Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 41, Issue 3, Pages 1819-1827Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.09.062
Keywords
Graphene/sulfur/SiO2; Ternary composites; Lithium-sulfur batteries; High cycling stability
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Funding
- Scientific Research Foundation for the Returned Scholars, postdoctoral preferential support of P.R China [2015M581910]
- Zhejiang province [BSH1502029]
- National Science Foundation of China [51501175]
- Guangxi Key Laboratory of Information Materials (Guilin University of Electronic Technology) [1210908-02-K]
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Ternary graphene/sulfur/SiO2 (graphene/S/SiO2) composite has been successfully synthesized by compositing sulfur with graphene and then wrapping with SiO2. The graphene/S/SiO2 composite exhibits superior specific capacity and improved cycling stability owing to the combined contributions from both graphene and SiO2 when used as cathode materials for lithium/sulfur batteries. The graphene/S/SiO2 demonstrates a specific capacity of 696 mAh g(-1) after activated, which is considerably higher than the graphene/S and pure sulfur samples. In addition, the graphene/S/SiO2 and graphene/S composites demonstrate improved cycling stability and much higher coulombic efficiency than the pure sulfur sample owing to the successful prevention of polysulfides diffusion. Furthermore, both graphene/S/SiO2 and graphene/S composites show an activation step in first 30 cycles, which can be attributed to the gradually increased capacity from reduction of high-order polysulfides to low-order polysulfides. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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