W. Wieczorek et Jr. Stevens, IMPEDANCE SPECTROSCOPY AND PHASE-STRUCTURE OF POLYETHER-POLY(METHYLMETHACRYLATE)-LICF3SO3 BLEND-BASED ELECTROLYTES, JOURNAL OF PHYSICAL CHEMISTRY B, 101(9), 1997, pp. 1529-1534
Polymeric electrolytes obtained by the free radical polymerization of
methyl methacrylate in a solution of LiCF3SO3 in an ethylene oxide-pro
pylene oxide copolymer are studied. These electrolytes exhibit ambient
temperature conductivities up to 3 x 10(-5) S/cm. Impedance spectrosc
opy experiments performed in a symmetrical cell with two lithium elect
rodes show that the properties of lithium electrode-polymer electrolyt
e interface are improved after the in situ polymerization of methyl me
thacrylate in the electrolyte. The growth of the resistance of the pas
sive layer formed on the electrode-electrolyte interface is suppressed
. The impedance studies are coupled with FT-IR measurements which show
that the fraction of contact-ion pairs is reduced in electrolytes for
which limited growth of the resistance of the passive layers is obser
ved.