Directing Zn Growth with Biased Adsorption of Straight-chain Molecules for Superior Zn Anode Stability

Aqueous zinc ion batteries (AZIBs), which have attracted attentions in the field of energy storage, is affected by dendrites and side reactions of Zn anode, resulting in an unsatisfactory performance of AZIBs. Herein, we propose a biased adsorption strategy mediated by straight-chain molecule (Scm) for stabilizing Zn anode. The dual polar termini of Scms guaranties securely anchor themselves in a parallel orientation upon the Zn anode surface. This provides a comprehensive coverage, effectively sequestering water molecules from the Zn anode and precipitating the formation of a water-depleted electric double layer (EDL). Furthermore, the Scms selectively adsorb along the (002) crystallographic planes, guiding the deposition of Zn2+. Consequently, the incorporation of these Scms successfully mitigates anode corrosion, HER, and dendrites. The Zn||Zn, Zn||Cu and Zn||V6O13 cells with Scms display significantly enhanced electrochemical performance, especially at elevated temperature of 60 °C. This work highlights the potential of cost-effective, straight-chain electrolyte additives for enhancing Zn anode stability.