中国物理B ›› 2018, Vol. 27 ›› Issue (6): 68101-068101.doi: 10.1088/1674-1056/27/6/068101

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Free-standing, curled and partially reduced graphene oxide network as sulfur host for high-performance lithium-sulfur batteries

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)   

  1. 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
  • 收稿日期:2018-04-03 修回日期:2018-04-27 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: Wei-Ya Zhou, Si-Shen Xie E-mail:wyzhou@iphy.ac.cn;ssxie@iphy.ac.cn
  • 基金资助:

    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).

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. 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
  • Received:2018-04-03 Revised:2018-04-27 Online:2018-06-05 Published:2018-06-05
  • Contact: Wei-Ya Zhou, Si-Shen Xie E-mail:wyzhou@iphy.ac.cn;ssxie@iphy.ac.cn
  • Supported by:

    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).

摘要:

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”.

关键词: lithium-sulfur batteries, sulfur cathode, curled reduced graphene oxide

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”.

Key words: lithium-sulfur batteries, sulfur cathode, curled reduced graphene oxide

中图分类号:  (Carbon/carbon-based materials)

  • 81.05.U-
88.80.ff (Batteries) 81.05.ue (Graphene)