Zinc Electrode Cycling in Deep Eutectic Solvent Electrolytes: An Electrochemical Study.
Zinc Electrode Cycling in Deep Eutectic Solvent Electrolytes: An Electrochemical Study.
复制标题
DOI：
10.3390/molecules28030957
复制
发表时间：
2023-01-18
期刊：
影响因子：
4.6
通讯作者：
Bozzini, Benedetto
中科院分区：
文献类型：
--
作者：
Emanuele, Elisa;Li Bassi, Andrea;Macrelli, Andrea;Mele, Claudio;Strada, Jacopo;Bozzini, Benedetto
在后锂离子电池技术中，锌阳极可充电化学物质因其理论能量密度高、制造成本低、原料易得和固有安全性而具有显著的技术前景。然而，锌阳极在水溶液中使用时，会发生析氢、钝化和形状变化。替代电解液可以帮助解决这些问题，保持水基电解液的绿色和安全特性。深共晶溶剂(DESS)是一种很有前途的绿色、低成本电池电解液非水溶剂。具体地说，DESS中锌阳极的循环是可逆的，这主要是因为它们具有抑制树枝晶的能力。然而，除了少数关于镀锌的研究外，对DESS中锌的阴极-阳极电化学的了解仍然非常有限。考虑到开发基于DES的电池电解液，关键是要考虑到潜在的缺点可能是它们的低离子导电性。在共晶混合物中加入高达40%的水分子，可以在不破坏共晶性质的情况下，增加电活性物质的扩散系数，降低电解液的粘度。在这项研究中，我们研究了锌在两种不同的水合DESS(CHU和CHEG加~30%H2O)中的电化学。通过锌锌对称CR2032硬币电池的恒流循环试验、电极的扫描电子显微镜成像和原位SERS光谱，完成了基于循环伏安法和计时电流法的不同阴极衬底上的基本电动和电结晶研究。本研究的结论是提出了一种特定的DES/H2O/ZnSO4基电解液，该电解液具有最佳的功能性能，并基于基本的电化学数据、形貌评估和循环响应模型进行了合理化。
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.
登录
查看更多内容
影响因子：
6.6
作者：
Arnaboldi, Serena;Mezzetta, Andrea;Mussini, Patrizia Romana
通讯作者：
Mussini, Patrizia Romana
影响因子：
19
作者：
Feldmann, C
通讯作者：
Feldmann, C
影响因子：
9.8
作者：
Haerens, Kurt;Matthijs, Edward;Van der Bruggen, Bart
通讯作者：
Van der Bruggen, Bart
影响因子：
9.8
作者：
Hammond, Oliver S.;Bowron, Daniel T.;Edler, Karen J.
通讯作者：
Edler, Karen J.
影响因子：
6
作者：
Di Pietro, Maria Enrica;Mele, Andrea
通讯作者：
Mele, Andrea