软X射线光谱法研究LiMn1.5Ni0.5O4充电过程中的电子转移

IF 1.8 4区工程技术

Microscopy Pub Date : 2021-10-01 DOI:10.1093/jmicro/dfab014

Ryosuke Okamoto;Masami Terauchi

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引用次数: 0

摘要

这是首次使用波长色散光谱仪分析锂离子电池电极在不同充电状态下的化学状态的报告，与传统的能量色散X射线分析仪相比，波长色散光谱仪在软X射线能量区的能量分辨率提高了两级。将含有LiMn1.5Ni0.5O4的电极充电以制备Li0.5Mn1.5Ni0.5 O4和λ-Mn0.75Ni0.25O2。从这些材料获得的软X射线发射光谱表明，在整个充电过程中，O-K发射信号急剧降低。这表明O-2p电子对电化学氧化有贡献。从从头计算得到的态密度和Bader电荷支持了这一结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Electron transfer in LiMn1.5Ni0.5O4 during charging studied with soft X-ray spectrometry

This is the first report on analyzing the chemical state of Li-ion battery electrodes at different states of charge by using a wavelength-dispersive spectrometer, which has a two-order improved energy resolution in the soft X-ray energy region compared with that of a conventional energy-dispersive X-ray analyzer. Electrodes containing LiMn 1.5 Ni 0.5 O 4 were charged to prepare Li 0.5 Mn 1.5 Ni 0.5 O 4 and λ-Mn 0.75 Ni 0.25 O 2 . The soft X-ray emission spectra obtained from those materials show that the O-K emission signal was drastically decreased throughout the charging process. This suggests that O-2p electron contributed to the electrochemical oxidation. The density of states and Bader charge evaluated from ab initio calculation support this result.

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来源期刊

Microscopy 工程技术-显微镜技术

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： Microscopy, previously Journal of Electron Microscopy, promotes research combined with any type of microscopy techniques, applied in life and material sciences. Microscopy is the official journal of the Japanese Society of Microscopy.