期刊
NANO ENERGY
卷 11, 期 -, 页码 746-755出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2014.11.062
关键词
Flexible electrodes; Lithium-sulfur batteries; Carbon nanotubes; Graphene
类别
资金
- Natural Scientific Foundation of China [21306103, 21276141, 21273109, 21422604]
- Research Fund for the Doctoral Program of Higher Education of China [20120002120047]
The rational design and fabrication of flexible electrodes with high capacity, high rate capability, and high cycling stability is of urgent need for bendable, wearable, and implantable electronic devices. The integration of conductive nanocarbon as flexible scaffolds is an efficient and effective route toward flexible high-energy-density lithium-sulfur batteries. Herein, a freestanding paper electrode was constructed by rational integration of high conductive super-long carbon nanotubes (CNTs) and nano-sized hollow graphene spheres (GSs) through a room-temperature solution-processable method for lithium-sulfur batteries. The hollow GSs afforded close space to accommodate sulfur species, sustain the volume fluctuation during cycling, and retard the dissolution of polysulfides and parasitic shuttle. The graphene walls of GSs and super-long CNTs synergistically constructed hierarchical short-/long-range electron/ion pathways. Consequently, the as-obtained flexible paper electrode was with a high sulfur utilization of 81% (corresponding to 1346 mA h g(-1)) at a current density of 0.17 A g(-1) (0.19 mA cm(-2)), a high-rate capacity retention of 40% when the current density increased to supreme 16.7A g(-1) (18.4 mA cm(-2)), and a superior capacity retention of 89.0% over 500 cycles. This proof-of-concept research indicated the well hybridization of graphene and CNTs holds promise in the efficient use as flexible electrodes for future flexible electronics. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据