Lithium-7 NMR and ionic conductivity studies of gel electrolytes based on poly(acrylonitrile)

TLDR: The ionic conductivity of composite gel electrolytes prepared from mixtures of poly(acrylonitrile) (PAN), ethylene carbonate (EC), propylene carbonates (PC), and LiClO[sub 4] or LiAsF[sub 6] have been investigated by complex impedance, differential scanning calorimetry (DSC), and [sup 7]Li nuclear magnetic resonance (NMR) spectroscopy as mentioned in this paper.

Abstract: Composite gel electrolytes prepared from mixtures of poly(acrylonitrile) (PAN), ethylene carbonate (EC), propylene carbonate (PC), and LiClO[sub 4] or LiAsF[sub 6] have been investigated by complex impedance, differential scanning calorimetry (DSC), and [sup 7]Li nuclear magnetic resonance (NMR) spectroscopy The ionic conductivity of a gel containing LiAsF[sub 6] reaches 10[sup [minus]2] S/cm at 60[degrees]C Although the conductivity of the gels approach that found in EC/PC liquid electrolytes, NMR line width, and spin-lattice relaxation time (T[sub 1]) measurements indicate that even short-range ionic mobility is impeded by the presence of the PAN As in the case of amorphous polyether-salt polymer electrolytes, the onset of [sup 7]Li motional line narrowing in the gels is strongly correlated with the DSC-determined glass transition temperature 6 figs, 1 tab