Quantitative characterization of the ionic mobility and concentration in Li-battery cathodes via low frequency electrochemical strain microscopy
authors Alikin, DO; Romanyuk, KN; Slautin, BN; Rosato, D; Shur, VY; Kholkin, AL
nationality International
journal NANOSCALE
keywords FORCE MICROSCOPY; NANOSCALE; SPECTROSCOPY; SOLIDS; INTERFACE; INJECTION; MECHANISM; DIFFUSION; TRANSPORT; ELECTRODE
abstract Electrochemical strain microscopy (ESM) can provide useful information on the ionic processes in materials at the local scale. This is especially important for ever growing applications of Li-batteries whose performance is limited by the intrinsic and extrinsic degradation. However, the ESM method used so far has been only qualitative due to multiple contributions to the apparent ESM signal. In this work, we provide a viable approach for the local probing of ionic concentration and diffusion coefficients based on the frequency dependence of the ESM signal. A theoretical basis considering the dynamic behavior of ion migration and relaxation and change of ion concentration profiles under the action of the electric field of the ESM tip is developed. We argue that several parasitic contributions to the ESM signal discussed in the literature can be thus eliminated. The analysis of ESM images using the proposed approach allows a quantitative mapping of the ionic diffusion coefficients and concentration in ionic conductors. The results are validated on Li-battery cathodes (LiMn2O4) extracted from commercial Li-batteries and can provide novel possibilities for their development and further insight into the mechanisms of their degradation.
publisher ROYAL SOC CHEMISTRY
issn 2040-3364
year published 2018
volume 10
issue 5
beginning page 2503
ending page 2511
digital object identifier (doi) 10.1039/c7nr08001h
web of science category Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
subject category Chemistry; Science & Technology - Other Topics; Materials Science; Physics
unique article identifier WOS:000424075400039
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journal impact factor 7.233
5 year journal impact factor 7.713
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