A "dynamic water microdomain" strategy to manipulate Zn anode reactions

Key Words:IN-SALT ELECTROLYTE; AQUEOUS RECHARGEABLE BATTERY

Abstract:The bonding state of H2O molecules determines the properties of electrolyte, which strongly impacts on the performance of electrode/battery. In this work, we utilized the nucleophilic sites at two ends of the hexanedinitrile (ADN) to coordinate with Zn2+ ions, which could release the bound H2O molecules in the Zn2+solvation sheath and form a dynamic cross-linked hydrophobic network. This dynamic hydrophobic network can disturb the hydrogen bonds (H-bonds) between H2O molecules, and confine H2O molecules within the grid to form many "dynamic water microdomain", further inhibiting the activity and decomposition of H2O. Theoretical calculations, Raman and NMR spectra verify that the water microdomain, solvation-sheath structure, electrochemical double layer (EDL) and the bonding state of H2O molecules can be regulated by the ADN additive. As a result, significant improvements in stability of electrode/battery and dendrite suppression can be achieved.

Volume:496

Issue:

Translation or Not:no