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

As promising electrode materials, porous organic polymers (POPs) have been extensively investigated for rechargeable lithium-ion batteries (LIBs) owing to their significant surface area, tunable redox nature, open channels, and π-conjugated system. Herein, a nitrogen-rich two-dimensional triazine-containing microporous polymer (ACT) is designed and developed as an electrode material of a half-cell for rechargeable lithium-ion storage. The specialized porous and conjugated structure improves the effectiveness of electron transformation and physicochemical stability. Since it has a higher molecular weight, it performs well over exceptionally long cycling performance. According to the results, ACT-based LIBs display stable rate performance and may deliver a specific capacity of 247 mAh g^-1 after more than 4000 cycles at 5 A g^-1. Additionally, extensive experimental investigation and calculations are used to examine the lithium-ion diffusion mechanism of double active sites in the ACT. This work offers a possible strategy to design excellent organic materials of electrochemical performance for next-generation high-performance LIBs.