Imidazole-Linked Fully Conjugated Covalent Organic Framework for High-Performance Sodium-Ion Battery  

作　　者：Lu Liu Yu Gong Yifan Tong Hao Tian Xubo Wang Yiming Hu Shaofeng Huang Weiwei Huang Sandeep Sharma Jingnan Cui Yinghua Jin Weitao Gong Wei Zhang 

机构地区：[1]State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024 [2]Department of Chemistry,University of Colorado Boulder,Boulder,Colorado 80309 [3]Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 066004

出　　处：《CCS Chemistry》2024年第5期1255-1263,共9页中国化学会会刊（英文）

基　　金：the Natural Science Foundation of Liaoning province(grant no.2019-MS-046);W.Zhang thanks the University of Colorado Boulder for financial support of this work;W.Huang acknowledges the support from the National Natural Science Foundation of China(grant no.21875206);The authors acknowledge the assistance of the Dalian University of Technology Instrumental Analysis Center.

摘　　要：Covalent organic frameworks(COFs)have garnered increasing attention as promising electrode materials for sodium-ion batteries(SIBs)due to their ordered backbones,uniform pore sizes,and high surface areas.However,they also face challenges,including low capacity,unsatisfactory rate performance,and limited cycling stability,which pose the primary obstacles to their practical use.Herein,a pyrenoimidazole-based COF,denoted as PyIm-COF,has been synthesized as a novel electrode material for highperformance SIBs using an efficient synthetic strategy.With extended fully conjugated backbones and readily accessible redox-active sites,PyIm-COF demonstrates remarkable high-rate performance,delivering around 250 m Ah g^(−1)and excellent cycling stability,retaining 97.2%of its capacity even after 2500 cycles at 5 A g^(−1),which is higher than that of most previously reported COF-based SIBs.This work provides valuable insights into the development of nitrogen-rich conjugated COF electrode materials for rechargeable SIBs.

关 键 词：pyrenoimidazole fully conjugated backbones covalent organic framework electrode material sodium-ion battery 

分 类 号：TM912[电气工程—电力电子与电力传动]