INVESTIGATION OF THE ROLE OF DIFFERENT PLASTICIZERS IN PVdC-co-AN BASED GEL POLYMER ELECTROLYTES

Abstract

In recent years, large scientific and technical interest in lithium polymer secondary batteries leads to the
development of electrolytes with high electrochemical windows. Several researches deliberate the performance of
polymer electrolytes owing to its high energy density, ease of preparation, compatibility between the electrodes etc.
Numerous strategies are followed to match the ionic conductivity and mechanical stability of polymer electrolytes. This
work describes the clear effect of plasticizer on the performance of lithium ion batteries with four different plasticizer
such as ethylene carbonate (EC), propylene carbonate (PC), γ-Butyrolactone (γBL ) and diethyl carbonate (DEC) were
used. Gel polymer electrolytes comprising of PVdC- AN (52wt%) – LiClO4 (8wt.%)–ZrO2 (6wt%)- X(40) (X- EC,PC,
γBL, DEC) were prepared by solution casting technique. The structural and complexation formation of the prepared
electrolytes have been confirmed by XRD and FTIR analysis. The effect of plasticizer on ionic conductivity is depicted
using a.c impedance studies in the temperature range 303 -363 K. The highest ionic conductivity value 1.2×10-3
 S/ cm
was measured for the sample incorporating EC, owing to its high dielectric constant (89.6). Thermal stability of the
samples has been examined using TG/DTA. The maximum conducting sample, with plasticizer EC can be operated up
to 160 C. The morphology is analyzed by SEM.