摘要
金属氯化物-氯化胆碱(ChCl)深共晶溶剂(DES)和KOH水溶液反应可制备低维结构的纳米材料。为了验证在低维结构纳米材料的形成过程中水的作用,以乙二醇(EG)代替水溶解NaOH,EG-ChCl-氯化锌(ZnCl_(2))DES与NaOH的EG溶液在设定温度下混合,SEM图显示产物形貌在70℃和130℃时分别为纺锤形、纺锤形和花状结构的混合物,150℃和180℃时为无规则粒子;用EG-ZnCl_(2)DES代替EG-ChCl-ZnCl_(2)DES制备ZnO,产物形貌的变化过程类似,证明无水时得不到低维结构的纳米材料。循环伏安、电化学阻抗和充放电测试结果表明150℃制备的ZnO电化学性能最佳,其作为锌负极活性材料构筑的锌镍电池循环性能测试结果表明:最高能量密度为176.06 Wh/kg,第1 100次循环时具有169.17 Wh/kg的能量密度,库伦效率为96.6%左右,展现出良好的循环寿命。
Low-dimensional nanomaterials can be prepared by the reaction of metal chloride-choline chloride(ChCl)deep eutectic solvent(DES)with KOH aqueous solution.In order to verify the role of water in the formation of low-dimensional nanomaterials,ethylene glycol(EG)was used instead of water to dissolve NaOH,and EG-ChCl-zinc chloride(ZnCl_(2))DES was mixed with NaOH EG solution at a set temperature.SEM images showed that the product morphology was spindle-shaped,a mixture of spindle-shaped and flower-like structures at 70℃and 130℃,respectively,and irregular particles at 150℃and 180℃.Using EG-ZnCl_(2) DES instead of EG-ChCl-ZnCl_(2) DES,the morphology change process of ZnO prepared is similar,which proves that low-dimensional nanomaterials can not be obtained without water.Cyclic voltammetry,electrochemical impedance spectroscopy,and charge-discharge tests demonstrated that ZnO synthesized at 150℃exhibited optimal electrochemical performance.It was used as the active material to construct nickel-zinc batteries for cyclic performance testing.The results indicate that the highest energy density is 176.06 Wh/kg.The energy density of 169.17 Wh/kg and Coulombic efficiency of 96.6%were still maintained at 1100 th cycles,demonstrating excellent cycle life.
作者
蒋蔚
张鑫尧
赵娜娜
王海
沈俊诚
邱凯
关明云
JIANG Wei;ZHANG Xinyao;ZHAO Nana;WANG Hai;SHEN Juncheng;QIU Kai;GUAN Mingyun(School of Chemistry and Chemical Engineering,Jiangsu University of Technology,Changzhou 213001,China)
出处
《应用化工》
北大核心
2025年第8期2018-2023,2030,共7页
Applied Chemical Industry
基金
江苏省重点研发计划(社会发展)-面上项目(BE2021640)。
关键词
深共晶溶剂
氧化锌
锌镍电池
电化学性能
纳米材料
deep eutectic solvent
zinc oxide
nickel-zinc battery
electrochemical performance
nanomaterial
