Silicon clathrates have attracted interest as potential anodes for lithium‐ion batteries with unique framework structures. However, very little is known about the surface reactivity and solid electrolyte interphase (SEI) properties of clathrates. In this study, operando scanning electrochemical microscopy (SECM) is used to investigate the effect of pre‐treatment on the formation dynamics and intrinsic properties of the SEI in electrodes prepared from type I Ba₈Al₁₆Si₃₀ silicon clathrates. Although X‐ray photoelectron spectroscopy (XPS) analysis does not reveal large changes in SEI composition, it is found through SECM measurements that ball‐milling combined with chemical acid/base etching of the clathrates lead to a more stable and rapidly formed SEI as compared to purely ball‐milled samples, resulting in enhanced coulombic efficiency.

中文翻译：

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使用扫描电化学显微镜阐明的电池材料的表面特性：I型笼形硅酸盐的情况

笼形硅酸盐作为具有独特框架结构的锂离子电池的潜在阳极引起了人们的兴趣。但是，关于包合物的表面反应性和固体电解质相间（SEI）性质知之甚少。在这项研究中，使用操作扫描电化学显微镜（SECM）来研究预处理对由I Ba ₈ Al ₁₆ Si ₃₀型制备的电极中SEI的形成动力学和内在性质的影响。硅包合物。尽管X射线光电子能谱（XPS）分析并未显示出SEI组成发生大的变化，但通过SECM测量发现，球磨结合包合物的化学酸/碱蚀刻可以使SEI更加稳定和快速形成到纯球磨样品，从而提高了库仑效率。