Bipolar fluorinated covalent triazine framework cathode with high lithium storage and long cycling capability

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Organic materials are promising for lithium-ion battery (LIB) cathodes but suffer from instability and poor conductivity.
• Covalent-organic frameworks (COFs) offer stable structures and tunable properties, making them attractive for energy storage.

Purpose of the Study:

• To synthesize a fluorinated covalent triazine framework (FCTF) for enhanced lithium-ion battery cathode performance.
• To investigate the impact of fluorine incorporation on the electrochemical properties of covalent triazine frameworks.

Main Methods:

• A simple ion-thermal method was employed for the synthesis of FCTF.
• Electrochemical performance was evaluated using FCTF as a cathode material in LIBs.

Main Results:

• FCTF demonstrated improved lithium storage performance compared to fluorine-free CTFs.
• A reversible capacity of 125.6 mA h g^-1 was retained after 200 cycles at 100 mA g^-1.
• Capacity of 106.3 mA h g^-1 was maintained after 400 cycles at 200 mA g^-1 with minimal capacity fade.

Conclusions:

• Fluorine incorporation significantly enhances the electrochemical stability and lithium storage capacity of covalent triazine frameworks.
• FCTF presents a viable and high-performance cathode material for next-generation lithium-ion batteries.