Simultaneous regulation of solvation shell and ion migration in morpholine-crosslinked polyacrylamide hydrogel electrolytes for durable zinc metal batteries  

作　　者：Wei Wei Minghui Zhang Hui Yan Songbo Nan Zhongxiao Cong Yanfeng Dong Ao Tang 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China [2]Department of Chemistry.College of Sciences,Northeastern University,Shenyang 1189,Liaoning,Chin

出　　处：《Journal of Energy Chemistry》2025年第3期703-711,共9页能源化学(英文版)

基　　金：supported by the National Natural Science Foundation of China(22479022);the Natural Science Foundation of Liaoning Province(2020-MS-021)。

摘　　要：Aqueous zinc metal batteries(ZMBs)are vital to potable electronics and electric energy infrastructures because of their high energy conversion efficiency,high energy density,and environmental friendliness.However,rampant zinc dendrite growth and side reactions on the Zn anode seriously impede the practical application of ZMBs.In this work,morpholine-crosslinked polyacrylamide hydrogel electrolytes(ploy(acrylamide),6m-PAM)are successfully developed to simultaneously regulate solvation shell to suppress side reactions and homogenize Zn^(2+)ion migration for dendrite-free ZMBs.Notably,the 6m-PAM electrolyte exhibits excellent mechanical strength of 50.6 kPa,high Zn^(2+)ion conductivity of 52 mS cm^(-1)at room temperature,and fast self-healing ability,providing stable and adaptable electrolyte-anode interfaces.Experimental and theoretical calculation results reveal that Zn^(2+)-N(morpholine)coordination interaction effectively reshapes the primary solvation shell of Zn^(2+),suppressing the activity of free water and Zn dendrites.As a result,the 6m-PAM electrolyte endows symmetric zinc cells with a long-term cycling life of 2000 h at 7.5 mA cm^(-2).Notably,Zn/Polyaniline(PANI)batteries equipped with 6m-PAM electrolytes also exhibit a high capacity of 124 mA h g^(-1)at 1 A g^(-1)and a long cycling life of 4000 times with a high-capacity retention of 98.3%,This functional crosslinked hydrogel electrolyte paves a new way to construct durable dendrite-free ZMBs.

关 键 词：Hydrogel electrolytes Zn metal anodes Poly(acrylamide) Solvation shell Zn^(2+) ion migration 

分 类 号：TM911.1[电气工程—电力电子与电力传动]