Probe the Localized Electrochemical Environment Effects and Electrode Reaction Dynamics for Metal Batteries using In Situ 3D Microscopy
Probe the Localized Electrochemical Environment Effects and Electrode Reaction Dynamics for Metal Batteries using In Situ 3D Microscopy
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DOI：
10.1002/aenm.202103484
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发表时间：
2021-12-16
影响因子：
27.8
通讯作者：
Shan, Xiaonan
中科院分区：
文献类型：
--
作者：
Feng, Guangxia;Guo, Jiaming;Shan, Xiaonan
无法控制的树突生长与不均匀的反应环境密切相关。但是，缺乏了解局部电化学环境（LEE）的理解和分析方法。这里研究了LEE的影响，包括局部离子浓度，电流密度和电势，对金属电镀/剥离动力学和树突最小化。开发了一种新颖的原位3D显微镜技术，以对3D Zn-MN阳极上的Zn电镀/剥离过程的形态动力学和沉积速率进行成像。使用原位3D显微镜，直接成像反应过程中的电极形态变化，并在不同时间点获得了Zn沉积速率图。发现反应动力学与Lee和电极形态高度相关。为了进一步量化Lee效应，采用了数字双技术技术，可以准确计算电化学环境，例如局部离子浓度，电流密度和电势，这是无法直接从实验中测量的。发现3D电极表面的曲率决定了LEE并显着影响反应动力学。这提供了一种新的策略，可以通过设计和优化电极的3D几何形状来控制Lee，以最大程度地减少树突形成。
Uncontrollable dendrite growth is closely related to non-uniform reaction environments. However, there is a lack of understanding and analysis methods to probe the localized electrochemical environment (LEE). Here the effects of the LEE are investigated, including localized ion concentrations, current density, and electric potential, on metal plating/stripping dynamics and dendrite minimization. A novel in situ 3D microscopy technique is developed to image the morphology dynamics and deposition rate of Zn plating/stripping processes on 3D Zn-Mn anodes. Using the in situ 3D microscope, the electrode morphology changes during the reactions are directly imaged and Zn deposition rate maps at different time points are obtained. It is found that reaction kinetics are highly correlated to LEE and electrode morphology. To further quantify the LEE effects, the digital twin technique is employed that allows the accurate calculation of the electrochemical environments, such as localized ion concentrations, current density, and electric potential, which cannot be directly measured from experiments. It is found that the curvature of the 3D electrode surface determines the LEE and significantly influences reaction kinetics. This provides a new strategy to minimize the dendrite formation by designing and optimizing the 3D geometry of the electrode to control the LEE.