Gao Guang-Kuo, Wang Yi-Rong, Wang Si-Bo, Yang Ru-Xin, Chen Yifa, Zhang Yu, Jiang Cheng, Wei Mei-Jie, Ma Huiyuan, Lan Ya-Qian
School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China.
Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
Angew Chem Int Ed Engl. 2021 Apr 26;60(18):10147-10154. doi: 10.1002/anie.202016608. Epub 2021 Mar 18.
Multidimensional fabrication of metal-organic frameworks (MOFs) into multilevel channel integrated devices are in high demanded for Li-S separators. Such separators have advantages in pore-engineering that might fulfill requirements such as intercepting the diffusing polysulfides and improving the Li /electrolyte transfer in Li-S batteries. However, most reported works focus on the roles of MOFs as ionic sieves for polysulfides while offering limited investigation on the tuning of Li transfer across the separators. A photoinduced heat-assisted processing strategy is proposed to fabricate MOFs into multidimensional devices (e.g., hollow/Janus fibers, double-or triple-layer membranes). For the first time, a triple-layer separator with stepped-channels has been designed and demonstrated as a powerful separator with outstanding specific capacity (1365.0 mAh g ) and cycling performance (0.03 % fading per cycle from 100 to 700 cycle), which is superior to single/double-layer and commercial separators. The findings may expedite the development of MOF-based membranes and extend the scope of MOFs in energy-storage technologies.
将金属有机框架（MOF）多维制造到多级通道集成器件中，对于锂硫电池隔膜有着很高的需求。这类隔膜在孔隙工程方面具有优势，可能满足诸如拦截扩散的多硫化物以及改善锂硫电池中锂/电解质传输等要求。然而，大多数已报道的工作聚焦于MOF作为多硫化物离子筛的作用，而对隔膜中锂传输调控的研究有限。本文提出一种光致热辅助加工策略，用于将MOF制造成多维器件（如中空/双面纤维、双层或三层膜）。首次设计并展示了一种具有阶梯通道的三层隔膜，它是一种强大的隔膜，具有出色的比容量（1365.0 mAh g）和循环性能（从100到700次循环，每次循环衰减0.03%），优于单层/双层隔膜和商业隔膜。这些发现可能会加速基于MOF的隔膜的发展，并扩展MOF在储能技术中的应用范围。
