Abstract
In situ measurements of the ionic conductivity were performed on polyethers, poly(ethylene oxide) (PEO) and poly(oligo oxyethylene methacrylate) (PMEO), with lithium triflate (LiCF 3SO 3) as crystalline and amorphous electrolytes, and at CO 2 pressures up to 20 MPa. Both PEO and PMEO systems in subcritical and supercritical CO 2 increased more than five fold in ionic conductivity at 40 °C composed to atmospheric pressure. The pressure dependence of the ionic conductivity for PEO electrolytes was positive under CO 2, and increased by two orders of magnitude under pressurization from 0 to 20 MPa, whereas it decreases with increasing pressure of N 2. The enhancement is caused by the plasticizing effect of CO 2 molecules that penetrate into the electrolytes.
Published Version
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