Nitrogen‐Doped Porous Carbon as High‐Performance Cathode Material for Lithium‐Sulfur Battery

Abstract Lithium sulfur is considered as one of the most potential candidate cathode material using in high‐energy lithium ion batteries. In this work, the N‐doped porous carbon spheres with an appropriate N doping (4.33 wt%) were synthesized by Pyrrole through the sulfuric acid triggered polymerization and carbonized directly. The diameter of obtained N‐doped porous carbon spheres was in the range of 100–500 nm, with the pore size of 2–20 nm. Nitrogen‐doped carbon/Sulfur cathode with 61.8 wt% sulfur content exhibits excellent performance in high‐energy lithium sulfur battery. The specific capacity reached 1660 mAh g −1 at 0.05 C and about 500 mAh g −1 at 2 C.