文献类型：期刊文献

英文题名：Duplex trapping and charge transfer with polysulfides by a diketopyrrolopyrrole-based organic framework for high-performance lithium-sulfur batteries

作者：Xu, Jie[1];Bi, Shiming[2];Tang, Weiqiang[1];Kang, Qi[3];Niu, Dongfang[1];Hu, Shuozhen[1];Zhao, Shuangliang[1];Wang, Limin[2];Xin, Zhong[1];Zhang, Xinsheng[1]

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 Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Shanghai Jiao Tong Univ, Shanghai Key Lab Elect Insulat & Thermal Ageing, Dept Polymer Sci & Engn, Shanghai 200240, Peoples R China

年份：2019

卷号：7

期号：30

起止页码：18100

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20193207273492);WOS:【SCI-EXPANDED(收录号:WOS:000477988200038)】；

基金：This research was financially supported by the National Key Research and Development Program of China (No. 2017YFB0307500), and Shanghai Pujiang Program (No. 18PJ14020000). W. T. is grateful to the China Scholarship Council and British Council for the visiting fellowship.

语种：英文

外文关键词：Charge transfer - Energy storage - Lithium batteries - Design for testability - Electrolytes - Polysulfides - Binding energy - Lithium compounds

摘要：Lithium-sulfur (Li-S) batteries are widely regarded as some of the most promising next-generation energy storage systems due to their cost advantage and high theoretical energy density. However, the shuttle effect arising from the dissolution of polysulfides into organic electrolyte, the insulating nature of sulfur and their discharge products severely restrict the development of high-energy density Li-S batteries. Herein, a porous organic framework containing diketopyrrolopyrrole (DPP) building blocks is reasonably designed and it serves as a shuttle-inhibiting layer to bifunctionally increase the physical and chemical trapping of lithium polysulfides. The frameworks were synthesized through a bottom-up approach, allowing precise control of the network design at the molecular level. As a result, the framework-derived microscale networks with polar units effectively hinder the shuttle effect of polysulfides and promise excellent electrochemical performances with regard to improving kinetics and long-term cycling stability of Li-S batteries. DFT calculations demonstrate the charge transfer (CT) behavior and favorable binding energy between the DPP units and lithium polysulfides. This work not only provides a novel strategy to fabricate a bifunctional modified separator for high-performance Li-S batteries, but also inspires us to further develop advanced materials for emerging energy storage applications.