Functionalized Graphene Quantum Dots Modified Dioxin-Linked Covalent Organic Frameworks for Superior Lithium Storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Covalent organic frameworks (COFs) are emerging porous materials with tunable properties.
• COFs show promise as electrodes for rechargeable lithium-ion batteries (LIBs).
• Improving the capacity and cycle stability of COF-based electrodes is crucial for practical applications.

Purpose of the Study:

• To develop a modified COF material for enhanced LIB performance.
• To investigate the effect of graphene quantum dots (GQDs) on COF properties for lithium storage.
• To evaluate the COF-GQDs composite as an anode material for LIBs.

Main Methods:

• Synthesized a novel graphene quantum dots (GQDs) modified covalent organic framework (COF-GQDs) material.
• Fabricated and tested the COF-GQDs composite as an anode for lithium-ion batteries (LIBs).
• Characterized the electrochemical performance, including cycling stability and rate capability.

Main Results:

• The COF-GQDs electrode delivered a high reversible capacity of ~820 mAh g⁻¹ after 300 cycles at 100 mA g⁻¹.
• Enhanced rate performance and a shortened activation process were observed.
• The modification with GQDs improved lithium-ion transport kinetics and electrode stability.

Conclusions:

• Graphene quantum dots modification significantly enhances the lithium storage performance of COFs.
• The COF-GQDs composite is a promising anode material for high-performance LIBs.
• This work paves the way for designing advanced COF-based materials for next-generation energy storage.