Unraveling the exceptional kinetics of Zn‖organic batteries in hydrated deep eutectic solution  

作　　者：Duo Chen Yuanhang Wang Tengyu Yao Hang Yang Laifa Shen 

机构地区：[1]Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,Jiangsu,China [2]Christopher Ingold Laboratory,Department of Chemistry,University College London,London WC1H OAJ,UK

出　　处：《Journal of Energy Chemistry》2025年第2期570-577,I0012,共9页能源化学(英文版)

基　　金：financial support from the National Natural Science Foundation of China(NSFC No.52202253,52072173);Natural Science Foundation of Jiangsu Province(No.BK20220914);Fundamental Research Funds for the Central Universities(No.ILA22061,ILA22075);Large Instrument and Equipment Sharing Fund of NUAA.

摘　　要：Intuitively,the solvation structure featuring stronger interacted sheath in deep eutectic solution(DES)electrolyte would result in sluggish interfacial charge transfer and intense polarization,which obstructs its practical application in emerging Zn based batteries.Unexpectedly,here we discover a Zn‖organic battery with exceptional kinetics properties enabled by a hydrated DES electrolyte,which can render higher discharge capacity,smaller voltage polarization,and faster kinetics of charge transfer in comparison with conventional aqueous 3 M ZnCl_(2)electrolyte,though its viscosity is two orders of magnitude higher than the latter.The improved kinetics of charge transfer and ion diffusion is demonstrated to originate from the local electron structure regulation of cathode in hydrated DES electrolyte.Furthermore,the DES electrolyte has also been shown to restrict parasitic reaction associated with active water by preferential urea-molecular adsorption on Zn surface and stronger water trapping in solvation structure,giving rise to long-term stable dendrite-free Zn plating/stripping.This work provides a new rationale for understanding electrochemical behaviors of organic cathodes in DES electrolyte,which is conducive to the development of high-performance Zn‖organic batteries.

关 键 词：Zn-based battery Deep eutectic KINETICS Dendrite-free 

分 类 号：TM912[电气工程—电力电子与电力传动]