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Ultrastable Zinc Anode Enabled by CO2-Induced Interface Layer.

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Summary

Introducing carbon dioxide (CO2) gas into aqueous zinc-ion batteries (AZIBs) suppresses zinc anode degradation. This simple method enhances battery lifespan and efficiency for sustainable energy storage.

Keywords:
CO2-purged electrolyteZn corrosionaqueous Zn-ion batteriesdendrite-free anodedissolved oxygensolid interface layer

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Aqueous zinc-ion batteries (AZIBs) are promising for large-scale energy storage due to safety and cost-effectiveness.
  • Conventional AZIBs face challenges with zinc anode corrosion, side reactions, and dendrite growth, limiting efficiency and lifespan.

Purpose of the Study:

  • To investigate the impact of purging carbon dioxide (CO2) gas into AZIB electrolytes.
  • To address critical issues of zinc anode instability and improve battery performance.

Main Methods:

  • Purging CO2 gas into the electrolyte of AZIBs.
  • Analyzing the formation of a ZnCO3 solid electrolyte interphase (SEI) layer.
  • Evaluating electrochemical performance in symmetrical and full cells.

Main Results:

  • CO2 purging effectively removes dissolved oxygen and buffers local pH, inhibiting side reactions.
  • In situ formation of a ZnCO3 SEI layer prevents dendrite growth and promotes reversible zinc plating/stripping.
  • CO2-purged cells demonstrated high Coulombic efficiency (99.97%), an ultralong lifespan (32,000 cycles), and stable cycling at high current densities.

Conclusions:

  • CO2 gas purging is a simple, scalable, and cost-effective strategy to stabilize zinc anodes in AZIBs.
  • This method significantly enhances the electrochemical performance and cycle life of AZIBs.
  • The findings offer a viable pathway for the commercialization of AZIB technology.