Highly stable aqueous Zn-ion batteries are of great importance for commercial applications. The challenging issues of interfacial side reactions and rampant dendrite growth cause short circuit and premature failure of aqueous Zn-ion batteries. Herein, a hydrated deep eutectic electrolyte is formulated to tackle such problems, which adopts 1,3-propanediol as a cosolvent. 1,3-Propanediol molecules can enter into the Zn²⁺ solvation structure to from a lean-water electrolyte and drastically diminish the activity of water molecules through reinforcing the hydrogen bond network. Meanwhile, PDO molecules exclude the neighboring water to modulate the electric double layer configuration, thus impeding water-mediated side reactions and inducing an inorganic-rich interphase. Consequently, this hydrated deep eutectic electrolyte ensures long-term stability of Zn–Zn, Zn–Cu, and Zn–I₂ cells. The favorable influence exerted by PDO molecules provides the guidance for constructing high-performance aqueous Zn-ion batteries.

中文翻译：

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重新配置深共晶电解质中的配位结构以实现锌离子电池的稳定运行


高度稳定的水性锌离子电池对于商业应用非常重要。界面副反应和猖獗的枝晶生长等具有挑战性的问题会导致水性锌离子电池短路和过早失效。本文配制了一种水合深共晶电解质来解决此类问题，采用 1,3-丙二醇作为助溶剂。1,3-丙二醇分子可以从贫水电解质进入 Zn²⁺ 溶剂化结构，并通过增强氢键网络大大降低水分子的活性。同时，PDO 分子排除了相邻的水以调节双电层构型，从而阻碍了水介导的副反应并诱导了富含无机物的界面。因此，这种水合的深共晶电解质确保了 Zn-Zn、Zn-Cu 和 Zn-I₂ 电池的长期稳定性。PDO 分子发挥的有利影响为构建高性能水系 Zn 离子电池提供了指导。