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Real space mapping of ionic diffusion and electrochemical activity in energy storage and conversion materials

Patent ·
OSTI ID:1130453
; ; ; ;
A method and system for probing mobile ion diffusivity and electrochemical reactivity on a nanometer length scale of a free electrochemically active surface includes a control module that biases the surface of the material. An electrical excitation signal is applied to the material and induces the movement of mobile ions. An SPM probe in contact with the surface of the material detects the displacement of mobile ions at the surface of the material. A detector measures an electromechanical strain response at the surface of the material based on the movement and reactions of the mobile ions. The use of an SPM tip to detect local deformations allows highly reproducible measurements in an ambient environment without visible changes in surface structure. The measurements illustrate effective spatial resolution comparable with defect spacing and well below characteristic grain sizes of the material.
Research Organization:
ORNL (Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States))
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
Patent Number(s):
8,719,961
Application Number:
13/291,480
OSTI ID:
1130453
Country of Publication:
United States
Language:
English

References (8)

Local probing of ionic diffusion by electrochemical strain microscopy: Spatial resolution and signal formation mechanisms journal September 2010
An efficient, simple, and precise way to map strain with nanometer resolution in semiconductor devices journal March 2010
Nanoscale mapping of ion diffusion in a lithium-ion battery cathode journal August 2010
In Situ Observation of Strains during Lithiation of a Graphite Electrode journal January 2010
Structural evolution of the MoO3(010) surface during lithium intercalation journal June 2003
Local bias-induced phase transitions journal November 2008
Real Space Mapping of Li-Ion Transport in Amorphous Si Anodes with Nanometer Resolution journal September 2010
Electromechanical probing of ionic currents in energy storage materials journal May 2010

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