Confining sulfur in intact freestanding scaffold of yolk-shell nanofibers with high sulfur content for lithium-sulfur batteries

作     者：Xilai Zhang Peng Zhang Shijie Zhang Yongshang Zhang Ruohan Hou Kangli Liu Fujun Miao Guosheng Shao Xilai Zhang;Peng Zhang;Shijie Zhang;Yongshang Zhang;Ruohan Hou;Kangli Liu;Fujun Miao;Guosheng Shao

作者机构：School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001HenanChina State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM)Zhengzhou UniversityZhengzhou 450001HenanChina Zhengzhou Materials Genome InstituteXingyang 40100HenanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第12期

页      面：378-387页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 51972287, 51502269) Natural Science Foundation of Henan Province (No. 182300410187) Outstanding Young Talent Research Fund of Zhengzhou University (No. 1521320023) 

主　　题：TiO2 TiN Electrospinning Lithium-sulfur batteries Carbon nanofibers Yolk-shell structure 

摘      要：Nanostructure design holds great potential in fabricating sulfur electrodes that host a high sulfur loading and still attain high electrochemical utilization for the developing of high-energy-density lithium-sulfur(Li-S) batteries. In this contribution, we introduce the yolk-shell structure into a freestanding carbon nanofibers film and construct a complete hollow yolk-shell Ti O2/carbon nanofibers@void@TiN@carbon(TiO2-CNFs@void@Ti N@C) composite. With inherent double conductive network and strong adsorption capability for polysulfides, the Ti O2-CNFs@void@Ti N@C composite can not only provide sufficient electrical contact for the insulating sulfur, but also effectively entrap polysulfides for prolonged cycle life. As a result, an excellent capacity retention ratio of 60.9% after 1000 cycles at 1 C as well as a high capacity of688.5 mA h g^(-1) at 5 C rate is accomplished with the cells employing Ti O2-CNFs@void@TiN @C as a cathode substrate for sulfur. Moreover, the TiO2-CNFs@void@Ti N@C composite, with a high S mass loading of9.5 mg cm^(-2), delivers a superb areal capacity of 8.2 mAh cm^(-2).