Journal
JOURNAL OF POWER SOURCES
Volume 450, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227658
Keywords
Heteroatom doping; Carbon bowls; Lithium-sulfur batteries; Confinement of polysulfides; Long cycle life
Funding
- National Natural Science Foundation of China [51772156, 51872144]
- Natural Science Foundation of Jiangsu Province [BK20180019, BK20171423]
- Fundamental Research Funds for the Central Universities [30917015102, 30918014103]
- Advanced Research Project of The Professional Leader of Teachers in Jiangsu Higher Vocational Colleges [2019GRFX008]
- PAPD of Jiangsu
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Lithium-sulfur batteries are particularly attractive due to their high theoretical energy density. Unfortunately, the commercial application of lithium-sulfur batteries is now impeded by the shuttle effect of soluble polysulfides. Herein, we demonstrate that the polysulfides can be effectively confined to the phosphorous/oxygen co-doped mesoporous carbon bowls (P/O-MCB) via the strong electrostatic dipole-dipole interaction. Different from other doping methods, the P2O5 can not only be used as the phosphorous and oxygen sources for co-doping, but also generate enormous pressure difference on the surface of hollow mesoporous carbon sphere under the action of surface tension, leading to the formation of porous bowl-like morphology. Benefiting from the P/O co-doping, high surface area, and unique bowl-like morphology, the S@P/O-MCB electrode delivers an initial capacity of 897 mAh g(-1) at 1C and retains a reversible capacity of 489 mAh g(-1) after 800 cycles. More importantly, the S@P/O-MCB electrode shows an outstanding areal capacity of 5.5 mAh cm(-2) at a high sulfur loading of 5.02 mg cm(-2).
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