文献类型：期刊文献

英文题名：Emulsion Binders with Multiple Crosslinked Structures for High-Performance Lithium-Sulfur Batteries

作者：Tan, Ya-Fang[1];Wang, Wen-Qiang[1];Gao, Ling[1];Guan, Ai-Guo[1];Wang, Geng-Chao[1]

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

年份：2023

卷号：41

期号：7

起止页码：1027

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20230613552386);WOS:【SCI-EXPANDED(收录号:WOS:000926091300003)】；

基金：AcknowledgmentsThis work was financially supported by the National Natural Science Foundation of China (Nos. 21875065 and 22109045) and China Postdoctoral Science Foundation (No. 2021-M701191).

语种：英文

外文关键词：Acrylate copolymer; Internal and external crosslinking; Emulsion binders; Lithium-sulfur batteries

摘要：Lithium-sulfur batteries suffer a lot from the huge volume change and the shuttle effect. However, conventional poly(vinylidene fluoride) binder has intrinsic drawbacks, such as low ion conductivity, weak polysulfide-trapping ability, poor mechanical properties, and requirement of organic solvents. Herein, we designed a functional emulsion binder with multi crosslinked structure. Such a structure was formed by the covalent crosslinking within and between the emulsion particles, which facilitates the adapting of the volume expansion of sulfur cathode, thereby ensuring the integrity of electrodes. Besides, the polar functional groups endow the binder with strong chemisorption of lithium polysulfide and fast lithium-ion migration ability. Thus, the assembled lithium-sulfur battery displayed a high initial discharge capacity of 1246 mAh center dot g(-1) at 0.1 C, and a capacity fading rate of 0.04% per cycle after 500 cycles at 0.5 C. Even at a high sulfur mass loading of 4.8 mg center dot cm(-2), a high capacity of 956 mAh center dot g(-1) was still obtained at 0.2 C.