A functional hyperbranched binder enabling ultra-stable sulfur cathode for high-performance lithium-sulfur battery

作     者：Xiang Luo Xianbo Lu Xiaodong Chen Ya Chen Chunyang Yu Dawei Su Guoxiu Wang Lifeng Cui Xiang Luo;Xianbo Lu;Xiaodong Chen;Ya Chen;Chunyang Yu;Dawei Su;Guoxiu Wang;Lifeng Cui

作者机构：School of Materials Science and EngineeringDongguan University of TechnologyDongguan 523808GuangdongChina Center for Clean Energy TechnologySchool of Mathematical and Physical ScienceFaculty of ScienceUniversity of Technology SydneyNSW 2007Australia R&D CenterShanghai Kingfa Sci.&Tech.Co.Ltd.Shanghai 201714China Department of Applied ChemistrySchool of ScienceXi'an Jiaotong UniversityXi'an 710049ShaanxiChina School of Physical Science and TechnologyShanghaiTech UniversityShanghai 201210China School of Chemistry&Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China 

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

年 卷 期：2020年第29卷第11期

页      面：63-72页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

基　　金：the Startup Research Fund of Dongguan University of Technology(KCYKYQD2017015) Leading Talents of Innovation and Entrepreneurship of the Dongguan City D2017(16) the Australian Research Council(ARC)through the ARC Discovery project(DP160104340) 

主　　题：Functional binder Hyperbranched polymer Sulfur cathode Polysulfide adsorption Lithium-sulfur battery 

摘      要：Binders are of vital importance in stabilizing the cathodes to enhance the cycling stability of lithiumsulfur(Li-S) batteries. However, conventional binders are typically confronted with the drawback of inability for adsorbing lithium polysulfide(Li PS), thus resulting in severe active material losing and rapid capacity fading. Herein, a novel water-soluble hyperbranched poly(amidoamine)(HPAA) binder with controllable hyperbranched molecular structure and abundant amino end groups for Li-S battery is designed and fabricated, which can improve efficient adsorption for Li PS and stability of the sulfur cathodes. Besides, the strong intermolecular hydrogen bonds in HPAA binder can contribute to the structural stability of S cathode and integration of the conductive paths. Therefore, the Li-S battery with this functional binder exhibits excellent cycle performance with a capacity retention of 91% after 200 cycles at 0.1 *** at a high sulfur loading of 5.3 mg cm-2, a specific capacity of 601 mA h g-1 can also be *** functional theory(DFT) calculation further demonstrates that the enhanced electrochemical stability derives from the high binding energy between amino groups and LiP S and the wide electrochemical window(6.87 e V) of HPAA molecule. Based on the above all, this functional polymer will lighten a new species of binders for eco-friendly sulfur cathodes and significantly promote the practical applications of high-performance Li-S batteries.