Polyzwitterionic cross-linked double network hydrogel electrolyte enabling high-stable Zn anode  

作　　者：Mengyu Shi Junlong Zhang Guochuan Tang Ben Wang Sen Wang Xiaoxian Ren Guojie Li Weihua Chen Chuntai Liu Changyu Shen 

机构地区：[1]State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,China [2]College of Chemistry and Green Catalysis Center,Zhengzhou University,Zhengzhou 450001,China [3]Research Institute of Interdisciplinary Science and School of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523808,China

出　　处：《Nano Research》2024年第6期5278-5287,共10页纳米研究（英文版）

基　　金：the Science Technology and Innovation Team in University of Henan Province(No.24IRTSTHN002);the National Natural Science Foundation of China(No.22279121);China Postdoctoral Science Foundation(No.2022M712863),and DFT calculations were supported by the National Supercomputing Centre in Zhengzhou and the funding of Zhengzhou University.

摘　　要：Zn metal anode suffers from dendrite issues and passive byproducts,which severely plagues the practical application of aqueous Zn metal batteries.Herein,a polyzwitterionic cross-linked double network hydrogel electrolyte composed of physical crosslinking(hyaluronic acid)and chemical crosslinking(synthetic zwitterionic monomer copolymerized with acrylamide)is introduced to overcome these obstacles.On the one hand,highly hydrophilic physical network provides an energy dissipation channel to buffer stress and builds a H_(2)O-poor interface to avoid side reactions.On the other hand,the charged groups(sulfonic and imidazolyl)in chemical crosslinking structure build anion/cation transport channels to boost ions’kinetics migration and regulate the typical solvent structure[Zn(H_(2)O)_(6)]^(2+)to R-SO_(3)^(−)[Zn(H_(2)O)_(4)]^(2+),with uniform electric field distribution and significant resistance to dendrites and parasitic reactions.Based on the above functions,the symmetric zinc cell exhibits superior cycle stability for more than 420 h at a high current density of 5 mA·cm^(−2),and Zn||MnO_(2)full cell has a reversible specific capacity of 150 mAh·g^(−1)after 1000 cycles at 2 C with this hydrogel electrolyte.Furthermore,the pouch cell delivers impressive flexibility and cyclability for energy-storage applications.

关 键 词：Zn anode DENDRITES parasitic reactions polyzwitterion double network hydrogel electrolyte 

分 类 号：O63[理学—高分子化学]