Effect of varying lithium perchlorate salt concentration on electrochemical and physical properties of polymer gel electrolytes containing heat-resistant poly(methyl methacrylate) and succinonitrile

In this work, effect of varying lithium perchlorate (LiClO4) salt concentration in polymer gel electrolytes (PGE) containing heat resistant polymethyl methacrylate (PMMA), and succinonitrile (SN) is investigated via electrochemical and physical properties. The electrolyte specimen with high LiClO4 salt concentration of 1.5 M supports maximum ionic conductivity of 4.9 x 10(-5) S cm(-1) and electrochemical stability window of similar to 4 V. The ion-transport parameters evaluated from the tangent loss studies confirms that the optimized electrolyte possesses diffusivity (D) of 4.52 x 10(-2), mobility (mu) of 1.746 cm(2) V-1 s(-1), number of charge carriers (N) of 1.78 x 10(14) cm(-3) and N mu of 3.106 x 10(14) cm(-1) V-1 s(-1). The dielectric constant studies show that the optimized electrolyte possesses maximum dielectric constant and lower value of modulus towards the high frequency region. The thermogravimetric and differential scanning calorimetry studies confirms that the prepared electrolytes offer weight loss of < 9% up to 373 K and maintains the gel phase up to 570 K, respectively. X-ray diffraction suggest that the PGE system becomes more amorphous with progressive addition of LiClO4 up to 1.5 M, while the Fourier transform Infra-red (FTIR) spectroscopy study reveal the salt-polymer interactions. [GRAPHICS] .