Dual‐Salt Chaotropic Eutectic Electrolyte for Enhancing Low‐Temperature Zinc‐Ion Batteries

Abstract Aqueous zinc‐ion batteries (ZIBs) exhibit severe performance degradation at low temperatures primarily due to the freezing of water. To mitigate this issue, we engineered a dual‐salt super‐chaotropic eutectic electrolyte that exploits the strong Hofmeister effect of zinc salts to disrupt the ordered hydrogen‐bonding network of the electrolyte, significantly lowering its freezing point. The electrolyte, formulated with Zn(ClO 4 ) 2 ·6H 2 O, NaClO 4 ·H 2 O, and acetamide, leverages the strong chaotropic properties of ClO 4 − ions to dismantle the hydrogen bonding network of water molecules, realizing an ultra‐low freezing point of −75.9 °C. Additionally, the electrolyte minimizes water activity,…

• NN
  National Natural Science Foundation of China

  Award: 52402277
• CP
  China Postdoctoral Science Foundation

  Award: 2024M761749