Journal
ADVANCED SCIENCE
Volume 5, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/advs.201800621
Keywords
lithium-sulfur batteries; double shelled nanospheres; carbon spheres; N,S-codoping
Categories
Funding
- Natural Science Foundation of Jiangsu Province of China [BK20170963]
- National Natural Science Foundation of China [51702154, 21573109]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- AcRF [RG103/16, MOE2015-T2-1-148, MOE2011-T3-1-005]
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Lithium-sulfur batteries are regarded as very promising energy storage devices due to their high energy density, low cost, and environmental friendliness; however, their insulating properties and the instability of sulfur-based electrodes impede the practical applications of Li-S batteries. Here, a versatile strategy to synthesize double-shelled nitrogen and phosphorus codoped carbon spheres (NPDSCS) as an efficient sulfur host for Li-S batteries is reported. With strong trapping, good affinity, high adsorption for polysulfides, and the bifunctional catalyzing for sulfur redox processes, the developed NPDSCS cathodes with a high S loading of 72.4% exhibit large specific discharge capacity of 1326 mAh g(-1) at 0.1C, high Coulombic efficiency, good rate capability, and excellent cycling performance with a reversible capacity of 814 mAh g(-1) at 1C after 500 cycles.
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