Composite polymer electrolyte systems composed of poly(methyl methacrylate) (PMMA) as the host polymer, lithium trifluoromethanesulphonate (also known as lithium triflate; LiCF 3 SO 3 ) as dopant salt, and a variety of different concentrations of nano-sized fumed silica (SiO 2 ) as inorganic filler were studied. The effect upon addition of SiO 2 on the ionic conductivity of the composite polymer electrolytes was investigated, and it was proven that the ionic conductivity had been enhanced. In addition, the interfacial stability also showed improvement. Maximum conductivity was obtained upon addition of 2 wt.% SiO 2 . The complexation of PMMA and LiCF 3 SO 3 was verified through Fourier transform infrared studies. The thermal stability of the polymer electrolytes was also found to improve after dispersion of inorganic filler. This was proven in the thermogravimetric studies.

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