Journal
JOURNAL OF POWER SOURCES
Volume 256, Issue -, Pages 361-368Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.01.093
Keywords
Nitrogen-doped graphene; Carbon-sulfur composites; Sulfur cathode; Lithium-sulfur battery
Funding
- Teacher Research Fund of Central South University [2013JSJJ027]
- Fundamental Research Funds for the Central Universities of Central South University [2013zzts026]
- Strategic Emerging Industries Program of Shenzhen, China [JCYJ20120618164543322]
Ask authors/readers for more resources
Two types of nitrogen-doped graphene sheets (NGS) synthesized by a facile hydrothermal method are used to immobilize sulfur via an in situ sulfur deposition route. The structure and composition of the prepared nitrogen doped graphene/sulfur (NGS/S) composites are confirmed with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Scanning electron microscope (SEM) and Transmission electron microscope (TEM) images shows the porous sulfur particles are well wrapped by NGS. Compared with graphene/sulfur (GS/S) composite, the NGS-1/S composite with high loading (80 wt%) of sulfur presents a remarkably higher reversible capacity (1356.8 mAh g(-1) at 0.1 C) and long cycle stability (578.5 mAh g(-1) remaining at 1 C up to 500 cycles). Pyridinic-N rich NGS-1/S exhibits a better electrochemical performance than pyrrolic-N enriched NGS-2/S. The improvement of electrochemical properties could be attributed to the chemical interaction between the nitrogen functionalities on the surface of NGS and polysulfide as well as the enhanced electronic conductivity of the carbon matrix. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available