2D anionic nanosheet additive for stable Zn metal anodes in aqueous electrolyte
Publication Name
Chemical Engineering Journal
Abstract
Metallic Zinc (Zn) has attracted great attention as a promising anode for aqueous batteries owing to its high theoretical capacity, low cost, and high natural abundance. However, Zn anode suffers from a crucial challenge, namely the growth of Zn dendrites, which brings not only a short life span but also severe safety concerns. In this work, we report that anionic tin sulfide nanosheets (TS-Ns) server as electrolyte additive to mitigate the dendrite growth. The negatively charge TS-Ns can attract the positive Zn2+ from the electrolyte through electrostatic interaction and increase the local concentration of Zn2+. Moreover, TS-Ns can co-deposit with Zn2+ at the initial deposition stage and then form an interfacial protection layer around the Zn surface, guiding the uniform deposition of Zn on cycling. The TS-Ns additive endow the Zn anode with excellent performance, reflected by stable cycling for 3700 h in a symmetric cell with a capacity of 0.2 mAh /cm2 and for 500 cycles in an asymmetric cell with an average coulombic efficiency of 99.6%. These merits bring high capacity and low polarization in Zn||MnO2 full cells. We believe that TS-Ns additive provides a new pathway to achieve high-performance Zn metal anodes in aqueous electrolytes.
Open Access Status
This publication is not available as open access
Volume
430
Article Number
133042
Funding Number
DP160102627
Funding Sponsor
Australian Research Council