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Free-standing, curled and partially reduced graphene oxide network as sulfur host for high-performance lithium-sulfur batteries |
Hui-Liang Chen(陈辉亮)1,2,3, Zhuo-Jian Xiao(肖卓建)1,2,3, Nan Zhang(张楠)1,2,3, Shi-Qi Xiao(肖仕奇)1,2,3, Xiao-Gang Xia(夏晓刚)1,2,3, Wei Xi(席薇)1,2,3, Yan-Chun Wang(王艳春)1,2, Wei-Ya Zhou(周维亚)1,2,3, Si-Shen Xie(解思深)1,2,3 |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Beijing Key Laboratory for Advanced Functional Materials and Structure Research, Beijing 100190, China;
3 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Lithium-sulfur (Li-S) batteries have received more and more attention because of higher specific capacity and energy density of sulfur than current lithium-ion batteries. However, the low electrical conductivity of sulfur and its discharge product, and also the high dissolution of polysulfides restrict the Li-S battery practical applications. To improve their performances, in this work, we fabricate a novel free-standing, curled and partially reduced graphene oxide (CPrGO for short) network and combine it with sulfur to form a CPrGO-S composite as a cathode for Li-S battery. With sulfur content of 60 wt%, the free-standing CPrGO-S composite network delievers an initial capacity of 988.9 mAh·g-1. After 200 cycles, it shows a stable capacity of 841.4 mAh·g-1 at 0.2 C, retaining about 85% of the initial value. The high electrochemical performance demonstrates that the CPrGO-S network has great potential applications in energy storage system. Such improved properties can be ascribed to the unique free-standing and continous CPrGO-S network which has high specific surface area and good electrical conductivity. In addition, oxygen-containing groups on the partially reduced graphene oxide are beneficial to preventing the polysulfides from dissolving into electrolyte and can mitigate the “shuttle effect”.
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Received: 03 April 2018
Revised: 27 April 2018
Accepted manuscript online:
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PACS:
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81.05.U-
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(Carbon/carbon-based materials)
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88.80.ff
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(Batteries)
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81.05.ue
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(Graphene)
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Fund: Project supported by the National Basic Research Program of China (Grant No.2012CB932302),the National Natural Science Foundation of China (Grant Nos.11634014,51172271,and 51372269),and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA09040202). |
Corresponding Authors:
Wei-Ya Zhou, Si-Shen Xie
E-mail: wyzhou@iphy.ac.cn;ssxie@iphy.ac.cn
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Cite this article:
Hui-Liang Chen(陈辉亮), Zhuo-Jian Xiao(肖卓建), Nan Zhang(张楠), Shi-Qi Xiao(肖仕奇), Xiao-Gang Xia(夏晓刚), Wei Xi(席薇), Yan-Chun Wang(王艳春), Wei-Ya Zhou(周维亚), Si-Shen Xie(解思深) Free-standing, curled and partially reduced graphene oxide network as sulfur host for high-performance lithium-sulfur batteries 2018 Chin. Phys. B 27 068101
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