文献类型：期刊文献

英文题名：Polymers with intrinsic microporosity engineered via acid-base pairs for highly selective lithium-ion transport channels

作者：Ying, Jiadi[1,2,3];Cui, Zhen[4];Tu, Lei[1];Liu, Tiancun[1];Lu, Song[1];Shen, Qi[1];Guo, Min[1];Wang, Yeqing[1];Yang, Zhen[4];Zeng, Minfeng[4,5];Yu, Zhixin[1];Cao, Xingzhong[6];Lin, Yuqing[2,7]

机构：[1]Shaoxing Univ, Inst New Energy, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Comprehens Utilizat Salt Lake, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[3]Shaoxing Univ, Zhejiang Key Lab Funct Ion Membrane Mat & Technol, Shaoxing 312000, Peoples R China;[4]Shaoxing Univ, Res Ctr Adv Catalyt Mat & Funct Mol Synth, Sch Chem & Chem Engn, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[5]Shaoxing Inst Technol, Shaoxing 312000, Peoples R China;[6]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China;[7]Kobe Univ, Res Ctr Membrane & Film Technol, Dept Chem Sci & Engn, Kobe 6578501, Japan

年份：2026

卷号：741

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20255119743077);WOS:【SCI-EXPANDED(收录号:WOS:001643240400001)】；

基金：This work was supported by National Natural Science Foundation of China (Grant No. 12575316, 12175149) and the Central Government Guiding Local Science and Technology Development Funds (2025ZY01029) . The authors extend their gratitude to Ms. Wang Mei-fang (from Scientific Compass www.shiyanjia.com ) for providing invaluable assistance with the FTIR analysis.

语种：英文

外文关键词：Electrodialysis; Cation exchange membrane; Ionic cross-linking; Polymer of intrinsic microporosity; Lithium extraction

摘要：The development of high-performance cation exchange membranes (CEMs) with precise ion selectivity is crucial for electrodialysis applications, such as lithium extraction from salt-lake brines. However, conventional membrane materials often face a trade-off between high ion permeability and selectivity. In this work, we engineered a novel ionic cross-linked microporous membrane by blending sulfonated poly(ether ether ketone) (SPEEK) with a quaternized polymer of intrinsic microporosity (QPIM). This strategy leverages acid-base pair interactions between the sulfonic acid groups of SPEEK and the quaternary ammonium groups of QPIM to create well-defined sub-nanometer-scale ion transport channels. The optimized QPIM/SPEEK membrane (QPIM15) exhibits an exceptional Li+/Mg2+ selectivity of 6.98 and a high Li + permeation flux of 1.9 mol m-2 h-1, outperforming the pristine SPEEK and commercial CSO membranes. Comprehensive characterization and molecular dynamics simulations demonstrate that the enhanced performance originates from the synergy between size-sieving effects of narrowed microporous channels and electrostatic repulsion of cationic quaternary ammonium groups. This work provides a facile and effective approach for designing advanced ion-selective membranes, demonstrating great potential for efficient lithium-ion separation and other electrodialysis processes.