Jump to main content
Jump to site search

Issue 5, 2018
Previous Article Next Article

Quantitative characterization of the ionic mobility and concentration in Li-battery cathodes via low frequency electrochemical strain microscopy

Author affiliations

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.

Graphical abstract: Quantitative characterization of the ionic mobility and concentration in Li-battery cathodes via low frequency electrochemical strain microscopy

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Oct 2017, accepted on 15 Dec 2017 and first published on 15 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR08001H
Citation: Nanoscale, 2018,10, 2503-2511
  •   Request permissions

    Quantitative characterization of the ionic mobility and concentration in Li-battery cathodes via low frequency electrochemical strain microscopy

    D. O. Alikin, K. N. Romanyuk, B. N. Slautin, D. Rosato, V. Ya. Shur and A. L. Kholkin, Nanoscale, 2018, 10, 2503
    DOI: 10.1039/C7NR08001H

Search articles by author

Spotlight

Advertisements