期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 34, 页码 22235-22242出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp01999k
关键词
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资金
- Ministry of Education (Singapore) through the National University of Singapore under Academic Research Fund [R-265-000-406-112]
- Ministry of Education (Singapore) under the Academic Research Fund [R-265-100-406-112]
This paper presents in situ characterization of lithium-ion diffusion at nano-to micro-meter scales in a Li-rich layered oxide thin film cathode under external bias by using Electrochemical Strain Microscopy (ESM) and Atomic Force Microscopy (AFM) techniques. The local variations of the diffusion coefficient are calculated and visualized from the ESM images. The results indicate that the Li-ion movement is closely correlated with the changes in the surface topography when the Li-rich cathode is subjected to an external bias. Furthermore, bias-induced Li-ion redistribution is partially reversible. Topography evolution due to Li-ion diffusion and relaxation behaviour are observed. The results from this in situ study provide the insight into the Li-ion diffusion mechanism in the cathode material and pave the way for studying the details of the diffusion-related phenomenon in Li-ion battery materials.
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