Jiang Cheng, Tang Mi, Zhu Shaolong, Zhang Jidong, Wu Yanchao, Chen Yuan, Xia Cong, Wang Chengliang, Hu Wenping
School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, 430074, China.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Angew Chem Int Ed Engl. 2018 Dec 3;57(49):16072-16076. doi: 10.1002/anie.201809907. Epub 2018 Nov 8.
The shuttle effect of electrode materials always leads to capacity loss and poor cycle life of batteries. Two-dimensional (2D) covalent organic frameworks (COFs) with uniform and controllable nanopores provide a promising strategy for fabricating ionic sieves to inhibit the shuttle effect. However, the insoluble nature of COFs made it difficult to fabricate compact and ordered membranes of COFs. Herein, we report a novel method for facilely anisotropic ordering of 2D COFs via depositing COFs onto graphene. The resulted double-layer membranes acting as ionic sieves impressively inhibit the shuttle effect and exhibit versatility to both organic sodium-ion batteries and Li-S batteries, leading to high cyclability.
电极材料的穿梭效应总是导致电池容量损失和循环寿命不佳。具有均匀且可控纳米孔的二维（2D）共价有机框架（COF）为制造离子筛以抑制穿梭效应提供了一种有前景的策略。然而，COF的不溶性使得制备致密且有序的COF膜变得困难。在此，我们报道了一种通过将COF沉积在石墨烯上来轻松实现二维COF各向异性有序排列的新方法。所得的双层膜作为离子筛，令人印象深刻地抑制了穿梭效应，并且对有机钠离子电池和锂硫电池均具有通用性，从而实现了高循环稳定性。
