Covalent organic framework containing dual redox centers as an efficient anode in Li‐ion batteries

Covalent organic frameworks (COFs) with periodic channels and tunable chemical structures have been widely considered as promising electrode materials in rechargeable batteries. However, the design and construction of high‐performance COFs‐based electrodes still face some challenges in the introduct...

Full description

Saved in:
Bibliographic Details
Published in:SmartMat (Beijing, China) China), 2022-12, Vol.3 (4), p.685-694
Main Authors: Tong, Yifan, Sun, Zhaopeng, Wang, Jiawen, Huang, Weiwei, Zhang, Qichun
Format: Article
Language:English
Subjects:
anodes
covalent organic frameworks
Decomposition
dual active sites
Electrochemical analysis
Electrode materials
Electrodes
Energy storage
Lithium
Lithium-ion batteries
Molecular structure
molecular structure design
Polymers
Rechargeable batteries
Scanning electron microscopy
Spectrum analysis
Structural stability
Thermogravimetric analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Covalent organic frameworks (COFs) with periodic channels and tunable chemical structures have been widely considered as promising electrode materials in rechargeable batteries. However, the design and construction of high‐performance COFs‐based electrodes still face some challenges in the introduction of multiple efficient redox centers as well as the reduction of dead mass. To address these issues, a unique COF containing double active centers (C═N and N═N) is developed as an anode in rechargeable lithium‐ion batteries (LIBs). The as‐prepared COF displays excellent electrochemical performance due to its remarkable structural stability and the existence of many active groups. Meanwhile, its electrochemical performance is significantly better than that of the small molecule compound or the linear polymer with the same construction units. Even at a high current density of 5 A/g, the LIBs with COF electrodes remain at a high discharge capacity of 227 mAh/g after 2000 cycles. Moreover, the distinction in electrochemical performances of these three materials is further revealed by calculation. This study illustrates the importance of molecular structure design for improving the performance of organic electrodes. The article discusses the relationship between structure and electrochemical performance by regulating the degree of polymerization and first proposes Li+ storage mechanism of double active sites based on C═N and N═N groups in covalent organic frameworks.
ISSN:2688-819X
2688-819X
DOI:10.1002/smm2.1115