Affiliation:
1. School of Chemical Engineering Sungkyunkwan University Suwon Gyeonggi 16419 Republic of Korea
2. Advanced Materials Division Korea Research Institute of Chemical Technology 141 Gajeong‐ro, Yuseong‐gu Daejeon 34114 Republic of Korea
Abstract
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 ZnǁV10O24·nH2O@rGO cell with 1‐0.5‐4‐2 HDEE manifests high reversible capacity of ≈365 mAh g−1 at 0.1 A g−1, high rate‐performance (delivered ≈365/223 mAh g−1 at 0.1/10 mA g−1) and enhanced cycling performance (≈63.10% capacity retention in the 4000th cycle at 10 A g−1). Furthermore, 1‐0.5‐4‐2 HDEE support feasible Zn‐ion storage performance across a wide temperature range (0–80 °C) FInally, a ZnǁV10O24·nH2O@rGO pouch‐cell prototype fabricated with 1‐0.5‐4‐2 HDEE demonstrates good flexibility, safety, and durability.
Funder
National Research Foundation of Korea
Ministry of Science and ICT, South Korea
Cited by
1 articles.
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