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This content will become publicly available on March 15, 2017

Title: Characterization of LiMn2O4 cathodes by electrochemical strain microscopy

Electrochemical strain microscopy (ESM) is a scanning probe microscopy(SPM) method in which the local electrodiffusion is probed via application of AC voltage to the SPM tip and registration of resulting electrochemical strain. In this study, we implemented ESM to measure local strain in bulk LiMn2O4 cathodes of a commercial Li-battery in different states of charge to investigate distribution of Li-ion mobility and concentration. Ramped AC ESM imaging and voltage spectroscopy were used to find the most reliable regime of measurements allowing separating and diminishing different contributions to ESM. This is not a trivial task due to complex geometry of the sample and various obstacles resulting in less predictable contributions of different origins into ESM response: electrostatic tip–surface interactions, charge injection, electrostriction, and flexoelectricity. Finally, understanding and control of these contributions is an important step towards quantitative interpretation of ESM data.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [2] ;  [4]
  1. Ural Federal Univ., Ekaterinburg (Russia). Inst. of Natural Sciences
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Inst. for Functional Imaging of Materials
  3. Univ. of Aveiro (Portugal). Physics Dept. and CICECO-Aveiro Inst. of Materials
  4. Ural Federal Univ., Ekaterinburg (Russia). Inst. of Natural Sciences; Univ. of Aveiro (Portugal). Physics Dept. and CICECO-Aveiro Inst. of Materials
Publication Date:
OSTI Identifier:
1261313
Grant/Contract Number:
AC05-00OR22725; 290158; 1366.2014/236
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 11; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC); European Commission (EC), Brussels (Belgium); Government of the Russian Federation, Moscow (Russia). Ministry of Education and Science
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY