Integrated Conjugated Microporous Polymers/Carbon Nanotube Composite Boosting Superior Anodic Lithium Storage Behavior

Abstract

AbstractConjugated microporous polymers (CMPs) with redox‐active sites have attracted extensive notice in rechargeable lithium‐ion batteries (LIBs) due to their extended π‐conjugated structure, uniform porosity, and low solubility. However, poor electrical conductivity and low utilization of active sites limit their application in large‐scale energy storage systems (ESS). Herein, we synthesized two carbonyl‐rich imine‐based CMPs by the polycondensation reaction between tetromino‐benzoquinone and aldehydes, and integrated them with carbon nanotubes (TB‐CMP@CNT and TBP‐CMP@CNT). The composites display good electrochemical performances as anode‐active materials of LIBs, which benefits from abundant redox‐active units, stable π‐conjugated framework, and fast Li+ diffusion kinetics. Especially, TBP‐CMP@CNT has a high reversible capacity of 954.6 mAh g−1 at 50 mA g−1, a long cycle stability at 1 A g−1 with no decrease in capacity after 1000 cycles, and superior rate performance of 221.5 mAh g−1 at 2 A g−1.