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Co4N Nanosheet Assembled Mesoporous Sphere as a Matrix for Ultrahigh Sulfur Content Lithium–Sulfur Batteries
- Source :
- ACS Nano. 11:6031-6039
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- High utilization and loading of sulfur in cathodes holds the key in the realization of Li–S batteries. We here synthesized a Co4N mesoporous sphere, which was made up of nanosheets, via an easy and convenient method. This material presents high affinity, speedy trapping, and absorbing capacity for polysulfides and acts as a bifunctional catalysis for sulfur redox processes; therefore it is an ideal matrix for S active material. With such a mesoporous sphere used as a sulfur host in Li–S batteries, extraordinary electrochemistry performance has been achieved. With a sulfur content of 72.3 wt % in the composite, the Co4N@S delivered a high specific discharge capacity of 1659 mAh g–1 at 0.1 C, almost reaching its theoretic capacity. Also, the battery exhibited a large reversible capacity of about 1100 mAh g–1 at 0.5 C and 1000 mAh g–1 at 1 C after 100 cycles. At a high rate of 2 C and 5 C, after 300 cycles, the discharge capacity finally stabilized at 805 and 585 mAh g–1. Even at a 94.88% sulfur content, the...
- Subjects :
- Battery (electricity)
Materials science
Inorganic chemistry
General Engineering
General Physics and Astronomy
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Sulfur
0104 chemical sciences
Catalysis
chemistry.chemical_compound
Adsorption
chemistry
General Materials Science
0210 nano-technology
Bifunctional
Mesoporous material
Nanosheet
Subjects
Details
- ISSN :
- 1936086X and 19360851
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- ACS Nano
- Accession number :
- edsair.doi...........c8973876c346f58402fc7765769189ce