Composite electrolyte films consisting of poly (acrylonitrile), poly (vinylidene Fluoride), ethylene carbonate, propylene carbonate, lithium tetra fluoroborate (LiBF4) and also titanium dioxide (TiO2) particles have been prepared by solution casting technique. The effect of inorganic filler on the conductivity of the blended polymer electrolyte has been studied. A conductivity of 3.1 x 10-5 S cm-1 is achieved at room temperature for the composition PAN-PVdF–LiBF4-EC-PC (21-10-8-33.3-27.7), whereas it improves two orders of magnitude (i.e. 5.624 ×10−3 S cm−1) upon dispersing fine particles of TiO2 as inert filler into the matrix. The role of ceramic phase is to increase the ionic conductivity and to reduce the melting temperature which is ascertained from conductivity and thermo gravimetric/differential thermal analysis respectively.