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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...

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Related Experiment Video

Updated: May 8, 2025

Zinc-Sponge Battery Electrodes that Suppress Dendrites

Zinc-Sponge Battery Electrodes that Suppress Dendrites

Published on: September 29, 2020

Fast Kinetics Enabled by Ion Enrichment Layer for Dendrite-Free Zinc Anode.

Yujuan Pu¹, Youkui Zhang², Kaiyuan Zhan¹

¹College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 401331, P. R. China.

|December 24, 2024

Summary

A novel copper sulfide (CuS) layer prevents zinc dendrite growth in aqueous zinc-ion batteries (AZIBs), enhancing battery safety and lifespan. This breakthrough enables stable and efficient energy storage for practical applications.

Keywords:

Zn anode Zn deposition dendrite−free ion enrichment layer kinetics

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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.
Uncontrolled zinc (Zn) anode dendrite growth limits AZIBs' practical application and cycle life.

Purpose of the Study:

To develop a dendrite-free Zn anode for enhanced AZIB performance.
To investigate the efficacy of a novel ion enrichment layer for stabilizing Zn deposition.

Main Methods:

A copper sulfide (CuS) ion enrichment layer was designed and constructed on Zn foil.
Electrochemical performance was evaluated using plating/stripping tests and full battery assembly with MnO2 cathode.

Main Results:

The CuS layer facilitated uniform Zn deposition by reducing de-solvation barriers and nucleation overpotential.
The CuS@Zn anode demonstrated excellent reversibility over 1000 hours at 1 mA cm⁻² and 900 hours at 5 mA cm⁻².
The assembled CuS@Zn||MnO2 full battery exhibited superior rate capability and cycling stability.

Conclusions:

The CuS ion enrichment layer effectively suppresses Zn dendrite formation.
This strategy significantly enhances the stability and electrochemical performance of AZIBs.
The study presents a viable approach for stabilizing Zn anodes in aqueous batteries.