Ethylene Glycol ‐Choline Chloride Based Hydrated Deep Eutectic Electrolytes Enabled High‐Performance Zinc‐Ion Battery

Ethylene glycol-choline chloride (Eg-ChCl) based hydrated deep-eutectic electrolytes (HDEEs) are proposed for RZIBs. The formulated HDEEs, particularly 1-0.5-4-2 HDEE, exhibit the lowest viscosity, highest Zn2+ conductivity, and the highest Zn2+ transference number. Additionally, 1-0.5-4-2 HDEE provides a wide electrochemical stability window, enables dendrite-free zinc stripping/plating cycling, and enhanced zinc-ion storage performance. AbstractAqueous rechargeable zinc-ion batteries (ARZIBs) are considered as an emerging energy storage technology owing to their low cost, inherent safety, and reasonable energy density. However, significant challenges associated with electrodes, and aqueous electrolytes restrict their rapid development. Herein, ethylene glycol-choline chloride (Eg-ChCl) based hydrated deep-eutectic electrolytes (HDEEs) are proposed for RZIBs. Also, a novel V10O24·nH2O@rGO composite is prepared and investigated in combination with HDEEs. The formulated HDEEs, particularly the composition of 1  ml of EG, 0.5 g of ChCl, 4 ml of H2O, and 2  M ZnTFS (1-0.5-4-2 HDEE), not only exhibit the lowest viscosity, highest Zn2+ conductivity (20.38  mS cm−1), and the highest zinc (Zn) transference number (t+ = 0.937), but also provide a wide electrochemical stability window (>3.2  V vs ZnǁZn2+) and enabledendrite-free Zn stripping/plating cycling over 1000 hours. The resulting Zn ǁV10O24·nH2O@rGO cell  with 1-0.5-4-2 HDEE manifests high reversible capacity ...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research