文摘
For lithium鈥搒ulfur batteries, commercial application is hindered by the insulating nature of sulfur and the dissolution of the reaction intermediates of polysulfides. Here, we present an ordered meso-microporous core鈥搒hell carbon (MMCS) as a sulfur container, which combines the advantages of both mesoporous and microporous carbon. With large pore volume and highly ordered porous structure, the 鈥渃ore鈥?promises a sufficient sulfur loading and a high utilization of the active material, while the 鈥渟hell鈥?containing microporous carbon and smaller sulfur acts as a physical barrier and stabilizes the cycle capability of the entire S/C composite. Such a S/MMCS composite exhibits a capacity as high as 837 mAh g鈥? at 0.5 C after 200 cycles with a capacity retention of 80% vs the second cycle (a decay of only 0.1% per cycle), demonstrating that the diffusion of the polysulfides into the bulk electrolyte can be greatly reduced. We believe that the tailored highly ordered meso-microporous core鈥搒hell structured carbon can also be applicable for designing some other electrode materials for energy storage.
Keywords:
highly ordered meso-microporous carbon; core鈭抯hell structure; Li鈭扴 batteries; electrochemical performance; smaller sulfur molecules