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Acta Phys. Chim. Sin.  2014, Vol. 30 Issue (8): 1474-1480    DOI: 10.3866/PKU.WHXB201406041
ELECTROCHEMISTRY AND NEW ENERGY     
One-Step Hydrothermal Preparation and Electrochemical Performance of Graphene/Sulfur Cathode Composites
LI Qing-Zhou, LI Yu-Hui, LI Ya-Juan, LIU You-Nian
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
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Abstract  

Reduced graphene oxide/sulfur (RGO/S) composites were synthesized by a one-step hydrothermal method using a mixture of sodium thiosulfate (Na2S2O3) and graphene oxide (GO) solution reacting under acid conditions. We explored the influence of the hydrothermal temperature, reaction time, and sulfur content on the composites. Analysis by X-ray diffraction (XRD), scanning electron microscope (SEM), and the galvanostatic charge and discharge shows that the composites have excellent cycling performance when synthesis occurs at 180 ℃ for 12 h to provide a carbon:sulfur mass ratio of 3:7. The first discharge capacity is delivered at 931 mAh·g-1 and it remains at 828.16 mAh·g-1 after 50 cycles. The coulomb efficiency of the composites is above 95%. In addition, the rate capability of these composites is much better than that of sulfur. Sulfur molecules can be evenly distributed between the graphene layers and fixed to the functional groups on the surface of graphene by this one-step hydrothermal method.



Key wordsLithium-sulfur battery      Graphene      Hydrothermal method      Sodium thiosulfate     
Received: 21 March 2014      Published: 04 June 2014
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (51104184).

Corresponding Authors: LI Ya-Juan     E-mail: yajuanli@csu.edu.cn
Cite this article:

LI Qing-Zhou, LI Yu-Hui, LI Ya-Juan, LIU You-Nian. One-Step Hydrothermal Preparation and Electrochemical Performance of Graphene/Sulfur Cathode Composites. Acta Phys. Chim. Sin., 2014, 30(8): 1474-1480.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201406041     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2014/V30/I8/1474

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