Temperature dependence of ion pairing of a potassium salt in nonaqueous liquid and polymer electrolytes: X-ray absorption studies
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Moltech Corporation, Stony Brook, New York 11794-2275 (United States)
- Polytechnic University, Brooklyn, New York 11201 (United States)
- CFFLS, University of Kentucky, Lexington, Kentucky 40506 (United States)
Near-edge x-ray absorption fine structure spectroscopy was used to study the effect of temperature on ion pairing of a potassium salt in a modified carbonate (MC3) solution and in a poly(ethylene oxide)-potassium salt complex that used MC3 as a plasticizer. The modified carbonate was made by attaching three ethylene oxide units to the four position of ethylene carbonate. Spectra were obtained, at the [ital K] edge of potassium, over the temperature range of 25--110 [degree]C. Studies of reference systems showed a correlation between ion pairing and white line splitting in the near-edge region of the spectra. The degree of white line splitting was used as a qualitative indicator of the degree of ion pairing as a function of temperature. The results indicate that, in both systems, the number of ion pairs increases with increasing temperature.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7276400
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:4; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360606* -- Other Materials-- Physical Properties-- (1992-)
ABSORPTION SPECTRA
ALKALI METALS
CARBON COMPOUNDS
CARBONATES
DISPERSIONS
ELECTROLYTES
ELECTRONIC STRUCTURE
ELEMENTS
ION PAIRS
K SHELL
METALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POTASSIUM
SALTS
SOLUTIONS
SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
X-RAY SPECTRA