Water-Restrained Hydrogel Electrolytes with Repulsion-Driven Cationic Express Pathways for Durable Zinc-Ion Batteries  

作　　者：Dewu Lin Yushuang Lin Ruihong Pan Jiapei Li Anquan Zhu Tian Zhang Kai Liu Dongyu Feng Kunlun Liu Yin Zhou Chengkai Yang Guo Hong Wenjun Zhang 

机构地区：[1]Department of Materials Science and Engineering&Center of Super-Diamond and Advanced Films(COSDAF),City University of Hong Kong,Kowloon 999077,People’s Republic of China [2]College of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,People’s Republic of China [3]The Shenzhen Research Institute,City University of Hong Kong,Shenzhen 518057,People’s Republic of China

出　　处：《Nano-Micro Letters》2025年第8期320-332,共13页纳微快报(英文版)

基　　金：financially supported by the General Research Fund(CityU 11315622 and CityU 11310123);National Natural Science Foundation(NSFC 52372229 and NSFC 52172241);Green Tech Fund(GTF202220105);Guangdong Basic and Applied Basic Research Foundation(2024A1515011008);City University of Hong Kong(No.9020002);the Shenzhen Research Institute of City University of Hong Kong.

摘　　要：The development of flexible zinc-ion batteries(ZIBs)faces a threeway trade-off among the ionic conductivity,Zn^(2+)mobility,and the electrochemical stability of hydrogel electrolytes.To address this challenge,we designed a cationic hydrogel named PAPTMA to holistically improve the reversibility of ZIBs.The long cationic branch chains in the polymeric matrix construct express pathways for rapid Zn^(2+)transport through an ionic repulsion mechanism,achieving simultaneously high Zn^(2+)transference number(0.79)and high ionic conductivity(28.7 mS cm−1).Additionally,the reactivity of water in the PAPTMA hydrogels is significantly inhibited,thus possessing a strong resistance to parasitic reactions.Mechanical characterization further reveals the superior tensile and adhesion strength of PAPTMA.Leveraging these properties,symmetric batteries employing PAPTMA hydrogel deliver exceeding 6000 h of reversible cycling at 1 mA cm^(−2) and maintain stable operation for 1000 h with a discharge of depth of 71%.When applied in 4×4 cm2 pouch cells with MnO_(2) as the cathode material,the device demonstrates remarkable operational stability and mechanical robustness through 150 cycles.This work presents an eclectic strategy for designing advanced hydrogels that combine high ionic conductivity,enhanced Zn^(2+)mobility,and strong resistance to parasitic reactions,paving the way for long-lasting flexible ZIBs.

关 键 词：Zinc-ion battery Hydrogel electrolyte Cation conduction Ionic repulsion Water state 

分 类 号：TM912[电气工程—电力电子与电力传动]