Enhancing lithium–sulphur battery performance by strongly binding the discharge products on amino-functionalized reduced graphene oxide

Zhiyu Wang, Yanfeng Dong, Hongjiang Li, Zongbin Zhao, Hao Bin Wu, Ce Hao, Shaohong Liu, Jieshan Qiu () and Xiong Wen (David) Lou ()
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Zhiyu Wang: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Yanfeng Dong: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Hongjiang Li: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Zongbin Zhao: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Hao Bin Wu: School of Chemical and Biomedical Engineering, Nanyang Technological University
Ce Hao: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Shaohong Liu: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Jieshan Qiu: Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology
Xiong Wen (David) Lou: School of Chemical and Biomedical Engineering, Nanyang Technological University

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Lithium–sulphur batteries are one very appealing power source with high energy density. But their practical use is still hindered by several issues including short lifespan, low efficiency and safety concern from the lithium anode. Polysulphide dissolution and insulating nature of sulphur are generally considered responsible for the capacity degradation. However, the detachment of discharge products, that is, highly polar lithium sulphides, from nonpolar carbon matrix (for example, graphene) has been rarely studied as one critical factor. Here we report the strongly covalent stabilization of sulphur and its discharge products on amino-functionalized reduced graphene oxide that enables stable capacity retention of 80% for 350 cycles with high capacities and excellent high-rate response up to 4 C. The present study demonstrates a feasible and effective strategy to solve the long-term cycling difficulty for lithium–sulphur batteries and also helps to understand the capacity decay mechanism involved.

Date: 2014
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DOI: 10.1038/ncomms6002

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