Dendrite Issues for Zinc Anodes in a Flexible Cell Configuration for Zinc-Based Wearable Energy-Storage Devices

A key application of aqueous rechargeable Zn-based batteries (RZBs) is flexible and wearable energy storage devices (FESDs). Current studies and optimizations of Zn anodes have not considered the special flexible working modes needed. In this study, we present the Zn accumulation on the folded line and curve areas of flexible anodes. The correlation between the bending radius and the lifespan of symmetric cells is proposed. The interface contact of hydrogel electrolytes when working in a bending mode is another key factor affecting cell lifespan. After detailed analysis, the ideal cell configuration is shown to be hydrogel electrolytes with suitable chemistry, satisfactory mechanical properties, and high adhesivity. Thus a water in salt (WIS) hydrogel is proposed that demonstrates a highly stable cell performance. This work provides a new perspective in Zn anode research for the development of FESDs.

Automated summary

This study investigates the zinc accumulation issue on the folded and curved areas of flexible anodes and proposes a correlation between the bending radius and cell lifespan. The interface contact of hydrogel electrolytes is identified as a key factor affecting the cell lifespan when working in a bending mode. By conducting detailed analysis, it is found that water in salt (WIS) hydrogel with suitable chemistry, satisfactory mechanical properties, and high adhesivity demonstrates highly stable cell performance. This work provides a new perspective in zinc anode research for the development of flexible and wearable energy storage devices.