Construction of Electrocatalytic and Heat?Resistant Self?Supporting Electrodes for High?Performance Lithium–Sulfur Batteries

论文摘要

Boosting the utilization e ciency of sulfur electrodes and suppressing the "shuttle e ect" of intermediate polysulfides remain the critical challenge for high-performance lithium–sulfur batteries（LSBs）. However, most of reported sulfur electrodes are not competent to realize the fast conversion of polysulfides into insoluble lithium sulfides when applied with high sulfur loading, as well as to mitigate the more serious shuttle e ect of polysulfides, especially when worked at an elevated temperature. Herein, we reported a unique structural engineering strategy of crafting a unique hierarchical multifunctional electrode architecture constructed by rooting MOF-derived CoS2/carbon nanoleaf arrays（CoS2–CNA） into a nitrogen-rich 3D conductive sca old（CTNF@CoS2–CNA） for LSBs. An accelerated electrocatalytic e ect and improved polysulfide redox kinetics arising from CoS2–CNA were investigated. Besides, the strong capillarity e ect and chemisorption of CTNF@CoS2–CNA to polysulfides enable high loading and e cient utilization of sulfur, thus leading to high-performance LIBs performed not only at room temperature but also up to an elevated temperature（55 °C）. Even with the ultrahigh sulfur loading of 7.19 mg cm-2, the CTNF@CoS2–CNA/S cathode still exhibits high rate capacity at 55 °C.

论文目录

• HIGHLIGHTS
• 1 Introduction
• 2 Experimental Sections
•   2.1 Materials Preparation
•     2.1.1 Preparation of Flexible CTNF
•     2.1.2 Preparation of ZIF?67 Precursor and CTNF@ZIF?67 Hybrid
•     2.1.3 Preparation of Flexible CTNF@Co–CNA and CTNF@CoS2–CNA Composites
•     2.1.4 Preparation of CTNF@CoS2–CNA/S Cathode
•     2.1.5 Preparation of Li2S8 Solution and Adsorption Test
•     2.1.6 Preparation of Li2S6 and Symmetric Cell Assembly
•   2.2 Materials Characterization
•   2.3 Electrochemical Measurements
• 3 Results and Discussion
•   3.1 Fabrication,Structure,and Composition of the CTNF@CoS2–CNA Electrode
•   3.2 Electrochemical Properties at Room and Elevated Temperature
•   3.3 Catalytic Conversion and Trapping of Polysulfides on the CTNF@CoS2–CNA Electrode
• 4 Conclusion

文章来源

类型: 期刊论文

作者: Xuemei Zhang,Yunhong Wei,Boya Wang,Mei Wang,Yun Zhang,Qian Wang,Hao Wu

来源: Nano-Micro Letters 2019年04期

年度: 2019

分类: 工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 化学,电力工业

单位: College of Materials Science and Engineering, Sichuan University,Department of Advanced Energy Materials, Sichuan University

基金: financial support from the National Key Research and Development Program of China (2018YFB0104201)

分类号: TM912;O646.5

页码: 386-402

总页数: 17

文件大小: 3015K

下载量: 6