Journal
ACS NANO
Volume 8, Issue 9, Pages 9295-9303Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn503220h
Keywords
highly ordered meso-microporous carbon; core-shell structure; Li-S batteries; electrochemical performance; smaller sulfur molecules
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Funding
- Natural Science Foundation of China [21273087, 21271078, 51002057]
- PCSIRT (Program for Changjiang Scholars and Innovative Research Team in University)
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For lithium-sulfur 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 shell carbon (MM(S) as a sulfur container, which combines the advantages of both mesoporous and microporous carbon. With large pore volume and highly ordered porous structure, the core promises a sufficient sulfur loading and a high utilization of the active material, while the shell 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(-1) 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 shell structured carbon can also be applicable for designing some other electrode materials for energy storage.
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