High pressure NMR and electrical conductivity studies of gel electrolytes based on poly(acrylonitrile)

• Published in: Solid state ionics Vol. 85; no. 1; pp. 173 - 179
• Main Authors: Edmondson, Charles A., Wintersgill, Mary G., Fontanella, John J., Gerace, Furio, Scrosati, Bruno, Greenbaum, Steven G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 1996; Elsevier Science
• Subjects: Applied sciences; Complex impedance; Electrical conductivity; Electrical, magnetic and optical properties; Exact sciences and technology; Gels; High pressure; Nuclear magnetic resonance; Organic polymers; Physicochemistry of polymers; Properties and characterization; Complex impedance; Electrical conductivity; Nuclear magnetic resonance; Gels; High pressure; Electrical properties; Organic carbonate; Ionic conductivity; Polymer solid electrolyte; Composition effect; Experimental study; Molecular relaxation; Complexes; Intermolecular interaction; Alkali metal Perchlorates; Pressure effect; Acrylonitrile polymer
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/0167-2738(96)00055-0

The effect of high pressure on electrical conductivity and NMR in gels prepared from lithium or sodium perchlorate, ethylene carbonate, dimethyl carbonate and poly(acrylonitrile) (PAN) has been determined. The corresponding liquids were also studied. Complex impedance studies at frequencies from 10 to 10 8 Hz and NMR measurements of T 1 were carried out as a function of pressure up to 0.25 GPa. Activation volumes for NMR relaxation and ionic conductivity were calculated from the variable pressure data. Both activation volumes were found to be approximately the same in the liquids. For the gels, however, the NMR activation volumes are the same or lower than for the liquid while the electrical conductivity pressure dependences are larger. The implications of these results are discussed in terms of possible effects of the PAN on the ionic solvation shell.