Ionic conductivity studies in PMMA/PVdF polymer blend electrolyte with lithium salts

Su’ait³

et al. 2011

TOMSJ

Abstract:The studies of rubber-polymer blends as solid polymer electrolyte for electrochemical devices application have been investigated. The electrolyte films were prepared by solution casting technique. The effect of poly(methyl methacrylate) (PMMA) and lithium tetrafluoroborate (LiBF 4 ), salt concentration on chemical interaction, ionic conductivity, structure and morphology of 49% poly(methyl methacrylate)-grafted natural rubber (MG49) have been analyzed by using fourier transform infrared spectroscopy (FT-IR), electrochemical impedance spectroscopy (EIS), x-ray diffraction (XRD) and scanning electron microscopy (SEM). Infrared analysis showed that the interaction between oxygen atoms and lithium ion occurred at ether (C-O-C) and carbonyl (C=O) group in the MMA host. The highest ionic conductivity for blended MG49-PMMA films is 8.3 10 -6 S cm -1 as compared to MG49 electrolyte with 9.6 10 -10 S cm -1 at 25 wt. % LiBF 4 . The structural analysis showed the reduction of MMA crystallinity phase at the highest conductivity for both systems. Meanwhile, morphological analysis shows that recrystallization of LiBF 4 salts have occurred in the electrolyte system after the optimum conductivity.

Section: Structural Studiesmentioning

confidence: 93%

“…crystal structure that can be traced. Thus, this provides a higher concentration of ions to freely move and increased the ionic conductivity value from ~10 -12 S cm -1 to ~10 -6 S cm -1 [2,20]. The cross-sectional view of the sample in Fig.…”

Section: Morphology Studiesmentioning

confidence: 99%

Study of MG49-PMMA Based Solid Polymer Electrolyte

Ahmad¹,

Su’ait³

et al. 2011

TOMSJ

“…The FTIR spectra of these materials are able to show the occurrence of the complexation and interaction between various constituents [16]. The FTIR of polymer electrolyte complexes are shown in Figs.…”

Section: Ftir Studiesmentioning

confidence: 99%

Effect of ethylene carbonate plasticizer and TiO2 nanoparticles on 49% poly(methyl methacrylate) grafted natural rubber-based polymer electrolyte

Low

Ahmad

2010

Ionics

The effect of plasticizer and TiO 2 nanoparticles on the conductivity, chemical interaction and surface morphology of polymer electrolyte of MG49-ECLiClO 4 -TiO 2 has been investigated. The electrolyte films were successfully prepared by solution casting technique. The ceramic filler, TiO 2 , was synthesized in situ by sol-gel process and was added into the MG49-EC-LiClO 4 electrolyte system. Alternating current electrochemical impedance spectroscopy was employed to investigate the ionic conductivity of the electrolyte films at 25°C, and the analysis showed that the addition of TiO 2 filler and ethylene carbonate (EC) plasticizer has increased the ionic conductivity of the electrolyte up to its optimum level. The highest conductivity of 1.1×10 −3 Scm −1 was obtained at 30 wt.% of EC. Fourier transform infrared spectroscopy measurement was employed to study the interactions between lithium ions and oxygen atoms that occurred at carbonyl (C=O) and ether (C-O-C) groups. The scanning electron microscopy micrograph shows that the electrolyte with 30 wt.% EC posses the smoothest surface for which the highest conductivity was obtained.

“…Figure 3 shows the XRD patterns of composite polymer electrolyte films with various concentration of NiO as well as for pure PEO and NiO filler. The appearance of amorphous region or the reduction of crystalline region would give a high ionic conductivity as com< pared to the crystalline or semicrystalline region as reported elsewhere [16][17][18][19][20][21]. The indexing of the two PEO peaks is reported to be at 19.5°and at 23.5°of monoclinic system [22].…”

Section: Resultsmentioning

confidence: 54%

Effect of NiO nanofiller concentration on the properties of PEO-NiO-LiClO4 composite polymer electrolyte

Fahmi

Ahmad

J Solid State Electrochem

et al. 2012

Composite polymer electrolyte films comprising polyethylene oxide (PEO) as the polymer host, LiClO 4 as the dopant, and NiO nanoparticle as the inorganic filler was prepared by solution casting technique. NiO inorganic filler was synthesized via sol-gel method. The effect of NiO filler on the ionic conductivity, structure, and morphology of PEO-LiClO 4 -based composite polymer electrolyte was investigated by AC impedance spectroscopy, X-ray diffraction, and scanning electron microscopy, respectively. It was observed that the conductivity of the electrolyte increases with NiO concentration. The highest room temperature conductivity of the electrolyte was 7.4×10 −4 S cm −1 at 10 wt.% NiO. The observation on structure shows the highest conductivity appears in amorphous phase. This result has been supported by surface morphology analysis showing that the NiO filler are well distributed in the samples. As a conclusion, the addition of NiO nanofiller improves the conductivity of PEO-LiClO 4 composite polymer electrolyte.