3D Operando Imaging and Quantification of Inhomogeneous Electrochemical Reactions in Composite Battery Electrodes
3D Operando Imaging and Quantification of Inhomogeneous Electrochemical Reactions in Composite Battery Electrodes
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DOI：
10.1021/acs.jpclett.0c00876
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发表时间：
2020-05-07
影响因子：
5.7
通讯作者：
Amezawa, Koji
中科院分区：
文献类型：
--
作者：
Kimura, Yuta;Tomura, Aina;Amezawa, Koji
固态电池（SSB）等电化学系统的性能会受到电极中发生的三维（3D）和介观不均匀电化学反应的严重阻碍。然而，大多数现有的方法用于分析这种非均相反应仅限于一维或二维的观察。在这里，我们进行了三维操作成像的介观不均匀的电化学反应在复合SSB电极使用硬X射线计算机断层扫描与X射线吸收近边结构光谱（CT-XANES）。首次实现了三维非均相反应过程的可视化。此外，我们的3D定量分析明确地揭示了所研究电极中不均匀反应的起源。我们的研究结果表明，通过活性材料颗粒的慢离子传输可以大大限制SSB性能。因此，我们的技术为电极中发生的电化学反应提供了新的见解，使我们能够最大限度地提高电化学系统的性能。
The performances of electrochemical systems such as solid-state batteries (SSBs) can be severely hindered by the three-dimensional (3D) and mesoscopically inhomogeneous electrochemical reactions that take place in the electrodes. However, the majority of existing methods for analyzing such inhomogeneous reactions are restricted to one- or two-dimensional observations. Herein, we performed 3D operando imaging of the mesoscopically inhomogeneous electrochemical reaction in a composite SSB electrode using hard X-ray computed-tomography with X-ray absorption near edge structure spectroscopy (CT-XANES). The 3D inhomogeneous reaction evolution during (dis)charge was successfully visualized for the first time. Furthermore, our 3D quantitative analysis unambiguously revealed the origin of the inhomogeneous reaction in the investigated electrode. Our results suggested that slow ion transport through active material particles can considerably restrict SSB performances. Our technique therefore provides new insights into the electrochemical reactions taking place in electrodes and enables us to maximize the performance of electrochemical systems.