Surface Properties of Battery Materials Elucidated Using Scanning Electrochemical Microscopy: The Case of Type I Silicon Clathrate
Surface Properties of Battery Materials Elucidated Using Scanning Electrochemical Microscopy: The Case of Type I Silicon Clathrate
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使用扫描电化学显微镜阐明电池材料的表面特性：以 I 型硅包合物为例
DOI：
10.1002/celc.201901688
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发表时间：
2019
期刊：
影响因子：
4
通讯作者：
Ventosa, Edgar
中科院分区：
文献类型：
--
作者：
Tarnev, Tsvetan;Wilde, Patrick;Dopilka, Andrew;Schuhmann, Wolfgang;Chan, Candace K.;Ventosa, Edgar
硅包合物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。然而，人们对包合物的表面反应性和固体电解质界面（SEI）特性知之甚少。本研究采用操作扫描电化学显微镜（SECM）研究了预处理对由 I型Ba8Al16Si30硅包合物制备的电极中SEI的形成动力学和固有性质的影响。尽管X射线光电子能谱（XPS）分析并未揭示SEI成分的大变化，但通过SECM测量发现，与纯球磨样品相比，球磨结合包合物的化学酸/碱蚀刻可导致更稳定且快速形成的SEI，从而提高库仑效率。
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,operandoscanning 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 Ba8Al16Si30silicon 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.
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