电解质
电化学窗口
计时安培法
循环伏安法
深共晶溶剂
电化学
共晶体系
阳极
材料科学
无机化学
电池(电)
化学工程
钝化
线性扫描伏安法
水溶液
电极
化学
离子电导率
纳米技术
冶金
有机化学
物理化学
合金
功率(物理)
量子力学
工程类
图层(电子)
物理
作者
Elisa Emanuele,Andrea Bassi,Andrea Macrelli,Claudio Mele,Jacopo Strada,Benedetto Bozzini
出处
期刊:Molecules
[MDPI AG]
日期:2023-01-18
卷期号:28 (3): 957-957
被引量:5
标识
DOI:10.3390/molecules28030957
摘要
Among post-lithium ion battery technologies, rechargeable chemistries with Zn anodes bear notable technological promise owing to their high theoretical energy density, lower manufacturing cost, availability of raw materials and inherent safety. However, Zn anodes, when employed in aqueous electrolytes, suffer from hydrogen evolution, passivation, and shape changes. Alternative electrolytes can help tackle these issues, preserving the green and safe characteristics of aqueous-based ones. Deep eutectic solvents (DESs) are promising green and low-cost non-aqueous solvents for battery electrolytes. Specifically, the cycling of Zn anodes in DESs is expected to be reversible, chiefly owing to their dendrite-suppression capability. Nevertheless, apart from a few studies on Zn plating, insight into the cathodic–anodic electrochemistry of Zn in DESs is still very limited. In view of developing DES-based battery electrolytes, it is crucial to consider that a potential drawback might be their low ionic conductivity. Water molecules can be added to the eutectic mixtures by up to 40% to increase the diffusion coefficient of the electroactive species and lower the electrolyte viscosity without destroying the eutectic nature. In this study, we address the electrochemistry of Zn in two different hydrated DESs (ChU and ChEG with ~30% H2O). Fundamental electrokinetic and electrocrystallization studies based on cyclic voltammetry and chronoamperometry at different cathodic substrates are completed with a galvanostatic cycling test of Zn|Zn symmetric CR2032 coin cells, SEM imaging of electrodes and in situ SERS spectroscopy. This investigation concludes with the proposal of a specific DES/H2O/ZnSO4-based electrolyte that exhibits optimal functional performance, rationalized on the basis of fundamental electrochemical data, morphology evaluation and modeling of the cycling response.
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