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Nanomaterials 2018, 8(5), 303; https://doi.org/10.3390/nano8050303

Novel Sulfur/Ethylenediamine-Functionalized Reduced Graphene Oxide Composite as Cathode Material for High-performance Lithium-Sulfur Batteries

1
School of Materials Science and Engineering, Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin 300130, China
2
Synergy Innovation Institute of GDUT, Heyuan 517000, China
3
Shenyang Institute of Automation in Guangzhou, Chinese Academy of Sciences, Guangzhou 511458, China
*
Authors to whom correspondence should be addressed.
Received: 31 March 2018 / Revised: 1 May 2018 / Accepted: 1 May 2018 / Published: 6 May 2018
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Abstract

Sulfur/ethylenediamine-functionalized reduced graphene oxide (S/EDA-RGO) nanocomposites were synthesized using a simple process. Ethylenediamine (EDA) was employed as both the reducing agent and the modification component. The morphologies, microstructures, and compositions of S/EDA-RGO composites were characterized by various detection techniques. The data indicated that EDA-RGO used as scaffolds for sulfur cathodes could enhance the electronic conductivity of the composites and strengthen the adsorbability of polysulfides. Meanwhile, the electrochemical properties of both S/EDA-RGO and S/RGO composites that were used as cathodes for lithium-sulfur (Li-S) batteries were investigated. The initial discharge capacity of S/EDA-RGO composites reached 1240 mAh g−1, with reversible capacity being maintained at 714 mAh g−1 after 100 cycles. The improvement in cycling stability of S/EDA-RGO composites was further verified at different current rates. These findings demonstrated that proper surface modification of RGO by EDA reducing agent might improve the electrochemical performances of Li–S batteries. View Full-Text
Keywords: ethylenediamine; reduced graphene oxides; lithium-sulfur batteries ethylenediamine; reduced graphene oxides; lithium-sulfur batteries
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Chen, Z.; Sun, Z.; Zhang, Y.; Tan, T.; Tian, Y.; Chen, Z. Novel Sulfur/Ethylenediamine-Functionalized Reduced Graphene Oxide Composite as Cathode Material for High-performance Lithium-Sulfur Batteries. Nanomaterials 2018, 8, 303.

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