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 »
- 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}
}