New materials that contain both organic and inorganic components have potentially new chemical and physical properties that can even lie outside those bracketed by their constituents. A series of hybrid polymer-inorganic nanocomposite materials was synthesized using various poly(ethylene oxide), LiCF₃SO₃, and zeolite mixtures. The series included mixtures of SiO₂, PEO-LiX, and PEO-GLYLiX, of varying concentrations (where GLY ¹/4 3-glycidoxypropyltrimethoxysi-lane, LiX is lithiated faujasite zeolite, and the Li⁺ source was LiCF₃SO₃; for all the LiCF₃SO₃-containing samples, the PEO oxygen: lithium mole ratio was 12: 1). Their degrees of crystallinity and glass transition temperatures relative to pure semicrystal-line PEO were found to be reduced on the addition of the inorganic components.