Morphological, infrared, and ionic conductivity studies of poly(ethylene oxide)–49% poly(methyl methacrylate) grafted natural rubber–lithium perchlorate salt based solid polymer electrolytes

Abstract

The potential of poly(ethylene oxide) (PEO) and 49% poly(methyl methacrylate) grafted natural rubber (MG49) as a polymer host in solid polymer electrolytes (SPE) was explored for electrochemical applications. PEO-MG49 SPEs with various weight percentages of lithium perchlorate salt (LiClO 4 ) was prepared with the solution casting technique. Characterization by scanning electron microscopy, Fourier transform infrared spectroscopy, and impedance spectroscopy was done to investigate the effect of LiClO 4 on the morphological properties, chemical interaction, and ionic conductivity behavior of PEO-MG49. Scanning electron microscopy analysis showed that the surface morphology of the sample underwent a change from rough to smooth with the addition of lithium salts. Infrared analysis showed that the interaction occurred in the polymer host between the oxygen atom from the ether group (CAOAC) and the Li þ cation from doping salts. The ionic conductivity value increased with the addition of salts because of the increase in charge carrier up to the optimum value. The highest ionic conductivity obtained was 8.0 Â 10 À6 S/cm at 15 wt % LiClO 4 .

Elastomers and Their Potential as Matrices in Polymer Electrolytes

“…For PEO-MG49-LiClO 4 polymer blend electrolyte system, complexation between Li + ions and the polymer blend was confirmed by Ahmad and co-workers [39] from the shifting of bands belonging to PEO and PMMA in MG49. The triple band due to PEO initially located at 1146, 1099, and 1060 cm Yap and co-workers [5] reported the presence of free ions (1032 cm −1 ) and ion pairs (1040 cm −1 ) in the MG30-LiCF 3 SO 3 samples.…”

“…Pure MG49 exhibited ambient conductivity of 1.0 × 10 −12 S cm A polymer blend system that comprised PEO-MG49 with varied wt.% PEO was reported by [39]. Photograph of the PEO:MG49 with wt.% ratio of 60:40 showed a more homogeneous surface and free-standing film, as compared to other wt.…”

Structural and dielectric studies of amorphous and semicrystalline polymers blend‐based nanocomposite electrolytes

“…different methods of preparation (solution–cast, melt compounding, ultrasonic assisted, microwave irradiated, ion irradiated methods, etc. ), addition of liquid plasticizers, dispersion of inorganic nanofillers, use of different salts, and their blending with other polymers . These studies revealed that the addition of plasticizers always increased the degree of salt dissociation and the amorphous phase of the SPE materials, which resulted in the increase of their ionic conductivity.…”

“…In the last one decade, the solid polymeric electrolytes (SPEs) have been a topic of great technological interests because of their uses in the high power and high energy density storage lithium‐ion batteries . These batteries are the promising power sources for the modern portable electronic equipments and the electrical vehicles.…”

“…The main characteristics of the SPEs are their light weight, leak proof, flexible and compact in size and longer life span with improved safety and electrochromical performances, which make them superior over the liquid and ceramic electrolytes. Poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) are better considerations among the polymers host for preparation of the SPE materials. Owing to the environmental friendly, high solvating power in the solid state for alkali metal salts and highly flexible type film forming ability of the PEO, it has become the first choice of the investigators for preparation of SPEs both by the solution–cast as well as melt compounding methods.…”