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Ultrastable Zinc Anode Enabled by CO₂-Induced Interface Layer.

Yuxuan Zhu¹, Hui Ying Hoh², Shangshu Qian²

¹Queensland Micro- and Nanotechnology Centre, School of Environment and Science, Nathan Campus, Griffith University, Brisbane, Queensland 4111, Australia.

|September 6, 2022

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 electrolyte Zn corrosion aqueous Zn-ion batteries dendrite-free anode dissolved oxygen solid 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.