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Title: In-situ imaging of charge carriers in an electrochemical cell.

Abstract

A toroid cavity nuclear magnetic resonance (NMR) detector capable of quantitatively recording radial concentration profiles, diffusion constants, displacements of charge carriers, and radial profiles of spin-lattice relaxation time constants was employed to investigate the charge/discharge cycle of a solid-state electrochemical cell. One-dimensional radial concentration profiles (1D-images) of ions solvated in a polyethylene oxide matrix were recorded by {sup 19}F and {sup 7}Li NMR for several cells. A sequence of {sup 19}F NMR images, recorded at different stages of cell polarization, revealed the evolution of a region of the polymer depleted of charge carriers. From these images it is possible to extract the transference number for the Li{sup +} ion. Spatially localized diffusion coefficients and spin-lattice relaxation time constants can be measured simultaneously for the ions in the polymer electrolyte by a spin-labeling method that employs the radial B{sub 1}-field gradient of the toroid cavity. A spatial resolution of 7 {micro}m near the working electrode was achieved with a gradient strength of 800 gauss/cm. With this apparatus, it is also possible to investigate novel intercalation anode materials for lithium ion storage. These materials are coated onto the working electrode in a thin film. The penetration depth of lithium cations in thesemore » films can be imaged at different times in the charge/discharge cycle of the battery.« less

Authors:
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
10617
Report Number(s):
ANL/CMT/CP-95511
TRN: AH200126%%351
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 4th International Conference on Magnetic Resonance Microscopy, Albuquerque, NM (US), 09/21/1998--09/25/1998; Other Information: PBD: 30 Jan 1998
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; CHARGE CARRIERS; ELECTROCHEMICAL CELLS; LITHIUM IONS; NUCLEAR MAGNETIC RESONANCE; POLYETHYLENE GLYCOLS; SPATIAL RESOLUTION; SPIN-LATTICE RELAXATION; THIN FILMS; BATTERY CHARGING; VOLTAGE DROP

Citation Formats

Gerald, II, R E. In-situ imaging of charge carriers in an electrochemical cell.. United States: N. p., 1998. Web.
Gerald, II, R E. In-situ imaging of charge carriers in an electrochemical cell.. United States.
Gerald, II, R E. 1998. "In-situ imaging of charge carriers in an electrochemical cell.". United States. https://www.osti.gov/servlets/purl/10617.
@article{osti_10617,
title = {In-situ imaging of charge carriers in an electrochemical cell.},
author = {Gerald, II, R E},
abstractNote = {A toroid cavity nuclear magnetic resonance (NMR) detector capable of quantitatively recording radial concentration profiles, diffusion constants, displacements of charge carriers, and radial profiles of spin-lattice relaxation time constants was employed to investigate the charge/discharge cycle of a solid-state electrochemical cell. One-dimensional radial concentration profiles (1D-images) of ions solvated in a polyethylene oxide matrix were recorded by {sup 19}F and {sup 7}Li NMR for several cells. A sequence of {sup 19}F NMR images, recorded at different stages of cell polarization, revealed the evolution of a region of the polymer depleted of charge carriers. From these images it is possible to extract the transference number for the Li{sup +} ion. Spatially localized diffusion coefficients and spin-lattice relaxation time constants can be measured simultaneously for the ions in the polymer electrolyte by a spin-labeling method that employs the radial B{sub 1}-field gradient of the toroid cavity. A spatial resolution of 7 {micro}m near the working electrode was achieved with a gradient strength of 800 gauss/cm. With this apparatus, it is also possible to investigate novel intercalation anode materials for lithium ion storage. These materials are coated onto the working electrode in a thin film. The penetration depth of lithium cations in these films can be imaged at different times in the charge/discharge cycle of the battery.},
doi = {},
url = {https://www.osti.gov/biblio/10617}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 30 00:00:00 EST 1998},
month = {Fri Jan 30 00:00:00 EST 1998}
}

Conference:
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