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In-situ imaging of charge carriers in an electrochemical cell [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
12 pages : digital, PDF file
Additional Creators:
Argonne National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
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 ¹⁹F and ⁷Li NMR for several cells. A sequence of ¹⁹F 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⁺ 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 B₁-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.
Report Numbers:
E 1.99:anl/cmt/cp-95511
anl/cmt/cp-95511
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
01/30/1998.
"anl/cmt/cp-95511"
4th International Conference on Magnetic Resonance Microscopy, Albuquerque, NM (US), 09/21/1998--09/25/1998.
Gerald, R. E. II.
Funding Information:
W-31109-ENG-38
View MARC record | catkey: 14100755