Fully Conjugated Covalent Triazine Framework Integrating Hexaazatrinaphthylene Unit as Anode Material for...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Hybrid lithium-ion capacitors (HLICs) offer high energy and power density but suffer from kinetic imbalances.
• Covalent organic frameworks (COFs) show promise as electrode materials due to their tunable structures.

Purpose of the Study:

• To design and synthesize a novel pseudocapacitive anode material for HLICs.
• To address the kinetic imbalance issue in HLICs by developing a suitable anode.

Main Methods:

• Construction of a fully conjugated covalent triazine framework (PT-CTF) incorporating hexaazatrinaphthylene units.
• Fabrication of PT-CTF||AC HLICs using the synthesized material as the anode.
• Electrochemical performance testing, including energy density, power density, and cycling stability.

Main Results:

• The PT-CTF material provides abundant active sites (C═N, C═C) and improved electron transport.
• The fabricated PT-CTF||AC HLICs achieved a high energy density of 164.9 Wh kg^-1.
• Excellent power density (13.1 kW kg^-1) and cycling capability (72% after 10,000 cycles) were demonstrated.

Conclusions:

• The developed PT-CTF is a promising pseudocapacitive anode material for high-performance HLICs.
• The study demonstrates a viable strategy to overcome kinetic limitations in HLICs.
• This work contributes to the advancement of next-generation energy storage devices.