Effects of preparation methods on structure, ionic conductivity and dielectric relaxation of solid polymeric electrolytes

Choudhary, Shobhna; Sengwa, R. J.

doi:10.1016/j.matchemphys.2013.06.053

Cited by 66 publications

(67 citation statements)

References 47 publications

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“…When the semicrystalline PEO is melted and subsequently cooled, it frequently crystallizes to form a morphology composed of symmetrical super-structures called spherulites [7,12]. The SEM images confirm that these symmetrical structures of PEO grow from a central point when several lamellae form together as a nucleus [29,30,37].…”

Section: Resultsmentioning

confidence: 79%

“…Earlier studies [1,3,7,12] have established that the repeating monomer units in the long chain of polymers form stacks of parallel segments called lamellae, which result in chain folding back on themselves. When the semicrystalline PEO is melted and subsequently cooled, it frequently crystallizes to form a morphology composed of symmetrical super-structures called spherulites [7,12].…”

Section: Resultsmentioning

confidence: 99%

“…Further, the SiO 2 has mild reactivity and good chemical properties which recognized it as potential nanofiller in the preparation of polymer nanocomposite (PNC) materials. The presence of ether oxygen atom in PEO backbone realizes it as solid solvent for alkali metal salts, and therefore, it is frequently used as a potential matrix for the preparation of flexible type novel solid polymeric electrolyte (SPE) film for the rechargeable lithium-ion batteries [8][9][10][11][12]. The addition of a small amount of SiO 2 in the PEO matrix has become a common practise to improve the ion transportation mechanism in the SPE materials [13][14][15], and also the sensing performance of such hybrid material [16].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric dispersion and relaxation studies of melt compounded poly(ethylene oxide)/silicon dioxide nanocomposites

Choudhary

Sengwa

2015

Polym. Bull.

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The polymer nanocomposite films consisted of poly(ethylene oxide) (PEO) matrix with different weight percentage concentrations of silicon dioxide (SiO 2 ) as nanofiller have been prepared by melt-pressed technique. The complex dielectric function, ac electrical conductivity, electric modulus and complex impedance spectra of the nanocomposite films have been investigated over the frequency range 20 Hz to 1 MHz, at room temperature. The real part of permittivity increases with decrease of frequency below 10 kHz, whereas these values remain almost constant in the high-frequency region. The high-frequency permittivity of these nanocomposites decreases with increase of SiO 2 concentration. The relaxation peaks are observed in dielectric loss, loss tangent and loss modulus spectra of the nanocomposites which are corresponding to the PEO segmental motion (local chain dynamics). It is found that the PEO chain dynamics is much faster in the nanocomposites as compared to that in the pristine PEO film. The real part of electrical conductivity spectra of these materials has linear behaviour of two different slopes in the frequency regions of above 10 kHz and below 1 kHz. The interactions between PEO chain and SiO 2 nanoparticles, and their effect on PEO spherulites in these nanocomposites are explored by X-ray diffraction measurements.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric dispersion and relaxation studies of melt compounded poly(ethylene oxide)/silicon dioxide nanocomposites

Choudhary

Sengwa

2015

Polym. Bull.

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“…Figure [21,[25][26]. Further, the absence of any NaPF6 peak reveals the complete dissociation of salt and complex formation is confirmed [27][28][29]. After addition of SN in the polymer salt matrix, the lowering in the intensity of PEO peak located at 19.03° and 23.1° evidence the effective role played by SN.…”

Section: 2x-ray Diffraction (Xrd) Analysismentioning

confidence: 80%

“…Now, the dipoles are unable to orient themselves in the applied filed direction. This eliminates the electrode polarization and dominance of relaxation mechanism occurs, which leads to steady state at high frequency [27,[57][58][59][60].…”

Section: Electrochemical Stability Windowmentioning

confidence: 99%

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

Arya¹

2018

Preprint

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Abstract:Herein, we present preparation of solid polymer electrolyte (SPE) comprising of PEO, NaPF6 and varying fraction of Succinonitrile (SN) by standard solution cast technique. The morphological features and structural properties were studied by the FESEM, XRD, respectively. FTIR was performed to study the interactions between polymer host, salt, and SN. Impedance spectroscopy, Transference number measurements, LSV and CV were used to examine the electrochemical properties. The complex permittivity/conductivity & modulus were studied to understand the dielectric properties by evaluating the dielectric strength, relaxation time, hopping frequency and dc conductivity. Based on the experimental results an interaction mechanism is presented.

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Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

Sengwa

Choudhary

2014

J of Applied Polymer Sci

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The nanocomposite films comprising polymer blends of poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP), poly(ethylene oxide) (PEO), and poly(ethylene glycol) (PEG) with montmorillonite (MMT) clay as nanofiller were prepared by aqueous solution casting method. The X‐ray diffraction studies of the PVA–x wt % MMT, (PVA–PVP)–x wt % MMT, (PVA–PEO)–x wt % MMT and (PVA–PEG)–x wt % MMT nanocomposites containing MMT concentrations x = 1, 2, 3, 5 and 10 wt % of the polymer weight were carried out in the angular range (2θ) of 3.8–30°. The values of MMT basal spacing d001, expansion of clay gallery width Wcg, d‐spacing of polymer spherulite, crystallite size L and diffraction peak intensity I were determined for these nanocomposites. The values of structural parameters reveal that the linear chain PEO and PEG in the PVA blend based nanocomposites promote the amount of MMT intercalated structures, and these structures are found relatively higher for the (PVA–PEO)–x wt % MMT nanocomposites. It is observed that the presence of bulky ester‐side group in PVP backbone restricts its intercalation, whereas the adsorption behavior of PVP on the MMT nanosheets mainly results the MMT exfoliated structures in the (PVA–PVP)–x wt % MMT nanocomposites. The crystallinities of the PEO and PEG were found low due to their blending with PVA, which further decreased anomalously with the increase of MMT concentration in the nanocomposites. The decrease of polymer crystalline phase of these materials confirmed their suitability in preparation of novel solid polymer nanocomposite electrolytes. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40617.

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Effects of preparation methods on structure, ionic conductivity and dielectric relaxation of solid polymeric electrolytes

Cited by 66 publications

References 47 publications

Dielectric dispersion and relaxation studies of melt compounded poly(ethylene oxide)/silicon dioxide nanocomposites

Dielectric dispersion and relaxation studies of melt compounded poly(ethylene oxide)/silicon dioxide nanocomposites

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

Structural characterization of hydrophilic polymer blends/montmorillonite clay nanocomposites

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