Study of Electron Transfer of LiMn1.5Ni0.5O4 during Charging using Soft X-ray Spectrometer Installed in Scanning Electron Microscope
Study of Electron Transfer of LiMn1.5Ni0.5O4 during Charging using Soft X-ray Spectrometer Installed in Scanning Electron Microscope
复制标题
扫描电镜软X射线能谱仪研究LiMn1.5Ni0.5O4充电过程中的电子转移
DOI：
10.1093/jmicro/dfab014
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发表时间：
2021
期刊：
影响因子：
1.8
通讯作者：
R.Okamoto and M.Terauchi
中科院分区：
文献类型：
--
作者：
今泉 修;浅井智久;高橋英彦;今水 寛;Y. Nakata;R.Okamoto and M.Terauchi
这是第一个报告，分析锂离子电池电极在不同的充电状态下，通过使用波长色散光谱仪，它具有两个顺序的提高在软X射线能量区的能量分辨率相比，传统的能量色散X射线分析仪。对含有LiMn1.5Ni0.5O4的电极进行充电，制备了Li0.5Mn1.5Ni0.5O4和λ-Mn0.75Ni0.25O2。从这些材料获得的软X射线发射光谱表明，O-K发射信号在整个充电过程中急剧下降。这表明O-2 p电子对电化学氧化有贡献。由量子化学从头计算得到的态密度和Bader电荷支持了这一结果。
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 LiMn1.5Ni0.5O4were charged to prepare Li0.5Mn1.5Ni0.5O4and λ-Mn0.75Ni0.25O2. 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 fromab initiocalculation support this result.