N,N-dimethylformamide tailors solvent effect to boost Zn anode reversibility in aqueous electrolyte  

作　　者：Yilin Ma Qiu Zhang Luojia Liu Yixin Li Haixia Li Zhenhua Yan Jun Chen 

机构地区：[1]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Renewable Energy Conversion and Storage Center(RECAST),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《National Science Review》2022年第10期141-151,共11页国家科学评论（英文版）

基　　金：supported by the National Programs for Nano–Key Projects (2017YFA0206700, 2016YFA0202500and 2018YFB1502101);the National Natural Science Foundation of China (22020102002, 21835004, 21673243,52001171 and 51771094);the Haihe Laboratory of Sustainable Chemical Transformations for financial support

摘　　要：Rechargeable aqueous Zn batteries are considered as promising energy-storage devices because of their high capacity,environmental friendliness and low cost.However,the hydrogen evolution reaction and growth of dendritic Zn in common aqueous electrolytes severely restrict the application of Zn batteries.Here,we develop a simple strategy to suppress side reactions and boost the reversibility of the Zn electrode.By introducing 30%(volume fractions)N,N-dimethylformamide(DMF)to the 2 M Zn(CF_(3)SO_(3))_(2)–H_(2)O electrolyte(ZHD30),the preferential hydrogen-bonding effect between DMF and H_(2)O effectively reduces the water activity and hinders deprotonation of the electrolyte.The ZHD30 electrolyte improves the Zn plating/stripping coulombic efficiency from∼95.3%to∼99.4%and enhances the cycles from 65 to 300.The Zn–polyaniline full battery employing the ZHD30 electrolyte can operate over a wide temperature range from–40℃to+25℃and deliver capacities of 161.6,127.4 and 65.8 mAh g^(–1)at 25,–20 and–40℃,respectively.This work provides insights into the role of tuning solvent effects in designing low-cost and effective aqueous electrolytes.

关 键 词：aqueous electrolyte Zn reversibility hydrogen bond solvent effect rechargeable Zn battery 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.1[理学—物理化学]