July 2011

Journal

Direct mapping of ion diffusion times on LiCoO2 surfaces with nanometer resolution

By:
Guo, Senli ; Jesse, Stephen ; Kalnaus, Sergiy ; Wisinger, Nina ; Daniel, Claus ; Kalinin, Sergei V
Journal Name:
Journal of the Electrochemical Society
Page Number:
A982-A990
Volume:
158
Issue Number:
8
Publication Date:
July 2011
View DOI Listing:
https://doi.org/10.1149/1.3604759

Abstract

The strong coupling between the molar volume and mobile ion concentration in ionically-conductive solids is used for spatially-resolved studies of ionic transport on the polycrystalline LiCoO2 surface by time-resolved spectroscopy. Strong variability between ionic transport at the grain boundaries and within the grains is observed, and the relationship between relaxation and hysteresis loop formation is established. The use of the strain measurements allows ionic transport be probed on the nanoscale, and suggests enormous potential for probing ionic materials and devices.