Confining Sulfur in N‐Doped Hollow Porous Carbon Spheres for Improved Lithium‐Sulfur Batteries

Abstract

AbstractRationally designing sulfur host which allows fast redox kinetics and can confine soluble polysulfides (PSs) is crucial for high‐performance lithium‐sulfur batteries (LSBs). Herein, N‐doped hollow porous carbon spheres (NHPCS) with large specific surface area (1526 m2 g−1) and strong interaction toward PSs were fabricated by a template method and applied as an efficient sulfur host. Benefiting from the hollow porous structure and function design, the NHPCS shows a high sulfur loading of 78.9 wt.% and improved adsorption capacity for PSs. Finally, the LSBs with the S@NHPCS as the cathode exhibit higher initial capacity of 1263 mAh g−1 at 0.2 C and lower decay rate (0.07 % per cycle) than S@CNT after 500 cycles at 1 C.