Journal
SMALL
Volume 18, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202106640
Keywords
atomic catalysts; carbon-encapsulation; cathodes; kinetics; Li-S batteries
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Funding
- National Natural Science Foundation of China [51771076, NSFC51621001]
- Guangdong Pearl River Talents Plan [2017GC010218]
- R&D Program in Key Areas of Guangdong Province [2020B0101030005]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515120049]
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This study introduces atomic cobalt dopants into nitrogen-doped hollow carbon spheres, effectively restricting the shuttle effect and promoting the kinetics of sulfur redox reactions, thus designing high-performance Li-S batteries.
Lithium-sulfur (Li-S) batteries have been considered as one of the most promising electrochemical energy storage systems because of their high energy density. However, a series of issues severely limit the practical performances of Li-S batteries such as low conductivity, significant volume change, and shuttle effect. The hollow carbon spheres with huge voids and high electrical conductivity are promising as sulfur hosts. Unfortunately, the nonpolar nature of carbon materials cannot prevent the shuttle effect effectively. In this case, the atomic cobalt is introduced to a nitrogen-doped hollow carbon sphere (ACo@HCS) through polymerization and controlled pyrolysis. The atomic cobalt dopants not only act as active sites to restrict the shuttle effect, but also can promote the kinetics of the sulfur redox reactions. ACo@HCS acting as sulfur host exhibits a high discharge capacity (1003 mAh g(-1)) at a 1.0 C rate after 500 cycles, and the corresponding decay rate is as low as 0.002% per cycle. This exciting work paves a new way to design high-performance Li-S batteries.
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