Extremely-Long-Lifespan and Ultrahigh-Rate Li-Ion Batteries Using Conjugated Porous Triazine Polymers

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Porous organic polymers (POPs) are promising electrode materials for rechargeable lithium-ion batteries (LIBs).
• Their porous structure, tunable redox properties, and conjugated systems offer advantages for electrochemical applications.
• However, designing POPs with enhanced stability and performance remains a key challenge.

Purpose of the Study:

• To design and develop a novel nitrogen-rich, two-dimensional triazine-containing microporous polymer (ACT) for LIBs.
• To investigate the electrochemical performance and lithium-ion storage mechanism of the ACT material.
• To explore ACT as a high-performance electrode material for next-generation LIBs.

Main Methods:

• Synthesis of a nitrogen-rich, 2D triazine-containing microporous polymer (ACT).
• Fabrication of ACT-based electrodes for half-cell LIB testing.
• Electrochemical characterization including rate performance and long-term cycling stability tests.
• Experimental and computational analysis of lithium-ion diffusion mechanisms.

Main Results:

• The ACT material exhibits a specialized porous and conjugated structure, enhancing electron transfer and stability.
• ACT-based LIBs demonstrate stable rate performance.
• A specific capacity of 247 mAh g^-1 was achieved after over 4000 cycles at 5 A g^-1.
• The lithium-ion diffusion mechanism within ACT was elucidated.

Conclusions:

• The designed ACT material shows excellent electrochemical performance and long cycling stability for LIBs.
• The porous and conjugated structure of ACT is crucial for its high performance.
• This work provides a viable strategy for developing advanced organic electrode materials for high-performance LIBs.