钴
分离器(采油)
材料科学
化学工程
多孔性
纳米纤维
膜
兴奋剂
氮气
碳纳米纤维
碳纤维
超级电容器
无机化学
纳米技术
化学
电容
电极
复合材料
有机化学
碳纳米管
复合数
冶金
物理
工程类
物理化学
热力学
光电子学
生物化学
作者
Guoping Chen,Xiong Song,Haihui Wang,Ying Wang,Tuo Gao,Liang-Xin Ding
标识
DOI:10.1016/j.memsci.2017.11.026
摘要
Abstract Lithium–sulfur (Li–S) battery is considered as one of the most promising advanced energy storage devices. However, several critical issues remain which restrict their practical applications, especially the shuttle effect of soluble lithium polysulfides. Herein, we designed a lightweight multifunctional layer comprising reduced graphene oxide (rGO) and cobalt/nitrogen co-doped carbon nanofibers (Co-N-C) to modified the polypropylene (PP) separator to facilitate the electrochemical performance of Li–S batteries. The Co-N-C/rGO layer with abundant mesopores possesses strong immobilization ability of polysulfides and high electronic conductivity, which could work as an intrinsic physical/chemical frame work barrier and an upper current collector to trap and reutilize the polysulfides. Consequently, the Li–S battery with the modified Co-N-C/rGO/PP separator exhibits excellent cycling performance and good rate capability. A high discharge capacity of 1344 mAh g–1 at 0.1 C, 658 mAh g–1 at 5 C and a low capacity degradation rate of 28.8% after 500 cycles at 0.5 C were obtained. These exciting results indicate that this multifunctional Co-N-C/rGO/PP separator could be a promising separator candidate for Li–S batteries.
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