Journal
IONICS
Volume 21, Issue 7, Pages 1925-1930Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-015-1376-4
Keywords
Lithium/sulfur battery; Sulfur/nitrogen-doped graphene (S/N-G) composite; Cathode material; Simple sonicated mixing
Funding
- Ministry of Education and Science of Kazakhstan
- World Bank
- Government of Kazakhstan [Group 157]
- National Natural Science Foundation of China [21406052]
- Program for the Outstanding Young Talents of Hebei Province [BJ2014010]
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A sulfur/nitrogen-doped graphene (S/N-G) composite was synthesized by simple sonicated mixing of nanosized sulfur suspension and nitrogen-doped graphene suspension followed by heat treatment. Scanning electron microscopy and energy dispersive spectroscopy mapping showed the formation of a porous structure with uniform distribution of sulfur and nitrogen-doped graphene. Electrochemical performance reveals that the resultant S/N-G composite exhibits a high reversible capacity of 1355 mAh g(-1) at the initial cycle, with 823 mAh g(-1) remaining after 80 cycles at 0.1 C. Moreover, a reversible capacity of 475 mAh g(-1) could still be obtained at 2.5 C. Such an electrochemical performance of S/N-G composite is superior to the graphene counterpart. The enhanced electrochemical performance can be attributed to the introduction of nitrogen-doped graphene with the N functionalization, which provides both a more effective electron conduction path and a stronger physical and chemical confinement setting for elemental sulfur and resident polysulfides.
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