氧化还原
共轭体系
部分
共价键
亚胺
化学
锂(药物)
单独一对
阳极
共价有机骨架
组合化学
化学工程
光化学
电极
无机化学
有机化学
聚合物
分子
物理化学
催化作用
医学
工程类
内分泌学
作者
Xiang Li,Wei Liu,Yan Wang,Linze Lv,Feng Hong,Weibo Huang,Ying Sun,Weixing Xiong,Honghe Zheng
标识
DOI:10.1016/j.cej.2023.145310
摘要
Covalent organic frameworks (COFs) have been widely used in various fields due to their abundant elemental resources, easy structure control, and abundant tunable porous structures. COFs containing electroactive organic groups with reversible redox behavior are potential electrode materials for next-generation high-performance lithium-ion batteries (LIBs). However, the aromatic conjugated structure of the backbone moiety in most reported COFs cannot participate in redox reactions, resulting in low capacity of COFs. At the same time, the synthesis processes of COFs are usually complicated and generally requires high temperature and high pressure. On this basis, an imine bond-rich COF (TAACOF) with reversible Li-ion bonding is developed, which has the advantages of facile preparation and low energy consumption. In particular, the lone pair electrons of the N atom in the imine bond can induce lithium ions to combine with the aromatic conjugated structure, which greatly improves the capacity of the TAACOF electrode. After 800 cycles, the active sites of the TAACOF are fully activated, and after a 14-electron redox reaction, the specific capacity can reach as high as 1035.7 mAh/g.
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