Interfacial Stability of Lithium in Non-Aqueous Gel Polymer Electrolyte Cells
Technical rept. 1 Jan 1989-1 May 1990
MINNESOTA UNIV MINNEAPOLIS CORROSION RESEARCH CENTER
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Solid polymer electrolytes SPE prepared by crosslinking non-aqueous gel polymer precursors in dimethyl sulfoxide-lithium salt media were investigated by a.c. conductivity measurements. These materials exhibit an ionic conductivity of about 10-3 Scm at 25 deg C. Electrochemical cells of the type LiSPELi and LiSPEM where M Ni, Al SS were fabricated. Cyclic voltammograms on the asymmetric cells indicate that the electrolyte decomposition potential is about 3.6 volts. The shape of the repetitive cyclic voltammograms within the stability domain indicated that the lithium plating stripping process is more efficient in the case of LiSPENi LiSPEAl than LiSPESS asymmetric cells. The a.c. impedance measurements on symmetric LiSPE Li cells exhibited two well define semi-circles with three intercepts on three real-axis. The observed increase in impedance with time was indicative of passivating film formation at the interface. The growth of the film stabilized at a finite value, permitting lithium cyclability. Keywords Polymer electrolyte, Solid state battery, Electric batteries, Interfacial impedance.
- Electrochemical Energy Storage