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Related Experiment Video

Updated: Feb 16, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

Cationic Covalent Organic Framework Nanosheets for Fast Li-Ion Conduction.

Hongwei Chen¹, Hangyu Tu¹, Chenji Hu²

¹College of Materials Science and Engineering, Huaqiao University , Xiamen 361021, People's Republic of China.

Journal of the American Chemical Society

|January 6, 2018

Summary

Covalent organic frameworks (COFs) with incorporated cationic skeletons enhance lithium-ion conductivity by splitting ion pairs. This breakthrough offers a promising pathway for advanced solid-state electrolytes in batteries.

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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Published on: June 9, 2023

Area of Science:

Materials Science
Electrochemistry
Solid-state ionics

Background:

Covalent organic frameworks (COFs) are explored as solid-state electrolytes for lithium-ion batteries due to their porous structure.
Infiltrated lithium salts in COFs often form ion pairs, hindering efficient lithium-ion (Li+) conduction.
Developing strategies to dissociate these ion pairs is crucial for improving ionic conductivity.

Purpose of the Study:

To enhance the ionic conductivity of COFs for solid-state lithium-ion conductor applications.
To address the limitation of slow ionic diffusion caused by Li+ salt ion pairing within COF pores.
To investigate the effect of incorporating a cationic skeleton into COFs for improved Li+ transport.

Main Methods:

Design and synthesis of COFs featuring an integrated cationic skeleton.
Incorporation of Li+ salts into the modified COF structure.
Electrochemical characterization to measure Li+ conductivity.
Analysis of ion pair dissociation and dielectric screening effects.

Main Results:

The cationic skeleton effectively screens Li+ salt ion pairs, increasing free Li+ ion concentration.
Achieved a significantly improved Li+ conductivity of up to 2.09 × 10^-4 S cm^-1 at 70 °C.
Demonstrated high ionic conductivity in the absence of any liquid solvent.

Conclusions:

Incorporating cationic skeletons into COFs is an effective strategy to enhance Li+ conductivity in solid-state electrolytes.
The developed COF material shows potential for use in advanced solid-state lithium-ion batteries.
This approach overcomes the limitations of ion pairing in traditional COF-based electrolytes.