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Potassium-Ion Conduction in Covalent Organic Frameworks.

Shanshan Tao¹, Ruoyang Liu¹, Xinyu Mu¹

¹Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.

Journal of the American Chemical Society

|January 27, 2026

Summary

This summary is machine-generated.

Covalent organic frameworks with polyelectrolyte interfaces enable efficient potassium-ion conduction. This breakthrough offers a new pathway for developing advanced solid-state potassium-ion batteries and devices.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Covalent organic frameworks (COFs) offer tunable porous structures for mass transport.
Potassium-ion conduction is crucial for energy storage but poorly understood in artificial pores.
Developing efficient potassium-ion conductors is key for next-generation batteries.

Purpose of the Study:

To design and investigate COFs with polyelectrolyte interfaces for enhanced potassium-ion conduction.
To elucidate the structural parameters governing potassium-ion transport in these materials.
To explore the potential of these frameworks in solid-state potassium-ion batteries.

Main Methods:

Systematic engineering of COF pore walls with varying oligo(ethylene oxide) chain densities.
Creation of covalently linked polyelectrolyte interfaces within the COF channels.
Analysis of potassium-ion transport mechanisms and conductivity using electrochemical techniques.

Main Results:

Polyelectrolyte interfaces facilitate potassium-ion transport through well-defined channels.
A nonlinear, exponential increase in conductivity was observed with increasing interface density.
Low-energy-barrier ion hopping via an electrolyte network was identified as the transport mechanism.
Exceptional conductivities were achieved, surpassing simple additive models.

Conclusions:

Polyelectrolyte interfaces are essential for high-performance potassium-ion conduction in COFs.
The density and arrangement of polyelectrolyte chains significantly impact ion transport.
This work provides fundamental insights for designing advanced potassium-ion conductors for solid-state batteries.