Dendrite Suppression in Zn Batteries Through Hetero-Epitaxial Residual Stresses Shield

TL;DR

This study demonstrates that layered coatings induce residual stresses on zinc anodes, significantly reducing dendrite growth in aqueous zinc-ion batteries through experimental and numerical analysis.

Contribution

It reveals that hetero-epitaxial residual stresses from layered coatings suppress dendrites, providing a new strategy for improving metal anode battery stability.

Findings

Residual stresses reduce chemical potential polarization around dendrites

Layered coatings slow dendritic growth rate

Dendrite suppression observed with single and few-layer coatings

Abstract

Dendrite formation is a long-standing problem for the commercial application of aqueous zinc (Zn)-ion batteries (AZIB). Here, we investigate the effect of hetero-epitaxial residual stresses due to layered coatings on dendrite suppression. We found that atomic and molecular layered coatings can substantially reduce dendritic growth in AZIB by providing shielding due to residual stresses, even at single and a few layers of coatings. Through a combined experimental and numerical approach, we demonstrate that the residual stresses developed due to the coating of the Zn anodes significantly reduced the chemical potential polarization around dendrite embryos, forcing the deposition of zinc in the regions adjacent to the protuberances. This, in turn, results in a slower rate of dendritic growth, and eventually, dendrite suppression. The fundamental understanding of the effect of residual stresses due to coatings demonstrated herein can be extended to various metal anode batteries such as Li or Na.