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Yalong Jiang1, Nan Jiang2, Yu Dou2

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Summary
This summary is machine-generated.

A new carbon nanotube@bipolar COF cathode enhances lithium-organic batteries with improved capacity and stability. This CNT@COF material offers faster charging and better performance, even at low temperatures.

Keywords:
bipolar organicscarbon nanotubecovalent organic frameworkhierarchical structurelithium–organic batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Covalent organic frameworks (COFs) show promise for lithium-organic batteries but face challenges like low voltage and poor conductivity.
  • Existing COF cathodes suffer from limited specific capacity and slow charge transport kinetics, hindering practical use.

Purpose of the Study:

  • To develop a novel carbon nanotube@bipolar COF (CNT@COF) core-shell heterostructure cathode for advanced lithium-organic batteries.
  • To overcome the limitations of current COF cathodes by enhancing electrochemical performance and charge transport.

Main Methods:

  • Fabrication of a 3D hybrid architecture integrating a conductive CNT core with COF shells.
  • Enrichment of COF shells with p-/n-type nitrogen electroactive sites for improved electron/ion transport.
  • Characterization using ex situ XPS, operando FTIR, and theoretical calculations to elucidate the charge storage mechanism.

Main Results:

  • The CNT@COF cathode achieved a high reversible capacity of 226.5 mAh g-1 and excellent rate capability (137 mAh g-1 at 5 A g-1).
  • Demonstrated long-term cycling stability with 82.5% capacity retention at 5 A g-1 over 5000 cycles.
  • Revealed a charge storage mechanism involving PF6 - anion interaction during p-type oxidation and Li+ cation binding during n-type reduction.

Conclusions:

  • The rationally designed CNT@COF cathode significantly outperforms existing COF-based organic cathodes.
  • The hybrid architecture enables rapid charge transport and maximizes electrochemical utilization, leading to high-energy and high-power densities.
  • The developed batteries show effective operation even under low-temperature conditions, indicating broad applicability.