Multilayer structure covalent organic frameworks (COFs) linking by double functional groups for advanced K⁺ batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Covalent organic frameworks (COFs) are promising anode materials for potassium ion batteries (PIBs) due to their structural properties.
• Developing stable and high-performance anode materials is crucial for advancing PIBs.

Purpose of the Study:

• To synthesize and characterize a novel multilayer COF with double functional groups (imine and amidogent).
• To evaluate the potassium storage performance of the synthesized d-COF as an anode material for PIBs.

Main Methods:

• Solvothermal synthesis of multilayer COF structures.
• Electrochemical testing of the d-COF as a PIB anode, including capacity and cycling stability measurements.

Main Results:

• The synthesized multilayer d-COF exhibits a high reversible capacity of 229.5 mAh g⁻¹ at 0.2 A g⁻¹.
• The d-COF demonstrates excellent cycling stability, retaining 106.1 mAh g⁻¹ at 5.0 A g⁻¹ after 2000 cycles.
• Performance surpasses that of individual COFs, highlighting the benefits of the double functionalization and multilayer structure.

Conclusions:

• The multilayer d-COF offers a promising new avenue for developing advanced anode materials for PIBs.
• The combined advantages of imine and amidogent groups in a multilayer structure enhance electrochemical performance.
• This work provides a new strategy for designing high-performance COF-based anode materials for next-generation batteries.