Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102374
Title: Electrochemical strain microscopy time spectroscopy: Model and experiment on LiMn2O4
Authors: Amanieu, H. -Y.
Thai, H. N. M.
Luchkin, S. Yu.
Rosato, D.
Lupascu, D. C.
Keip, M. -A.
Schröder, J.
Kholkin, A. L.
Issue Date: 2015
Publisher: American Institute of Physics Inc.
Citation: Electrochemical strain microscopy time spectroscopy: Model and experiment on LiMn2O4 / H. -Y. Amanieu, H. N. M. Thai, S. Yu. Luchkin, et al. — DOI 10.1063/1.4927747 // Journal of Applied Physics. — 2015. — Vol. 118. — Iss. 5. — 055101.
Abstract: Electrochemical Strain Microscopy (ESM) can provide useful information on ionic diffusion in solids at the local scale. In this work, a finite element model of ESM measurements was developed and applied to commercial lithium manganese (III,IV) oxide (LiMn2O4) particles. ESM time spectroscopy was used, where a direct current (DC) voltage pulse locally disturbs the spatial distribution of mobile ions. After the pulse is off, the ions return to equilibrium at a rate which depends on the Li diffusivity in the material. At each stage, Li diffusivity is monitored by measuring the ESM response to a small alternative current (AC) voltage simultaneously applied to the tip. The model separates two different mechanisms, one linked to the response to DC bias and another one related to the AC excitation. It is argued that the second one is not diffusion-driven but is rather a contribution of the sum of several mechanisms with at least one depending on the lithium ion concentration explaining the relaxation process. With proper fitting of this decay, diffusion coefficients of lithium hosts could be extracted. Additionally, the effect of phase transition in LiMn2O4 is taken into account, explaining some experimental observations. © 2015 AIP Publishing LLC.
Keywords: DIFFUSION IN SOLIDS
IONS
LITHIUM COMPOUNDS
MANGANESE COMPOUNDS
SPECTROMETERS
AC EXCITATION
ALTERNATIVE CURRENT
DIFFERENT MECHANISMS
DIFFUSION DRIVEN
DIRECT CURRENT VOLTAGE
ELECTROCHEMICAL STRAIN MICROSCOPIES
LI DIFFUSIVITY
TIME SPECTROSCOPY
LITHIUM
URI: http://hdl.handle.net/10995/102374
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84938800735
PURE ID: 322268
a85369aa-50cd-4588-8b77-24053ec70240
ISSN: 218979
DOI: 10.1063/1.4927747
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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