The present work describes how activation energy changes in Poly-Ethylene Oxide- based mixed solid polymer electrolyte(SPE) which are broadly applied in Lithium or Li-ion battery. Here we take three different temperatures such as 150C, 280C and 400C and five different single or mixed electrolytes. Ionic conductivities of the mixed SPE’s are found to be slightly greater than those of single SPE’s. log sigma Vs. 1/T plots indicate Arrhenius type behavior with activation of transport around 17 Cal. This plot (Arrhenius type behavior) shows that in case of mixed electrolyte, activation energy decreases and as well as ion conductivity increases than that of single electrolyte