Carbon Nanotubes Coupled Bipolar Covalent Organic Frameworks With Nitrogen‐Enriched Redox‐Active Sites for High‐Performance Lithium‐Organic Batteries

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: May 12, 2025

Abstract Covalent organic frameworks (COFs) are frequently explored as attractive electrode materials for next‐generation sustainable lithium‐ion batteries. Unfortunately, such metal‐free suffer from low practical capacities and poor rate capabilities, due to intrinsic conductivity, limited redox‐active sites, insufficient electrochemical utilization. Herein, integrating conductive carbon nanotubes (CNTs) with bipolar‐type COFs enriched by multi‐electron sites is rationally crafted in situ Schiff base condensation fabricate robust core–shell hierarchical heterostructures (CNT@COF). Remarkably, the as‐fabricated CNT@COF cathode delivers a large reversible capacity (253.1 mAh g −1 at 0.2 A ), high capability (161.6 mA h 5 excellent cycling stability (retaining 76.6% of initial over 1000 cycles), because fast ion/electron transport utilization active groups. Accordingly, both spectroscopy techniques theoretical calculations employed reveal redox reaction mechanisms COF moieties conversion nitrogen‐containing centers (imine, triazine, triphenylamine) against PF 6 − /Li + rationalized clearly. This work crafts an unusual strategy address common issues polymer electrodes macromolecular engineering unlock barrier high‐capacity high‐rate storage powerful

Language: Английский

Cu-mediated bipolar-type extended π-conjugated microporous polymers for lithium-ion battery cathode with high energy density and fast-charging capability

Chemical Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A Cu 2+ -mediated bipolar-type CMP is developed to maximize abundant active site utilization and enhance ion diffusion kinetics for durable, high energy-density, fast-charging LIB cathodes.

Language: Английский