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Superionic conduction in a Mg2+-containing covalent organic framework at intermediate temperature.

Akinori Mohri1, Yuki Oami1, Masaaki Sadakiyo1

  • 1Department of Applied Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan. sadakiyo@rs.tus.ac.jp.

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Summary
This summary is machine-generated.

Researchers achieved superionic conduction in a novel magnesium-containing covalent organic framework (COF) without guest vapors. This material demonstrates significant ionic conductivity at intermediate temperatures, paving the way for new solid-state electrolytes.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Polymer Science

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with tunable structures.
  • Superionic conduction typically requires high temperatures or the presence of guest molecules.
  • Developing solid-state electrolytes with high ionic conductivity is crucial for advanced energy storage.

Purpose of the Study:

  • To synthesize a Mg2+-containing COF with integrated polymer chains.
  • To investigate the ionic conductivity of the synthesized material under anhydrous conditions.
  • To explore the potential of COFs as solid-state electrolytes.

Main Methods:

  • Synthesis of a specific COF (TPB-PEO-9-COF-Mg) incorporating Mg2+ carriers and polyethylene oxide (PEO) chains.
  • Characterization of the COF's structure and composition.
  • Electrochemical impedance spectroscopy to measure ionic conductivity.

Main Results:

  • Successful synthesis of TPB-PEO-9-COF-Mg.
  • Observation of superionic conductivity (> 10^-4 S cm^-1) at 160 °C in dry N2.
  • Demonstration of conduction in the absence of guest vapors.

Conclusions:

  • Mg2+-containing COFs with polymer chains can exhibit superionic conduction.
  • This material represents a promising candidate for anhydrous solid-state electrolytes.
  • The findings open new avenues for designing functional COFs for electrochemical applications.