Bi-structural fibers of carbon nanotube coated with nitrogen/oxygen dual-doped porous carbon layer as superior sulfur host for lithium-sulfur batteries
Bi-structural fibers of carbon nanotube coated with nitrogen/oxygen dual-doped porous carbon layer as superior sulfur host for lithium-sulfur batteries
复制标题
涂有氮/氧双掺杂多孔碳层的碳纳米管双结构纤维作为锂硫电池的优质硫主体
DOI：
10.1016/j.jallcom.2019.04.192
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发表时间：
2019-08-15
影响因子：
6.2
通讯作者：
Pan, Hongge
中科院分区：
文献类型：
--
作者：
Nie, Bo;Zhou, Chuancang;Pan, Hongge
锂硫电池是最有前途的二次储能系统之一。然而，它们的快速容量衰减和低反应动力学仍然是一个挑战。本研究采用自组装方法合成了以碳纳米管为芯层、氮/氧双掺杂多孔碳为包覆层的独特的双结构多孔碳杂化纤维。一维（1D）杂化材料具有大的比表面积、高的孔隙率、丰富的氮/氧双掺杂和高的电导率，是理想的锂硫电池阴极硫主体材料。这种新颖的结构碳主体使硫阴极具有显著的循环稳定性和上级倍率性能。当硫负载量为75wt%时，硫阴极的初始容量为1110 mAh·g（-1），在0.2C下循环200次后，容量保持率为684 mAh·g（-1）。本工作提供了一种新型结构的一维多孔碳基质及其制备方法，用于高效硫阴极。(C)2019年爱思唯尔出版
Lithium-sulfur batteries are one of the most promising secondary energy storage systems. However, their fast capacity fading and low reaction kinetics still remain a challenge. In the present study, a unique bistructural porous carbon hybrid of fibers with carbon nanotube as core and nitrogen/ oxygen dual-doped porous carbon as coating layer is synthesized by a self-assembly approach. The one-dimensional (1D) hybrid has large surface area, high porosity, rich nitrogen/ oxygen dual-doping and high conductivity, which is admirable as sulfur host for lithium-sulfur battery cathodes. This novel structural carbon host enables the sulfur cathode a significant cyclic stability and superior rate capability. With a sulfur loading as high as 75 wt%, the sulfur cathode achieves an initial capacity of 1110mAh g(-1) and a capacity of 684mAh g(-1) retains after 200 cycles at 0.2 C. This work offers a new structural 1D porous carbon host and its fabrication method for high efficiency sulfur cathodes. (C) 2019 Published by Elsevier B.V.