Aqueous Zn-ion batteries (AZIBs) have been regarded as promising alternatives to Li-ion batteries due to their advantages, such as low cost, high safety, and environmental friendliness. However, AZIBs face significant challenges in limited stability and lifetime owing to zinc dendrite growth and serious side reactions caused by water molecules in the aqueous electrolyte during cycling. To address these issues, a new eutectic electrolyte based on Zn(ClO4)2·6H2O-N-methylacetamide (ZN) is proposed in this work. Compared with aqueous electrolyte, the ZN eutectic electrolyte containing organic N-methylacetamide could regulate the solvated structure of Zn2+, effectively suppressing zinc dendrite growth and side reactions. As a result, the Zn//NH4V4O10 full cell with the eutectic ZN-1-3 electrolyte demonstrates significantly enhanced cycling stability after 1000 cycles at 1 A g−1. Therefore, this study not only presents a new eutectic electrolyte for zinc-ion batteries but also provides a deep understanding of the influence of Zn2+ solvation structure on the cycle stability, contributing to the exploration of novel electrolytes for high-performance AZIBs.

中文翻译：

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新型 N-甲基乙酰胺基共晶电解质对高性能锌离子电池的 Zn2+ 溶剂化壳层的调控


水系锌离子电池 （AZIB） 因其低成本、高安全性和环保等优点而被认为是锂离子电池的有前途的替代品。然而，由于锌枝晶的生长和循环过程中水性电解质中水分子引起的严重副反应，AZIB 在稳定性和使用寿命方面面临重大挑战。为了解决这些问题，本工作提出了一种基于 Zn（ClO4）2·6H2O-N-甲基乙酰胺 （ZN） 的新型共晶电解质。与水性电解质相比，含有有机 N-甲基乙酰胺的 ZN 共晶电解质可以调节 Zn2+ 的溶剂化结构，有效抑制锌枝晶的生长和副反应。结果，具有共晶 ZN-1-3 电解质的 Zn//NH4V4O10 全电池在 1 A g-1 下循环 1000 次后表现出显着增强的循环稳定性。因此，本研究不仅提出了一种新的锌离子电池共晶电解质，而且为深入了解 Zn2+ 溶剂化结构对循环稳定性的影响，有助于探索用于高性能 AZIB 的新型电解质。