Stable Flavone-Linked Covalent Organic Frameworks for High-Performance Lithium-ion Battery Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Organic Chemistry

Background:

• Developing sustainable anode materials is crucial for organic lithium-ion batteries (LIBs).
• Existing materials often face challenges with stability and efficiency.

Purpose of the Study:

• To design and synthesize a stable and efficient anode material for LIBs.
• To explore the potential of flavone-linked covalent organic frameworks (FV-COFs) for energy storage applications.

Main Methods:

• Synthesized a highly crystalline FV-COF using a cascade reaction based on Claisen-Schmidt condensation.
• Incorporated an oxygen-rich flavonoid structure and a fully conjugated framework.
• Evaluated the electrochemical performance of FV-COF as an anode material in LIBs.

Main Results:

• FV-COF exhibited exceptional physicochemical stability and reversible redox capacity.
• Achieved a high steady-state capacity of 1136.8 mAh g^-1 after ten cycles at 0.1 A g^-1.
• Demonstrated excellent rate capability and cyclic stability, retaining 546.5 mAh g^-1 at 5.0 A g^-1 after 10,000 cycles with >98% Coulombic efficiency.

Conclusions:

• FV-COFs are promising candidates for high-performance, lightweight battery anodes.
• The study highlights the potential of redox-rich COFs with stable linkages for advanced energy storage.
• This research contributes to the development of environmentally sustainable battery technologies.