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Stabilizing a zinc anode via a tunable covalent organic framework-based solid electrolyte interphase.

Vipada Aupama1, Wathanyu Kao-Ian1, Jinnawat Sangsawang1

  • 1Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand. soorathep.k@chula.ac.th.

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Summary
This summary is machine-generated.

Covalent organic frameworks (COFs) create a protective layer on zinc anodes, preventing corrosion and dendrite formation in aqueous batteries. This enhances battery stability and performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemistry

Background:

  • Zinc anodes are promising for aqueous rechargeable batteries but suffer from corrosion and dendrite formation.
  • These issues limit the cycle life and safety of zinc-based batteries.
  • An artificial solid electrolyte interphase (ASEI) is a viable strategy to protect the zinc anode.

Purpose of the Study:

  • To fabricate a covalent organic framework (COF) as an ASEI for zinc anodes.
  • To investigate the protective effect of COFs against water-induced side reactions.
  • To evaluate the electrochemical performance of COF-protected zinc anodes in aqueous electrolytes.

Main Methods:

  • Fabrication of COF ASEI (HqTp and BpTp) on zinc anode surface via Schiff base reactions.
  • Electrochemical testing using symmetrical cells for zinc plating/stripping.
  • Evaluation of full cells with COF-protected zinc anodes.

Main Results:

  • COFs effectively regulate zinc-ion flux, leading to dendrite-free zinc deposition.
  • COFs mitigate hydrogen evolution reaction (HER) and irreversible passive layer formation.
  • HqTpCOF@Zn exhibited superior stability and coulombic efficiency compared to bare Zn.
  • Full cells with COFs@Zn showed significantly improved cyclability.

Conclusions:

  • Covalent organic frameworks (COFs) are effective ASEI materials for stabilizing zinc anodes in aqueous electrolytes.
  • COF-based ASEI enhances the electrochemical performance and cycle life of aqueous rechargeable batteries.
  • This work highlights the potential of COFs for advanced energy storage applications.