Kobayashi Shunsuke, Fisher Craig A J, Kuwabara Akihide, Ukyo Yoshio, Ikuhara Yuichi
Nanostructures Research Laboratory, Japan Fine Ceramics Center, Atsuta, Nagoya 456-8587, Japan.
Office of Society-Academia Collaboration for Innovation, Kyoto University, Uji, Kyoto 611-0011, Japan.
Microscopy (Oxf). 2017 Aug 1;66(4):254-260. doi: 10.1093/jmicro/dfx012.
The spatial distribution of Li ions in a lithium iron phosphate (Li1-xFePO4) single crystal after chemical delithiation is quantitatively investigated using Fe M2,3-edge and valence electron energy loss (EEL) spectroscopy techniques. Li contents between those of end-member compositions LiFePO4 and FePO4 are found to correspond to reproducible changes in Fe M2,3-edge and valence EEL spectra across an interface between LiFePO4 and FePO4 regions. Quantitative analysis of these changes is used to estimate the local valence states of Fe ions, from which the Li concentration in the intermediate phase can be deduced. The faster recording time for valence EEL spectra than Fe M2,3-edge spectra makes measurement of the former a more efficient and reproducible means of estimating Li distributions.
利用Fe M2,3边和价电子能量损失（EEL）光谱技术，对化学脱锂后的磷酸铁锂（Li1-xFePO4）单晶中锂离子的空间分布进行了定量研究。发现端元成分LiFePO4和FePO4之间的锂含量对应于LiFePO4和FePO4区域之间界面上Fe M2,3边和价EEL光谱的可重复变化。对这些变化进行定量分析，以估计Fe离子的局部价态，由此可以推断中间相中的锂浓度。价EEL光谱的记录时间比Fe M2,3边光谱更快，这使得测量前者成为估计锂分布的更有效和可重复的方法。
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