A pre-synthetic strategy to construct single ion conductive covalent organic frameworks

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Chemistry

Background:

• Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
• Developing solid-state electrolytes with high ionic conductivity is crucial for next-generation batteries.
• Single-ion conductors offer advantages over traditional electrolytes by reducing side reactions and improving safety.

Purpose of the Study:

• To establish a pre-synthetic strategy for constructing single ion conductive covalent organic frameworks (COFs).
• To investigate the ionic conductivity of COFs incorporating alkali metal cations.
• To demonstrate the versatility of the method for different cations.

Main Methods:

• A pre-synthetic approach was employed to build COF structures.
• Alkali metal salts (Li+, Na+, K+) were used as monomers or dopants during COF synthesis.
• Ionic conductivity measurements were performed using electrochemical techniques.

Main Results:

• A high lithium-ion (Li+) conductivity of 1.6 × 10-3 S cm-1 was achieved at 273 K.
• Single sodium-ion (Na+) and potassium-ion (K+) conductive COFs were successfully synthesized.
• The pre-synthetic strategy proved effective for creating cation-specific conductive COFs.

Conclusions:

• The developed pre-synthetic strategy enables the construction of highly conductive single ion conductive COFs.
• This method provides a viable route for designing advanced solid-state electrolytes for ion batteries.
• The synthesis of cation-specific COFs opens possibilities for tailored ion transport materials.