3D Honeycomb-Shaped Co Porous Carbon Interlayer for Inhibiting the Shuttle Effect of Lithium-Sulfur Batteries

In this paper, we develop a simple annealing method to prepare three-dimensional (3D) honeycomb porous carbon (Co-PC) as an interlayer material. Co2+ was introduced by redox reaction to improve the initial coulombic efficiency and boost the specific capacity of the electrodes; CoS obtained during the S melt-diffusion process served as redox catalyst. The 3D interconnected porous structure of the Co-PC interlayer was found to effectively adsorb polysulfide to inhibit the shuttle effect. Remarkable cycling stability was obtained, and a high reversible capacity of 803 mAh/g with a negligible fading rate of 0.024% per cycle at 1C was obtained after 200 cycles.