AC impedance and dielectric spectroscopic studies of Mg2 +  ion conducting PVA–PEG blended polymer electrolytes

Polu, Anji Reddy; Kumar, Ranveer

doi:10.1007/s12034-011-0132-2

Cited by 75 publications

(33 citation statements)

References 14 publications

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“…, where d is the thickness and A is the surface area of the sample [34]. conductivity in an electrode is attributed to increased ionic mobility and increased ionic charge carrier concentration.…”

Section: Electronic Propertiesmentioning

confidence: 99%

Impact of Lithium Composition on Structural, Electronic and Optical Properties of Lithium Cobaltite Prepared by Solid-state Reaction

et al. 2014

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The lithium-cobalt oxide Li x CoO 2 is a promising candidate as highly active cathode material of lithium ion rechargeable batteries. The crystalline-layered lithium cobaltite has attracted increased attention due to recent discoveries of some extraordinary properties such as unconventional transport and magnetic properties. Due to layered crystal structure, Li contents (x) in Li x CoO 2 might play an important role on its interesting properties. LiCoO 2 crystalline cathode material was prepared by using solid-state reaction synthesis, and then Li x CoO 2 (x<1) has been synthesized by deintercalation of produced single-phase powders. Structure and morphology of the synthesized powders were investigated by X-ray diffraction (XRD), Infrared spectroscopy, Impedance analyzer etc. The influence of lithium composition (x) on structural, electronic and optical properties of lithium cobaltite was studied. Temperature dependent electrical resistivity was measured using four-probe technique. While Li x CoO 2 with x = 0.9 is a semiconductor, the highly Li-deficient phase (0.75 ≥ x ≥ 0.5) exhibits metallic conductivity. The ionic conductivity of Li x CoO 2 (x = 0.5 -1.15) was measured using impedance spectroscopy and maximum conductivity of Li 0.5 CoO 2 was found to be 6.5×10-6 S/cm at 273 K. The properties that are important for applications, such as ionic conductivity, charge capacity, and optical absorption are observed to increase with Li deficiency.

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Section: Electronic Propertiesmentioning

confidence: 99%

Impact of Lithium Composition on Structural, Electronic and Optical Properties of Lithium Cobaltite Prepared by Solid-state Reaction

et al. 2014

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“…At high frequency, the periodic reversal of the applied field occurs very rapidly so that almost no charges were able to migrate in the direction of the field. 12 The variation of dielectric constant at a fixed frequency of 100 Hz as a function of filler concentration is given in Figure 2 and found to follow the same trend as that of electrical conductivity. This feature confirms the fact that the best conducting sample with 5 wt % Al 2 O 3 nanofiller has the highest number of charge carriers, as concluded from FTIR analysis.…”

Section: Resultsmentioning

confidence: 68%

“…At low frequency, charges would have more time to migrate and accumulate at the electrode/electrolyte interface and thereby contribute to the observed dielectric constant. At high frequency, the periodic reversal of the applied field occurs very rapidly so that almost no charges were able to migrate in the direction of the field …”

Section: Resultsmentioning

confidence: 99%

Structural and AC impedance studies on nanocomposite polymer electrolytes based on poly(ε‐caprolactone)

Sownthari

Suthanthiraraj

2014

J of Applied Polymer Sci

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Nanocomposite polymer electrolyte (NCPE) films of [75 wt % poly(ε‐caprolactone) : 25 wt % zinc triflate] + x wt % nanofiller Al2O3 (x = 1, 3, 5, 7) were prepared by solution cast technique. Such NCPE films were characterized using Fourier transform infrared and AC impedance spectroscopic techniques. Complexation of polymer with salt and nanofiller was revealed from FTIR analysis. On the other hand, an apparent increase in the number density of charge carriers upto 5 wt % loading of the nanofiller was also confirmed. Furthermore, AC impedance spectroscopic studies have shown that ionic conductivity increases with the addition of Al2O3 and reaches a maximum of 2.5 × 10−5 S cm−1 at room temperature for 5 wt % loading of nanofiller. The dielectric behavior of all the synthesized samples has also been analyzed and presented. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40524.

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“…Also the ionic conduction varies with temperature and it shows the Arrhenius behavior. The temperature dependence of conductivity is given by σ = σ 0 exp(− E a /KT) where σ 0 is the pre-exponential factor, E a the activation energy and K the Boltzmann constant [22]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of nanocrystalline A6Sb4ZrO18 (A= Ca, Sr and Ba) functional ceramics

George¹,

Thomas²,

John³

et al. 2015

Solid State Ionics

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AC impedance and dielectric spectroscopic studies of Mg2 + ion conducting PVA–PEG blended polymer electrolytes

Cited by 75 publications

References 14 publications

Impact of Lithium Composition on Structural, Electronic and Optical Properties of Lithium Cobaltite Prepared by Solid-state Reaction

Impact of Lithium Composition on Structural, Electronic and Optical Properties of Lithium Cobaltite Prepared by Solid-state Reaction

Structural and AC impedance studies on nanocomposite polymer electrolytes based on poly(ε‐caprolactone)

Synthesis and characterization of nanocrystalline A6Sb4ZrO18 (A= Ca, Sr and Ba) functional ceramics

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