文献类型：期刊文献

英文题名：Trimming the π bridge of microporous frameworks for bidentate anchoring of polysulfides to stabilize lithium-sulfur batteries

作者：Xu, Jie[1];Tang, Weiqiang[1];Yu, Fengtao[2];Zhao, Shuangliang[1];Niu, Dongfang[1];Zhang, Xinsheng[1];Xin, Zhong[1];Chen, Renjie[3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Technol, Sch Chem Biol & Mat Sci, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China;[3]Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing, Peoples R China

年份：2020

卷号：8

期号：36

起止页码：19001

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20203909246184);WOS:【SCI-EXPANDED(收录号:WOS:000572173300041)】；

基金：J. X. and W. T. contributed equally to this work. This research was financially supported by the National Key Research and Development Program of China (No. 2017YFB0307500), the 111 Project of China (No. B08021) and Beijing Outstanding Young Scientists Program (BJJWZYJH01201910007023). We also thank the Research Center of Analysis and Test of East China University of Science and Technology for help with the characterization.

语种：英文

外文关键词：Binding energy - Electronic structure - Microporosity - Lithium compounds - Lithium sulfur batteries - Lithium batteries - Charge transfer

摘要：Microporous frameworks with pi-conjugated blocks and tunable electronic structures present enormous potential as energy-storage materials. However, the role of the pi-bridge and structure-activity relationship have not been explored in lithium-sulfur (Li-S) batteries. Here, we report a pi bridge trimming strategy for a semiconducting microporous framework (SMF) with tunable molecular polarity in redox-enhanced and dendrite-free Li-S batteries. The results demonstrate that the pi bridge of SMFs plays an important role in polysulfide anchoring and anion immobilization, including the binding energy, charge transfer, redox kinetics, and cyclability, which can be finely regulated by molecular engineering. As a result, SMF-2 with a thiophene bridge achieves bidentate anchoring of lithium polysulfides, which delivers an ultralow capacity-fading rate of 0.033% per cycle for 1000 cycles at 1C and stable Li plating/stripping performance for 300 h. Our work may shed light on the molecular design of pi-conjugated materials for advanced Li-S batteries.