Effect of LiBF₄ Salt Concentration on the Properties of Plasticized MG49-TiO₂ Based Nanocomposite Polymer Electrolyte

Abstract

A nanocomposite polymer electrolyte (NCPE) comprising of 49% poly(methyl methacrylate) grafted natural rubber (MG49) as polymer host, titanium dioxide (TiO2) as a ceramic filler, lithium tetrafluoroborate (LiBF4) as dopant salt, and ethylene carbonate (EC) as plasticizer was prepared by solution casting technique. The ceramic filler, TiO2, was synthesized in situ by a sol-gel process. The ionic conductivity, chemical interaction, structure, and surface morphology of nanocomposite polymer electrolyte have been investigated as a function of wt% LiBF4. The interaction between lithium ions and oxygen atoms occurred at carbonyl and ether groups. The crystalline phase of polymer host slightly decreases with the addition of salt. TGA and DTG analysis suggested that the thermal stability of the electrolyte decreases with the salt content. The ionic conductivity of the electrolyte was found to increase with the increase of salt concentration and then decreased after an optimum value. The highest conductivity achieved was S cm−1 at 25 wt% of LiBF4.

A General Formula for Ion Concentration-Dependent Electrical Conductivities in Polymer Electrolytes

“…Similar observation has also been reported by other authors in other polymer electrolyte systems (Ahmad et al, 2011a;Fonseca et al, 2007). Ahmad et al (2011b) reported that in grafted natural rubber and poly (methyl methacrylate), containing lithium tetrafluoroborate. The degrees of crystallinity in systems of PCLbiodegradable gel polymer electrolyte with LiClO 4 , LiF 3 CSO 3 and LiBF 4 salts decreased nearly linear with increasing the salt concentration (Ahmad et al, 2011a).…”

“…SEM images of grafted natural rubber containing LiF 4 as reported by Ahmad el at. (2011a) showed darker tones in order of submicrometer sizes (Ahmad et al, 2011b). Roiter and Minko (2005) reported the appearances of real linear polymer chains in liquid state on a surface as recorded using an atomic force microscope have contour length of about 204 nm (Roiter and Minko, 2005).…”

Conductivity of Cellulose Acetate Membranes from Pandan Duri Leaves (Pandanus tectorius) for Li-ion Battery

“…It was contribute to the increasing in the conductivity due to the increase of free volume of its membrane and the ions can freely move [19]. For the used solvent system, acetone, the intrinsic viscosity was obtained a value of 119.72 mL/g and the Mark-Houwink-Sakurada constants are K = 0.133 and a = 0.616 [20].…”

UV-Cured polypropylene mesh-reinforced composite polymer electrolyte membranes

“…Also, the ester carbonyl absorption of PEGDA can be seen at 1725 cm -1 . In the spectrum ( Figure 2B), the peak at 1070 cm -1 is related to the BF-anion in the polymer composite system (21). In the spectrum of Figure 2C, the peak at 1144 cm -1 was due to -P = O vibrations and the absorption bands at 1025 and 970 cm -1 were ascribed to the P-OH stretching bands.…”