Lei Xu, Ye Xiao, Zhi-Xian Yu, Yi Yang, Chong Yan, Jia-Qi Huang
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引用次数: 0
摘要
电化学阻抗光谱(EIS)具有非破坏性和原位性的特点,在理解锂离子电池的热力学和动力学过程方面发挥着至关重要的作用。然而,目前对多孔电极的 EIS 还缺乏一致和连贯的物理解释。因此,对 EIS 的基本物理机制进行深入研究势在必行。在此,我们利用电池中的参比电极,重新审视了不同频率下 EIS 的相关物理解释。结合不同的电池配置、温度依赖性实验和弛豫时间分布分析,我们发现多孔电极通道中的离子传输和伪电容行为分别主导了高频和中频阻抗弧。这项工作为 EIS 的物理解释提供了一个视角,也为理解其他先进储能系统的 EIS 特性提供了启示。
Revisiting the Electrochemical Impedance Spectroscopy of Porous Electrodes in Li-ion Batteries by Employing Reference Electrode.
Electrochemical impedance spectroscopy (EIS), characterized by its non-destructive and in situ nature, plays a crucial role in comprehending the thermodynamic and kinetic processes occurring within Li-ion batteries. However, there is a lack of consistent and coherent physical interpretations for the EIS of porous electrodes. Therefore, it is imperative to conduct thorough investigations into the underlying physical mechanisms of EIS. Herein, by employing reference electrode in batteries, we revisit the associated physical interpretation of EIS at different frequencies. Combining different battery configurations, temperature-dependent experiments, and elaborated distribution of relaxation time analysis, we find that the ion transport in porous electrode channels and pseudo-capacitance behavior dominate the high-frequency and mid-frequency impedance arcs, respectively. This work offers a perspective for the physical interpretation of EIS and also sheds light on the understanding of EIS characteristics in other advanced energy storage systems.
期刊介绍:
Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.