Effect of ionic liquid (BMIM BF4) dispersion on Li+ ion oxide glass and glass-ceramics has been investigated. Addition of ionic liquid in a very small amount (0.5-5 wt.%) enhances the ionic conductivity significantly. For a typical glass composition 60Li(2)SO(4)-40(0.5Li(2)O-0.5P(2)O(5)), with grain size of similar to 50 nm, dispersion of similar to 5 wt.% ionic liquid leads to a conductivity rise of similar to 2-4 orders of magnitude. Structure of ionic liquid dispersed glass and glass-ceramic composites has been investigated by X-ray diffraction and FE-SEM, and thermal properties by DSC. It has been revealed by a galvanic cell method, impedance spectroscopy and dc polarization technique that these composites are essentially ionic in nature. Based on these investigations, a model for electrical transport has been proposed according to which Li+ ions are the majority charge carriers in these composites. The model suggests that ionic liquid acts like a filler between the glass/glass-ceramic grains and Li+ ions mainly migrate through these channels. These composites appear promising for Li+ ion battery applications. (C) 2015 Elsevier B.V. All rights reserved.