共溶剂作用下锌沉积界面行为  

Interfacial Behavior of Zinc Metal Anode Deposition Under Co-Solvent Condition

作　　者：许宏吉 高睿 胡灵龙 马静怡 冯明[1] XU Hongji;GAO Rui;HU Linglong;MA Jingyi;FENG Ming(Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China)

机构地区：[1]吉林师范大学,功能材料物理与化学教育部重点实验室,长春130103

出　　处：《硅酸盐学报》2024年第7期2254-2263,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52171210,21978110);吉林省重点研发计划(20220201130GX)。

摘　　要：电解液共溶剂改性方法是一种调控金属锌负极沉积的有效方式。本文以添加四乙二醇二甲醚(TEGDME)为共溶剂的硫酸锌电解液体系为研究对象,通过准原位原子力显微镜(AFM),原位石英晶体微天平(E-QCM)和原位阻抗时域分析(EIS-DRT)对共溶剂化作用对金属锌负极沉积行为的影响进行了多尺度详细研究。首次从微观角度揭示了共溶剂可以通过影响双电层结构,稳定局域电场来调控金属锌的沉积行为。该工作为后续共溶剂体系的开发和水系锌离子电池的机理解析提供了一种全新的研究思路和研究角度。Introduction Aqueous zinc-ion battery is considered as one of the most promising candidates for large-scale energy storage device due to its low cost,high safety and recyclability.Compared with other alkali-based batteries,zinc-based batteries can realize energy storage through 2-electron charge transfer delivering a high specific capacity (820 mA·h/g) and low price.However,the existing development of zinc-ion battery is far from commercialization.Main challenges exhibit in three aspects,i.e.,a serious dendrite effect caused by the uneven deposition of zinc ions in the battery;uncontrollable water-induced parasitic reactions such as hydrogen evolution reaction (HER) in acidic electrolyte;and metal corrosion and irreversible side reactions on surface of anode.These challenges result in a low coulombic efficiency,a shorten cycle life of battery and even serious security risks.In order to solve the shortcomings of zinc anode,some methods (i.e.,zinc anode structure modification,electrolyte optimization and artificial interface layer (SEI) construction) are developed.Among them,a tunning electrolyte is a directive method to avoid negative side reactions and inhibit the dendrite growth.Electrolyte modification can realize a long-cycle-life zinc anode and a high efficient battery.In this paper,tetraethylene glycol dimethyl ether (TEGDME) was added into ZnSO_(4) based electrolyte as s co-solvent to investigate the plating/stripping behavior of Zn metal.The reaction mechanism of co-solvation effect from multi-scale was analyzed.Methods All reagents with analytical purity were used without any treatment.For the preparation of bare electrolyte,2.87 g of ZnSO_(4)·7H_(2)O was dissolved into 10 mL distilled water to prepare 1 mol/L ZnSO_(4) electrolyte.For the preparation of co-solvent electrolyte,2.87 g of dried lithium bistrifluoromethyl sulfonate (LITFSI) was dissolved into 10 mL dehydrated tetraethylene glycol dimethyl ether (TEGDME) in an argon glove box under stirring for overnight.The final concentration was controlle

关 键 词：金属锌负极 枝晶 共溶剂作用 原子力显微镜 电化学阻抗 

分 类 号：O64[理学—物理化学]