X-ray absorption of the effect of plasticizers on ion-pair dissociation in a poly(ethylene oxide)-potassium salt complex
- Brookhaven National Lab., Upton, NY (United States)
- Moltech Corp., Stony Brook, NY (United States)
- Polytechnic Univ., Brooklyn, NY (United States)
- Univ. of Kentucky, Lexington, KY (United States)
Polyethylene oxide (PEO)-salt systems are an important new class of electrolytes that are being considered for use in high specific energy rechargeable lithium batteries. Near-edge X-ray absorption fine structure (NEXAFS) spectra, at the potassium K edge, were obtained for a potassium salt in the following systems: (1) a propylene carbonate (PC) solution, (2) a modified carbonate (MC3) solution, and (3) poly(ethylene oxide) (PEO)-potassium salt complexes with either PC or MC3 as a plasticizer. MC3 is a new plasticizer developed in the authors' laboratory which is similar to PC except that, instead of a methyl group, there are three ethylene oxide units attached to the 4-position. By examining the NEXAFS of various potassium salt reference systems, it was found that the white line splitting in the near-edge region was correlated with ion-pairing. The degree of white line splitting was used to study ion-pair dissociation effects of PC and MC3 qualitatively. When used as a solvent, MC3 has a stronger ion-pair dissociation effect compared to PC. When used as a plasticizer in a PEO-potassium salt complex, the enhancement effect on ion-pair dissociation of MC3 is superior to PC. These results were corroborated by Raman spectroscopy which showed that MC3 has a stronger ion-pair dissociation effect than PC.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6558987
- Journal Information:
- Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 142:1; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360606 -- Other Materials-- Physical Properties-- (1992-)
ABSORPTION SPECTROSCOPY
ALCOHOLS
ALKALI METAL COMPOUNDS
ELECTRIC BATTERIES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTROLYTES
GLYCOLS
HYDROXY COMPOUNDS
IONIC CONDUCTIVITY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
POLYETHYLENE GLYCOLS
POLYMERS
POTASSIUM COMPOUNDS
SPECTROSCOPY
X-RAY SPECTROSCOPY