X-ray absorption studies 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 the following systems: a potassium salt in (1) a propylene carbonate (PC) solution, (2) a modified carbonate (MC3) solution and (3) in a poly(ethylene oxide) (PEO)-potassium salt complexes having either PC or MC3 as a plasticizer. MC3 is similar to PC except that, instead of a methyl group, there are three ethylene oxide units attached to the 4-position. 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 an ion pair dissociation of MC3 is superior to PC. This is in good agreement with temperature conductivity study.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 43056
- Report Number(s):
- CONF-931024--; ISBN 1-56677-033-5
- Country of Publication:
- United States
- Language:
- English
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