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Zinc-Sponge Battery Electrodes that Suppress Dendrites

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Regulating the Interfacial Charge Density by Constructing a Novel Zn Anode-Electrolyte Interface for Highly

Shengkang Zhan¹, Yiming Guo¹, Kai Wu²

¹Institute for Sustainable Energy, College of Sciences, Shanghai University, Shanghai, 20044, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|November 1, 2023

Summary

Researchers improved aqueous zinc-ion batteries (AZIBs) by using amidinothiourea (ATU) to regulate charge density at the zinc anode interface. This prevents dendrites and corrosion, enhancing battery lifespan and efficiency.

Keywords:

anode-electrolyte interface interfacial charge density reversibility zinc anode zinc-ion battery

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

Area of Science:

Electrochemistry
Materials Science
Energy Storage

Background:

Aqueous zinc-ion batteries (AZIBs) are promising for energy storage but suffer from zinc dendrites and corrosion due to uneven charge distribution at the anode-electrolyte interface.
These issues limit the cycling stability and safety of AZIBs.

Purpose of the Study:

To develop a facile and scalable strategy to regulate the charge density at the zinc anode-electrolyte interface.
To improve the cycling performance and Coulombic efficiency of AZIBs by mitigating dendrite formation and corrosion.

Main Methods:

Employed amidinothiourea (ATU) as an interfacial charge modifier for the zinc anode.
Investigated the effect of ATU on interfacial charge distribution, ion migration, and desolvation behavior.
Tested the performance of modified zinc anodes in Zn||Cu and Zn||I2 battery configurations.

Main Results:

Achieved uniform and increased interfacial charge distribution on the zinc anode with trace ATU (0.01 mg/mL).
Observed enhanced Zn2+ migration and desolvation due to Zn-N bonds and hydrogen bonds formed by ATU.
Demonstrated a long cycling life (>800 h) and high Coulombic efficiency (99.52%) for Zn||Cu batteries.
Attained improved cycling stability (5000 cycles, 77.9% capacity retention) for Zn||I2 batteries.

Conclusions:

Regulating interfacial charge density is crucial for stable AZIB operation.
ATU effectively modifies the zinc anode-electrolyte interface, suppressing dendrites and corrosion.
This strategy offers a promising pathway for developing high-performance and durable aqueous zinc-ion batteries.