文献类型：期刊文献

英文题名：A Conductive Binder Based on Mesoscopic Interpenetration with Polysulfides Capturing Skeleton and Redox Intermediates Network for Lithium Sulfur Batteries

作者：Wang, Wenqiang[1];Hua, Lan[1];Zhang, Yifan[1];Wang, Gengchao[1];Li, Chunzhong[2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：63

期号：38

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20243316881034);WOS:【SCI-EXPANDED(收录号:WOS:001290350100001)】；

基金：We greatly appreciate the financial supports of National Natural Science Foundation of China (22109045, 21875065) and the China Postdoctoral Science Foundation Special Fund (2022T150211).

语种：英文

外文关键词：Lithium sulfur battery; emulsion binder; mesoscopic phase separation; conducting polymer; shuttle effect

摘要：The practical application of lithium-sulfur batteries with high theoretical energy density and readily available cathode active materials is hampered by problems such as sulfur insulation, dramatic volume changes, and polysulfide shuttling. The targeted development of novel binders is the most industrialized solution to the problem of sulfur cathodes. Herein, an aqueous conductive emulsion binder with the sulfonate-containing hard elastic copolymer core and the conjugate polymer shell, which is capable of forming a bicontinuous mesoscopic interpenetrating polymer network, is synthesized and investigated. Not only can the elastic skeleton formed by the copolymer bind the active substance under drastic volume changes, but also the rich ester and cyanide groups in it can effectively capture lithium polysulfide. Meanwhile, the conducting skeleton consisting of poly(3,4-ethylenedioxythiophene) both provides the additional charge conduction pathways and acts as the redox intermediates, significantly accelerating the kinetic process of lithium polysulfide conversion. Based on the synergistic effect of the above mechanisms, the use of the prepared binder on the sulfur carbon cathode significantly improves the rate performance and cycle stability of lithium sulfur batteries. An aqueous conductive emulsion binder with the sulfonate-containing hard elastic copolymer core and the conjugate polymer shell capable of forming a bicontinuous mesoscopic interpenetrating network was synthesized. The lithium sulfur battery assembled with this binder has excellent electrochemical performance, especially rate performance and cycling stability. image