Ni Lubin, Gu Jie, Jiang Xinyuan, Xu Hongjie, Wu Zhen, Wu Yuchao, Liu Yi, Xie Ju, Wei Yongge, Diao Guowang
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, Jiangsu, P. R. China.
Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
Angew Chem Int Ed Engl. 2023 Sep 4;62(36):e202306528. doi: 10.1002/anie.202306528. Epub 2023 Jul 31.
Developing polyoxometalate-cyclodextrin cluster-organic supramolecular framework (POM-CD-COSF) still remains challenging due to an extremely difficult task in rationally interconnecting two dissimilar building blocks. Here we report an unprecedented POM-CD-COSF crystalline structure produced through the self-assembly process of a Krebs-type POM, [Zn (WO ) (SbW O ) ] , and two β-CD units. The as-prepared POM-CD-COSF-based battery separator can be applied as a lightweight barrier (approximately 0.3 mg cm ) to mitigate the polysulfide shuttle effect in lithium-sulfur batteries. The designed Li-S batteries equipped with the POM-CD-COSF modified separator exhibit remarkable electrochemical performance, attributed to fast Li diffusion through the supramolecular channel of β-CD, efficient polysulfide-capture ability by the dynamic host-guest interaction of β-CD, and improved sulfur redox kinetics by the bidirectional catalysis of POM cluster. This research provides a broad perspective for the development of multifunctional supramolecular POM frameworks and their applications in Li-S batteries.
由于合理连接两个不同的构建单元是一项极其困难的任务，因此开发多金属氧酸盐-环糊精簇-有机超分子框架（POM-CD-COSF）仍然具有挑战性。在此，我们报道了一种前所未有的POM-CD-COSF晶体结构，它是通过Krebs型多金属氧酸盐[Zn(WO)(SbWO)]与两个β-环糊精单元的自组装过程制备而成。所制备的基于POM-CD-COSF的电池隔膜可作为轻质屏障（约0.3 mg cm），以减轻锂硫电池中的多硫化物穿梭效应。配备有POM-CD-COSF改性隔膜的设计锂硫电池表现出卓越的电化学性能，这归因于锂通过β-环糊精的超分子通道快速扩散、β-环糊精的动态主客体相互作用具有高效的多硫化物捕获能力以及多金属氧酸盐簇的双向催化作用改善了硫氧化还原动力学。这项研究为多功能超分子POM框架的开发及其在锂硫电池中的应用提供了广阔的前景。
