Impact of polymer blending on ionic conduction mechanism and dielectric properties of sodium based PEO-PVdF solid polymer electrolyte systems

Yalla Mallaiah,Venkata Ramana Jeedi,R Swarnalatha,A Raju,S Narender Reddy,A Sadananda Chary

doi:10.1016/j.jpcs.2021.110096

Yalla Mallaiah, Venkata Ramana Jeedi + Show 4 more

Open Access

https://doi.org/10.1016/j.jpcs.2021.110096

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Abstract

Solid polymer blend electrolyte systems have been prepared with Poly (ethylene oxide) (PEO), Poly (Vinylidene fluoride) (PVdF) and complexed with NaNO3 salt by using solution cast method. The complexation of salt with polymer blend has been verified by X-Ray diffractogram, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopic studies. AC and DC conductivity measurements on these polymer blends were carried out by changing the weight percentages of PEO and PVdF with a constant weight percentage of NaNO3. The electric modulus(M') and the dielectric properties for all the polymer blend systems have been investigated with impedance spectroscopy in the frequency range 100–30 MHz. The variation of ionic conductivity of the blend polymer electrolyte systems with temperature followed Arrhenius behaviour and the maximum ionic conductivity 9.334 × 10−5 S cm−1 was observed for PEO:PVdF:NaNO3 (80:20:5) at room temperature which is attributed to the formation of the amorphous phase.

Highlights

As compared with the liquid electrolytes, the solid polymer electrolytes (SPEs) have great attention of safety and nonleakage [1]
Solid blend polymer electrolyte systems have been prepared by varying PEO and PVDF weight percentages with constant 5 wt% of NaNO3 by solution cast technique
3.1 X-Ray Diffraction studies: Fig.1 shows the X-Ray diffraction patterns of PEO, PVdF, NaNO3 and polymer blend complexed with NaNO3.The characteristic peaks of pure NaNO3(29.110) and PEO (19.080, 23.520) signify the crystalline form of these two materials

Summary

Introduction

As compared with the liquid electrolytes, the solid polymer electrolytes (SPEs) have great attention of safety and nonleakage [1]. From the economical and commercial viewpoint, PEO is the most studied polymer due to a low-cost membrane with good ionic conductivity, mechanical stability and enhanced dimensional property [6]. Particular attention has been focused on the studies of PEO based polymer electrolytes complexed with lithium salts because of their direct applications in high energy density rechargeable batteries [7]. The crystallinity of PEO must be lowered to a certain extent to promote better ion transmission resulting in good ionic conductivity [8] Various approaches, such as co-polymerization, blending [9,10], plasticization [11], and inorganic nanofillers [12] have been added to enhance the ionic conductivity in the polymer electrolyte and its performance.

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