Ys. Moon et al., ION-INTERACTION IN (ETHYLENE-OXIDE) BASED POLYMER ELECTROLYTE, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 280, 1996, pp. 187-192
A new polymer electrolyte based on ethylene oxide unit was synthesized
and complexed with lithium salts for high ionic conductivity at room
temperature. The salts used were lithium perchlorate and lithium trifl
ate. FTIR and FTRaman spectrosocpies were used to characterize ion-ion
or ion-polymer interaction and to determine the relative amount of io
ns present in the complexes. The spectroscopic analysis was performed
as a function of [EO]/[Li+] ratio (20 similar to 5) and temperature (u
p to 120 degrees C). The free ion percentages in the lithium perchlora
te-complexes rapidly decreased to [EO]/[Li+] ratio of 10 and then leve
lled off. But its ionic conductivity linearly decreased over the salt
concentration range studied. The negative temperature dependence of fr
ee ion concentration was observed for the lithium triflate-complexes.