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首页> 外文期刊>Journal of power sources >Changes in electronic structure of the electrochemically Li-ion deintercalated LiNiO_2 system investigated by soft X-ray absorption spectroscopy
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Changes in electronic structure of the electrochemically Li-ion deintercalated LiNiO_2 system investigated by soft X-ray absorption spectroscopy

机译：软X射线吸收光谱法研究电化学锂离子嵌入LiNiO_2系统的电子结构变化。

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摘要

The electronic structures of Li_(1-x)NiO_2 system after electrochemically deintercalated to various "x" values have been investigated using soft X-ray absorption spectroscopy (XAS) for oxygen K-edge and Ni L_(Ⅱ, Ⅲ)-edge. By comparing the O K-edge XAS spectra of Li_(1-x)NiO_2 electrode collected simultaneously by the partial electron yield (PEY) mode and florescence mode (FY), it was found that the surface electronic structure of Li_(1-x)NiO_2 electrode is different from the bulk. Therefore, if the PEY mode, which is a surface-sensitive technique, is used alone, the reliability of the results is limited to the surface structures only. Ni L_(Ⅱ, Ⅲ)-edge XAS results of Li_(1-x)NiO_2 electrode at different charge states, in both the FY and PEY modes, show that Ni~(2+) ions at the surface are mostly oxidized to Ni~(3+) ions during Li deintercalation, whereas the process in the bulk is the oxidation of Ni ions from Ni~(3+) to Ni~(4+).
机译：利用软X射线吸收光谱法（XAS）研究了氧K-边缘和Ni L_（Ⅱ，Ⅲ）-边缘对Li_（1-x）NiO_2体系电化学脱嵌成各种“ x”值后的电子结构。通过比较Li_（1-x）NiO_2电极通过部分电子产率（PEY）模式和荧光模式（FY）同时采集的O K-edge XAS光谱，发现Li_（1-x）的表面电子结构）NiO_2电极与整体电极不同。因此，如果单独使用作为表面敏感技术的PEY模式，则结果的可靠性仅限于表面结构。 Li_（1-x）NiO_2电极在FY和PEY模式下在不同电荷状态下的Ni L_（Ⅱ，Ⅲ）-边缘XAS结果表明，表面的Ni〜（2+）离子大部分被氧化为Ni Li脱嵌过程中有〜（3+）离子，而整体过程是Ni离子从Ni〜（3+）氧化为Ni〜（4+）。

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