Microwave assisted preparation of expanded graphite/sulfur composites as cathodes for Li-S batteries

ZHU Fu-liang; YANG Zhi; ZHAO Jin-ping; ZHAO Xin

doi:10.1016/S1872-5805(16)60011-2

Volume 31 Issue 2

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Article Navigation > New Carbon Mater. > 2016 > 31(2): 199-204

ZHU Fu-liang, YANG Zhi, ZHAO Jin-ping, ZHAO Xin. Microwave assisted preparation of expanded graphite/sulfur composites as cathodes for Li-S batteries. New Carbon Mater., 2016, 31(2): 199-204. doi: 10.1016/S1872-5805(16)60011-2

Citation:

ZHU Fu-liang, YANG Zhi, ZHAO Jin-ping, ZHAO Xin. Microwave assisted preparation of expanded graphite/sulfur composites as cathodes for Li-S batteries. New Carbon Mater., 2016, 31(2): 199-204. doi: 10.1016/S1872-5805(16)60011-2

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Microwave assisted preparation of expanded graphite/sulfur composites as cathodes for Li-S batteries

doi: 10.1016/S1872-5805(16)60011-2

1.
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2.
Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, China

Funds: National Natural Science Foundation of China(21303234, 51364024); China Postdoctoral Science Foundation(2013M530437).

Received Date: 2016-01-31
Accepted Date: 2016-04-21
Rev Recd Date: 2016-04-02
Publish Date: 2016-04-28

Abstract

Abstract

Expanded graphite/sulfur(EG/S) composites were prepared by microwave irradiation of mixtures of sulfur and expanded graphite with S/EG ratios from 4:1 to 12:1. Sulfur was sublimed and entered the EG pores when the mixtures were heated and was condensed to form particles within the pores during cooling. The pores of the EG acted as microcontainers to host the sulfur, and the material, with its interconnected and conductive pore walls, acted as a current collector for the cathode of the Li-S battery. The size of sulfur particles in the EG pores could be controlled by the S/EG mass ratio. When the ratio is 10:1, relatively uniform size sulfur particles could be obtained. Both the S/EG ratio and the sulfur particle size have an important effect on the capacity increase of the Li-S battery. Using a composite with a S/EG ratio of 10:1 as the cathode gives the highest capacity of 1020 mAhg^-1 at a rate of 0.1 C.
- Expanded graphite,
- Lithium-sulfur batteries,
- Microwave,
- Sulfur particles size

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