Beijing Key Laboratory of Green Chemical Reaction, Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, PR China.
Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081, PR China.
Angew Chem Int Ed Engl. 2017 Dec 18;56(51):16223-16227. doi: 10.1002/anie.201710025. Epub 2017 Nov 20.
Supramolecular materials, in which small organic molecules are assembled into regular structures by non-covalent interactions, attract tremendous interests because of their highly tunable functional groups and porous structure. Supramolecular adsorbents are expected to fully expose their abundant adsorptive sites in a dynamic framework. In this contribution, we introduced cucurbit[6]uril as a supramolecular capsule for reversible storage/delivery of mobile polysulfides in lithium-sulfur (Li-S) batteries to control undesirable polysulfide shuttle. The Li-S battery equipped with the supramolecular capsules retains a high Coulombic efficiency and shows a large increase in capacity from 300 to 900 mAh g at a sulfur loading of 4.2 mg cm . The implementation of supramolecular capsules offers insights into intricate multi-electron-conversion reactions and manifests as an effective and efficient strategy to enhance Li-S batteries and analogous applications that involve complex transport phenomena and intermediate manipulation.
超分子材料中，小分子通过非共价相互作用组装成规则结构，由于其功能基团高度可调且具有多孔结构，因此引起了极大的兴趣。超分子吸附剂有望在动态框架中充分暴露其丰富的吸附位点。在本研究中，我们引入葫芦[6]脲作为超分子胶囊，用于可逆存储/输送锂硫（Li-S）电池中的可移动多硫化物，以控制不希望发生的多硫化物穿梭现象。 装有超分子胶囊的 Li-S 电池保持了较高的库仑效率，并在硫负载量为 4.2mg·cm-2 时，容量从 300mAh·g-1 大幅增加到 900mAh·g-1。 超分子胶囊的应用为复杂的多电子转化反应提供了深入的了解，并表现出一种有效且高效的策略，可用于增强 Li-S 电池和类似的应用，这些应用涉及复杂的传输现象和中间操作。
