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Anodic Metal-Organic Frameworks Enabling Functional Ionic Distributor Sustains Stable Aqueous Zinc Metal Anodes.

Zhendong Hao1, Wenqing Yao1, Wenjie Li1

  • 1School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, P. R. China.

Chemistry, an Asian Journal
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Summary

Researchers developed a functional ionic distributor (FID) using metal-organic frameworks on separators to improve aqueous zinc-ion batteries (AZIBs). This innovation enhances zinc ion transport and suppresses dendrite formation for stable battery performance.

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anodic metal–organic frameworksaqueous zinc‐ion batteriesionic transportseparatorszinc dendrites

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) offer safe and cost-effective energy storage.
  • Zinc dendrite formation limits AZIBs' cyclic stability and safety.
  • Optimizing ion transport is crucial for AZIB development.

Purpose of the Study:

  • To design a functional ionic distributor (FID) for enhancing Zn2+ ion transport in AZIBs.
  • To inhibit anion migration and suppress zinc dendrite formation.
  • To improve the cyclic stability and overall performance of AZIBs.

Main Methods:

  • Coating anodic metal-organic frameworks (MOFs) onto commercial glass fiber separators (GF) to create the FID.
  • Characterizing the FID's ionic transport properties, including Zn2+ transference number and ionic conductivity.
  • Evaluating the electrochemical performance of Zn symmetric cells using the FID, including cyclic stability tests.
  • Conducting theoretical simulations to understand ion transport mechanisms.

Main Results:

  • The FID achieved a high Zn2+ transference number of 0.79 due to abundant nanochannels.
  • The modified separator exhibited high ionic conductivity (34.48 mS cm-1).
  • Zn symmetric cells with FID demonstrated superior cyclic stability (300 h at 1 mA cm-2 / 5 mAh cm-2 and 130 h at 0.5 mA cm-2 / 2.5 mAh cm-2) compared to bare GF separators.
  • Theoretical simulations confirmed suppressed sulfate ion transport within the MOFs.

Conclusions:

  • The developed FID effectively regulates Zn2+ ion distribution and inhibits anion migration.
  • Functional separators based on MOFs offer a promising strategy for constructing stable AZIBs.
  • This approach addresses key challenges in AZIB technology, paving the way for safer and more durable batteries.