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Research Article

Sulfur nanoparticles encapsulated in reduced graphene oxide nanotubes for flexible lithium-sulfur batteries

Kena Chen1, Jun Cao1, Qiongqiong Lu1, Qingrong Wang1, Minjie Yao1, Mingming Han1, Zhiqiang Niu1( ), Jun Chen1,2
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)College of ChemistryNankai UniversityTianjin300071China
Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)Nankai UniversityTianjin300071China
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Abstract

Rapid development of flexible electronic devices is promoting the design of flexible energy-storage devices. Lithium-sulfur (Li-S) batteries are considered as promising candidates for high energy density energy-storage devices. Therefore, flexible Li-S batteries are desired. In this study, we fabricated composite films of freestanding reduced graphene oxide nanotubes wrapped sulfur nanoparticles (RGONTs@S) by pressing RGONTs@S composite foams, which were synthesized by combining cold quenching with freeze-drying and a subsequent reduction process. These RGONTs@S composite films can serve as self-supporting cathodes for Li-S batteries without additional binders and conductive agents. Their interconnected tubular structure allows easy electron transport throughout the network and helps to confine the polysulfides produced during the charge/discharge process. As a result, the RGONTs@S composite films exhibited a high initial specific capacity, remarkable cycling stability, and excellent rate capability. More importantly, the RGONTs@S composite films can serve as electrodes in flexible Li-S batteries. As a proof of concept, soft-packaged Li-S batteries were assembled using these electrodes and they displayed stable electrochemical performance at different bending states.

Keywords

lithium-sulfur batteriesgraphenenanotubesflexible

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Nano Research
Volume 11 Issue 3,
March 2018
Pages 1345-1357
DOI: 10.1007/s12274-017-1749-2
Cite this article:
Chen K, Cao J, Lu Q, et al. Sulfur nanoparticles encapsulated in reduced graphene oxide nanotubes for flexible lithium-sulfur batteries. Nano Research, 2018, 11(3): 1345-1357. https://doi.org/10.1007/s12274-017-1749-2

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Received: 14 May 2017
Revised: 15 June 2017
Accepted: 23 June 2017
Published: 02 February 2018
© Tsinghua University Press and Springer-Verlag GmbH Germany 2017
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