Challenges and perspectives of covalent organic frameworks for advanced alkali-metal ion batteries  

作　　者：Jingyi Xu Yifan Xu Chenling Lai Tingting Xia Beining Zhang Xiaosi Zhou 

机构地区：[1]Jiangsu Key Laboratory of New Power Batteries,Jiangsu Collaborative Innovation Center of Biomedical Functional Materials,School of Chemistry and Materials Science,Nanjing Normal University,Nanjing,210023,China

出　　处：《Science China Chemistry》2021年第8期1267-1282,共16页中国科学（化学英文版）

基　　金：This work was financially supported by the Natural Science Foundation of Jiangsu Province of China(BK20180086).

摘　　要：Covalent organic frameworks(COFs)are a class of porous crystalline polymers that have been widely investigated in various fields,including energy storage,photo/electrocatalysis,drug delivery.The covalent-bond interconnection allows COFs extraordinary chemical and thermal stability,and the porous structure ensures a high ion-diffusion coefficient.These merits compensate for the drawbacks of organic electrodes that are easy to dissolve and have low charge conductivity,and promote the development of novel electrode materials with excellent performance,environmental friendliness,and low price.However,the application of COFs also encountered many problems,such as poor electronic conductivity due to the large band gap.Moreover,in some three-dimensional(3D)COFs and stacked two-dimensional(2D)COFs,the huge crystal structure,aligned ultralong channels,and numerous crystal defects usually impede ion transport,and the large molecular weights of COFs generally decrease the specific capacities.These issues are urgently needed to be solved.Here in this review,we summarize the latest progress,core challenges and coping strategies concerning with the use of COFs in alkali-metal ion batteries,discuss the impact of material structure on energy storage,and propose strategies for the construction of high-performance COF-based electrodes.

关 键 词：covalent organic frameworks alkali-metal ion batteries CATHODE ANODE structural design 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ317[化学工程—高聚物工业]