Effect of variation of different nanofillers on structural, electrical, dielectric, and transport properties of blend polymer nanocomposites

Abstract

In the present work, the effect of different nanofiller (BaTiO3, CeO2, Er2O3 or TiO2) on blend solid polymer electrolyte comprising of PEO and PVC complexed with bulky LiPF6 have been explored. The XRD analysis confirms the polymer nanocomposite formation. FTIR provides evidence of interaction among the functional groups of the polymer with the ions and the nanofiller in terms of shifting and changing peak profile. The highest ionic conductivity is ~2.3×10 -5 S cm -1 with a wide electrochemical stability window of ~3.5 V for 10 wt. % Er2O3. The real and imaginary part of dielectric permittivity follows the identical trend of the decreasing value with increase in the frequency. The particle size and the dielectric constant shows an abnormal trend with different nanofiller. The ac conductivity follows the universal power law. An effective mechanism has been proposed to understand the nanofiller interaction with cation coordinated polymer in the investigated system. storage/conversion devices must have (a) high ionic conductivity; (b) electrochemical stability window (>4 V); (c) low melting point; (d) high boiling point; (e) high chemical stability; (f) nontoxicity; (g) low cost and good compatibility with electrodes. Solid polymer electrolyte (SPEs) plays a dual role as an electrolyte as well as a separator which keeps both electrodes separate and avoids the user from using a spacer as in liquid electrolyte system. The first report on ionic conduction was given by P. V. Wright [5] and Fenton et al [6] in 1973 and it was concluded that polymer host dissolved with an alkali metal salt results in an ionic conductive system. The first application of novel polymer electrolyte in batteries was announced by Armand and his co-workers in 1978 [7]. Most devices are based on liquid/gel polymer electrolytes due to their high ionic conductivity (10 -3 -10 -2 Scm -1 ) and compatible with electrodes. But poor mechanical strength, freezing at low temperature, leakage and flammable nature limits their application in commercial use. This motivates the researchers toward better replacement of liquid polymer electrolyte with a solvent free polymer electrolyte having high ionic conductivity, leak proof, flexibility, wide electrochemical window, good mechanical strength, light weight and ease of preparation [8-10]. Solid polymer electrolytes (SPEs) fulfill all above requirements and have attracted researchers globally towards development for their potential application in portable electronics and electrochemical devices [11]. The commonly used host polymer for preparation of polymer nanocomposite films (PNCs) is PEO [12], PAN [13], PMMA [14], PEMA [15] and PVC [16]. Out of aforesaid host polymers, polyethylene oxide (PEO) is undoubtedly the best host polymer used as SPEs with strong, unstrained C-O, C-C, C-H bonds and it has high dielectric constant, easy availability, and high ionic conductivity in amorphous phase, low glass transition temperature, high flexibility, and good dimensional and chemical stability. But PEO possesses low ion...

Effect of salt concentration on dielectric properties of Li-ion conducting blend polymer electrolytes

“…The amount of PEO (0.5 g) and PAN (0.5 g) was kept fixed for all solid polymer electrolytes, and concentration of salt was varied as Ö/Li=8, 10,14,16,18,20 First, the appropriate amount of the PEO was dissolved in DMF at room temperature and stirred on a magnetic stirrer.…”

Chemically Modified Polyvinyl Butyral Polymer Membrane as a Gel Electrolyte for Lithium Ion Battery Applications

“…The modification of PVB can be demonstrated by the FTIR measurements . As shown in Figure a, the peak at 1666 cm −1 in the spectrum of mPVB membrane is ascribed to the CO stretching vibration of units II and III.…”

“…The modification of PVB can be demonstrated by the FTIR measurements. [21][22][23] As shown in Figure 3a, the peak at 1666 cm −1 in the spectrum of mPVB membrane is ascribed to the CO stretching vibration of units II and III. The shift could be contributed to its overlap with the blending vibration peaks of the residual crystal water from the reaction procedures, which are not found in the FTIR spectrum of the PVB membrane.…”

Tailoring the Structural, Morphological, Electrochemical, and Dielectric Properties of Solid Polymer Electrolyte

“…The complex conductivity of the solid polymer electrolytes is expressed by equation 8, * ( ) = ′ ( ) + ′′ ( ) (8) The real part is expressed as ′ = = ε ε ′′ = ε ε ′ tan , and imaginary part as ′′ = ε ε ′ = ε ε ′′ tan . Where , ε o , ε ′′ are the angular frequency, dielectric permittivity of the free space and dielectric loss.…”

“…However, SPE possesses lower ionic conductivity at ambient temperature. To overcome the poor ionic conductivity various approaches are manifested to develop new materials such as polymer blending, nanofiller dispersion, incorporation of ionic liquids/plasticizer [5][6][7][8][9][10][11][12][13][14][15][16].…”