivity and a highly porous structure, which are promising for fast electron transport and buffering volume expansion. Furthermore, abundant CoS2 nanoparticles not only help to chemically trap the soluble polysulfides but also dynamically enhance polysulfide redox reactions. Because of these synchronous advantages, enhanced electrochemical performances including high capacity, superior redox reaction kinetics, and excellent cycling stability are achieved. CoS2/carbon nanotubes (CNTs) is obtained by an in situ synthesis method and used as an advanced sulfur host. The interconnected CNTs facilitate electron transport and mitigate volume expansion of the cathode. The CoS2 nanoparticles provide a chemical trap for soluble polysul‐fides and enhance their redox reactions. Because of such synchronous advantages, the CoS2/CNTs‐based sulfur cathode delivers enhanced electrochemical performances.