Special Issue: Challenges for Lithium Detection
In this issue
Annular bright field imaging enables us to visualize individual lithium atomic columns simultaneously with heavy elements. In ABF image, the number of lithium ions at the column was countable when the specimen is thin. Also, movement of lithium ions in the material could be observed by in-situ ABF observation.
We overviewed ABF imaging theory and its application in Li ion detection. According to the Li ion diffusion mechanism, the electrode materials are divided into three categories: 1D, 2D and 3D transport. ABF imaging has proven to be an analytical characterization tool for Li ions in rechargeable batteries.
Operando observations of solid-state electrochemical reactions in Li-ion batteries by spatially resolved TEM EELS and electron holography
Operand spatially-resolved TEM EELS and electron holography revealed how Li-ions and local electric potential changed around electrode/solid-electrolyte interfaces during battery reaction. Crystal structure and electronic structure changes due to Li insertion reaction were also observed. These observation techniques and results are described in this paper.
Cover Image: Cover photographs show annular bright field (ABF) images of LiFePO4 crystal at the initial stage (upper part) and of FePO4 crystal after fully charging (lower part). They were obtained by viewing from the  direction. Lithium (Li) ions are indicated by green circle, iron (Fe), by red, phosphorus (P), by yellow and oxygen (O), by grey. Li ions were observed to remove by charging at an atomic scale by ABF imaging. Microscopy 66: 25-38.
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