文献类型：期刊文献

英文题名：Poly(ionic liquid)-Based Quasi-Solid-State Copolymer Electrolytes for Dynamic-Reversible Adsorption of Lithium Polysulfides in Lithium-Sulfur Batteries

作者：Cai, Xiaomin[1];Cui, Bowen[1];Ye, Bei[1];Wang, Wenqiang[1];Ding, Jianlong[1];Wang, Gengchao[1]

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

年份：2019

卷号：11

期号：41

起止页码：38136

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20194207529063);WOS:【SCI-EXPANDED(收录号:WOS:000491219700081)】；

基金：We greatly appreciate the financial supports of the National Natural Science Foundation of China (21875065, 51673064) and International Science & Technology Cooperation Program of China (2016YFE0131200).

语种：英文

外文关键词：lithium-sulfur batteries; graphene/carbon nanotube film; self-supporting cathode; ionic liquid; quasi-solid-state electrolyte

摘要：The shuttle of the long-chain lithium polysulfides (LiPSs) is the main obstacle to the practical application of lithium-sulfur batteries. Herein, a poly(butyl acrylate/1-ethyl-3-vinylimidazole bis[(trifluoromethyl)sulfonyl]imide)-based quasi-solid-state copolymer electrolyte poly(ethylene glycol) diacrylate (PEGDA-P(BA-co-[EVIm]TFSI) QPE-IL) was prepared for lithium-sulfur batteries. The butyl acrylate component with abundant ester groups ensures the strong chemical capture for LiPSs. What is more, the introduction of ionic liquid ([EVIm]TFSI) can greatly improve the ionic conductivity and lithium-ion migration rate. More importantly, the dynamic-reversible adsorption of LiPSs was realized by chemical adsorption of ester-rich groups and electrostatic repulsion of free-moving negatively charged ions. As a result, the lithium-sulfur battery assembled by a reduced graphene oxide/carbon nanotube film@sulfur (rGOCTF@S) self-supporting cathode and QPE-IL displayed a high initial discharge capacity of 1179 mA h g(-1), good cycling stability (72% capacity retention after 200 cycles at 0.5 C), and superior rate performance.