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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Local Structure and Stability of SEI in Graphite and ZFO Electrodes Probed by As K-Edge Absorption Spectroscopy
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Local Structure and Stability of SEI in Graphite and ZFO Electrodes Probed by As K-Edge Absorption Spectroscopy

机译：As K边缘吸收光谱法探测石墨和ZFO电极中SEI的局部结构和稳定性

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摘要

The evolution of the solid electrolyte interphase (SEI) during the first Li uptake in. advanced Li-ion electrodes is studied by X-ray absorption spectroscopy (XAS). The As atoms present in the electrolyte solution were used as a local probe for monitoring the SEI growth on different electrodes. High-quality As Kedge spectra were collected in fluorescence mode for a set of graphite and carbon-coated ZnFe2O4 electrodes. XAS measurements have been preceded and corroborated by electrochemical characterizations. SEI phase evolution was analyzed by distinct As valence states in the subsequent stages of SEI formation, while X-ray fluorescence (XRF) was used to estimate the As content. Detailed structural results are presented for different Li contents in different electrodes including the estimated thickness of the SEI layer, contribution of different As oxidation states, and As local structure. The formation of AsFN complexes with different local coordination N is clearly observed and measured at various SEI evolution stages. Evidence of a partially reversed redox process, taking place within the SEI by charge-discharge cycling, was also obtained.
机译：通过X射线吸收光谱（XAS）研究了高级锂离子电极首次吸收锂期间固体电解质中间相（SEI）的演变。电解质溶液中存在的As原子用作局部探针，用于监测SEI在不同电极上的生长。以荧光模式收集了一组石墨和碳包覆的ZnFe2O4电极的高质量As Kedge光谱。 XAS测量先于电化学表征，并得到证实。在SEI形成的后续阶段中，通过不同的As价态分析了SEI相的演变，而X射线荧光（XRF）用于估算As含量。给出了针对不同电极中不同Li含量的详细结构结果，包括SEI层的估计厚度，不同As氧化态的贡献以及As局部结构。在不同的SEI演化阶段，可以清楚地观察到并测量到具有不同局部配位N的AsFN复合物的形成。还获得了在SEI中通过充放电循环发生部分逆转的氧化还原过程的证据。

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