Enhanced chemical trapping and catalytic conversion of polysulfides by diatomite/MXene hybrid interlayer for stable Li-S batteries

作     者：Zehui Fan Chen Zhang Wuxing Hua Huan Li Yan Jiao Jingyi Xia Chuan-Nan Geng Rongwei Meng Yingxin Liu Quanjun Tang Ziyang Lu Tongxin Shang Guowei Ling Quan-Hong Yang Zehui Fan;Chen Zhang;Wuxing Hua;Huan Li;Yan Jiao;Jingyi Xia;Chuan-Nan Geng;Rongwei Meng;Yingxin Liu;Quanjun Tang;Ziyang Lu;Tongxin Shang;Guowei Ling;Quan-Hong Yang

作者机构：School of Marine Science and TechnologyTianjin UniversityTianjin 300072China Nanoyang GroupState Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China School of Chemical Engineering and Advanced MaterialsThe University of AdelaideAdelaideSA 5005Australia Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin UniversityBinhai New CityFuzhou 350207FujianChina 

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

年 卷 期：2021年第30卷第11期

页      面：590-598,I0014页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors appreciate support from the National Key Research and Development Program of China(No.2018YFE0124500) the Young Elite Scientists Sponsorship Program by Tianjin(TJSQNTJ-2020-11) the National Natural Science Foundation of China(Nos.51932005,U1710109) 

主　　题：Li-S battery MXene Diatomite Polysulfides 

摘      要：Lithium-Sulfur (Li-S) batteries with high theoretical energy density are promising energy storage systems in the next decades, while the lithium polysulfides (LiPSs) shuttling caused by the sluggish sulfur redox reaction severely lowers the practical performance. The use of interlayer between the cathode and separator has been widely investigated to physically or chemically block the LiPSs, while the introduction of catalytic materials is a more effective strategy to accelerate the conversion of LiPSs. MXene with rich surface chemistry has shown its potential for facilitating the catalytic conversion, however, the aggregation of MXene sheets usually leads to the loss of the catalytic active sites. Herein, we report a diatomite/MXene (DE/MX) hybrid material as the bifunctional interlayer for improving the adsorption/conversion of LiPSs in Li-S batteries. The diatomite with porous structure and rich silica-hydroxyl functional groups could trap LiPSs effectively, while prevent the aggregation of MXene. The DE/MX based interlayer showed bifunctions of enhancing the chemical adsorption and promoting the conversion of LiPSs. The Li-S batteries with the DE/MX interlayer delivered an improved cycling stability with a low capacity decay of 0.059% per cycle over 1000 cycles at 1.0 C. Moreover, stable 200 cycles can be realized with a high sulfur loading electrode up to 6.0 mg cm^(−2). This work provides an effective strategy to construct bifunctional interlayers for hindering the shuttling of LiPSs and boosting the practical application of Li-S batteries.