A hydrated deep eutectic electrolyte with finely-tuned solvation chemistry for high-performance zinc-ion batteries
A hydrated deep eutectic electrolyte with finely-tuned solvation chemistry for high-performance zinc-ion batteries
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一种用于高性能锌离子电池的水合深共晶电解质，具有精细调节的溶剂化化学
DOI：
10.1039/d3ee00462g
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发表时间：
2023-04-14
影响因子：
32.5
通讯作者：
He, Guanjie
中科院分区：
文献类型：
--
作者：
Chen, Ruwei;Zhang, Chengyi;He, Guanjie
尽管它们具有成本效益和本质安全性，但水性锌离子电池面临着源于各种活性水诱导的副反应的可逆性差的挑战。通过实验和理论方法系统地研究了水对溶剂化结构、电解质性质和电化学性能的影响，提出了一种具有贫水溶剂化结构（[Zn（H2O）（2）（eg）（2）（otf）（2）]）和降低体相溶液中游离水含量的水合深共晶电解质。该电解质可以显著抑制水诱导的副反应并提供高Zn 2+传质动力学，从而产生高度可逆的Zn阳极（类似于超过1000次循环的99.6%库仑效率和超过4500小时的稳定循环）和高容量Zn//NVO全电池（436 mA h g（-1））。本文的工作将有助于理解水溶液锌离子电池中电解质溶剂化结构-电解质性质-电化学性能之间的关系。
Despite their cost-effectiveness and intrinsic safety, aqueous zinc-ion batteries have faced challenges with poor reversibility originating from various active water-induced side reactions. After systematically scrutinizing the effects of water on the evolution of solvation structures, electrolyte properties, and electrochemical performances through experimental and theoretical approaches, a hydrated deep eutectic electrolyte with a water-deficient solvation structure ([Zn(H2O)(2)(eg)(2)(otf)(2)]) and reduced free water content in the bulk solution is proposed in this work. This electrolyte can dramatically suppress water-induced side reactions and provide high Zn2+ mass transfer kinetics, resulting in highly reversible Zn anodes (similar to 99.6% Coulombic efficiency over 1000 cycles and stable cycling over 4500 h) and high capacity Zn//NVO full cells (436 mA h g(-1)). This work will aid the understanding of electrolyte solvation structure-electrolyte property-electrochemical performance relationships of aqueous electrolytes in aqueous zinc-ion batteries.