An nmr investigation of ionic structure and mobility in plasticized solid polymer electrolytes
journal contribution
posted on 1995-10-01, 00:00authored byMaria ForsythMaria Forsyth, D MacFarlane, P Meakin, M Smith, T Bastow
23Na and 19F nuclear magnetic resonance spectroscopy is used to investigate the effect of plasticizer addition on ionic structure and mobility in a urethane crosslinked polyether solid polymer electrolyte. The incorporation of dimethyl formamide and propylene carbonate plasticizers in a sodium triflate/polyether system results in an upfield chemical shift for the 23Na resonance consistent with decreased anion-cation association and increased cation-plasticizer interactions. The 19F resonances appears less susceptible to changes in chemical environment with only minor chemical shift changes recorded. Spin lattice relaxation measurements for the 19F nucleus are also reported. Two minima are observed in the relaxation measurements consistent with both an inter and intramolecular relaxation mechanism.