International Journal of Engineering Research

V. Manjunatha ¹, H. Devendrappa ¹

Affiliations
1 Department of Physics, Mangalore University, Mangalagangothri-574199, IN

Abstract

This paper presents information concerning the thermal, conductivity and miracle morphological properties of lithium doped polymer electrolytes applicable for high-energy density batteries and other solid state electrochemical devices. DSC results show the glass transition temperature decreases from -78.01°C (PEO) to -79.62°C (doped PEO), and decrease in crystalline nature, indicate the amorphous phase becomes more flexible, and the exchange of ions becomes very easy. As a result, activation energy lowers and hence the ionic conductivity increases. The dc conductivity increases from 6.25x10^-8 Scm^-1 to 6.56x10^-4 Scm^-1 at room temperature, reveals the addition of dopant favors to form more transient cross links, with dimensional stable morphology due to large cat ion-anion association effects and decrease in viscosity and, hence, increase in chain flexibility, mobility of Li⁺, and conductivity. The incorporation of lithium salt into the PEO improves the smooth morphology, with the development of streaks and reduction in crystalline nature. The morphology of the film changes substantially on addition of dopant.

Keywords

DSC, DC Conductivity, SEM, Crystallinity.

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