scholarly journals Study FTIR and AC Conductivity of Nanocomposite Electrolytes

2021 ◽  
Vol 19 (51) ◽  
pp. 15-22
Author(s):  
Elaaf Ali Swady ◽  
Mohammed K. Jawad
Keyword(s):  
Room Temperature ◽  
Ethylene Carbonate ◽  
Fixed Ratio ◽  
Significant Degree ◽  
Zno Nanoparticle ◽  
Casting Technique ◽  
Maximum Value ◽  
High Dielectric Permittivity ◽  
Nanocomposite Electrolytes ◽  
High Dielectric

 In the present work polymer electrolytes were formulated using the solvent casting technique. Under special conditions, the electrolyte content was of fixed ratio of polyvinylpyrolidone (PVP): polyacrylonitrile (PAN) (25:75), ethylene carbonate (EC) and propylene carbonate (PC) (1:1) with 10% of potassium iodide (KI) and iodine I2 = 10% by weight of KI. The conductivity was increased with the addition of ZnO nanoparticles. It is also increased with the temperature increase within the range (293 to 343 K). The conductivity reaches maximum value of about (0.0296 S.cm-1) with (0.25 g) ZnO. The results of FTIR for blend electrolytes indicated a significant degree of interaction between the polymer blend (PVP and PAN) and the KI salt. From the electrolyte observations of the nanocomposites, the broad peak became narrower after adding the ZnO nanoparticle to the KI salt. The dielectric reaction decreased with the increase of the frequency at room temperature. The high dielectric permittivity of the polymer at lower frequencies can be attributed to the dipoles having sufficient time to get aligned with the electric field, resulting in higher polarization.

Studies on Sodium Ion Conducting Gel Polymer Electrolytes

2013 ◽  
Vol 594-595 ◽  
pp. 786-792 ◽  
Author(s):  
Khairul Bahiyah Md Isa ◽  
Lisani Othman ◽  
Nurul Husna Zainol ◽  
Siti Mariam Samin ◽  
Woon Gie Chong ◽  
...  
Keyword(s):  
Polymer Electrolytes ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Gel Polymer Electrolyte ◽  
Sodium Ion ◽  
Casting Technique ◽  
Ionic Salt ◽  
Temperature Dependence Of Conductivity ◽  
Solution Casting Technique ◽  
Ion Conducting

Sodium ion conducting gel polymer electrolyte (GPE) films consisting of polyvinylidenefluoride-co-hexafluoropropylene (PVdF-HFP) as a polymer host were prepared using the solution casting technique. Sodium trifluoromethane-sulfonate (NaCF3SO3) was used as an ionic salt and the mixture of ethylene carbonate (EC) and propylene carbonate (PC) as the solvent plasticizer. The GPE films were found to be stable up to temperature of 145 °C as shown by TGA analysis. The AC impedance study show that the optimum conductivity of 2.50 x 10-3 S cm-1 at room temperature is achieved for the film containing 20 wt.% of NaCF3SO3 salt. The temperature dependence of conductivity obeys VTF relation in the temperature range of 303 K to 373 K.

Epitaxial Pb(Zr0.52Ti0.48)O3/La0.7(Pb,Sr)0.3MnO3 Ferroelectric/CMR Memory Optimized for Room Temperature Operation

1999 ◽  
Vol 602 ◽  
Author(s):  
Daniel Lundström ◽  
Jan Yilbar ◽  
S.I. Khartsev ◽  
Alex Grishin ◽  
Masanori Okuyama
Keyword(s):  
Room Temperature ◽  
Processing Parameters ◽  
Superior Performance ◽  
Maximum Temperature ◽  
Low Loss ◽  
Colossal Magnetoresistive ◽  
Saturation Polarization ◽  
High Dielectric Permittivity ◽  
Ferroelectric Layer ◽  
High Dielectric

AbstractEpitaxial ferroelectric/colossal magnetoresistive PbZr0.52Ti0.48O3/La0.7(Pb,Sr)0.3MnO3 (PZT/LPSMO) thin film heterostructures have been grown onto SrTiO3 single crystals by KrF pulsed laser deposition technique to fabricate nonvolatile magnetosensitive memory. Colossal magnetoresisitivity (CMR) in LPSMO film has been tailored to room temperature by compositional control to get the maximum temperature coefficient of resistivity of 7.3 %K−1 @ 295 K and maximim magnetoresistivity of 27% @ 7 kOe and 300 K. The main processing parameters have been optimized to preserve CMR performance in LPSMO film after deposition of the top ferroelectric layer. Vertical Au/PZT/LPSMO/STO capacitor cell possesses very high dielectric permittivity about 1500 and rather low loss of 5% at 1 kHz, saturation polarization of 40.4 µC/cm2, remnant polarization of 20.6 µC/cm2, coercive field of 22.8 kV/cm, and no visible fatigue after 1.33.108 reversals. Three top contact metals: Au, Pt, and Ta, deposited at room temperature, have been examined. As compared with Ta, Pt and Au top contacts show superior performance regarding to combined properties: high remnant and saturation polarization, low loss and no fatigue while top Ta contacts have been found to be more efficient to reduce leakage in ferroelectric film.

Nanocomposite Based Electrolytes for Lithium-Ion Batteries

1999 ◽  
Vol 575 ◽  
Author(s):  
M.W. Riley ◽  
P.S. Fedkiw ◽  
S.A. Khan
Keyword(s):  
Steady State ◽  
Elastic Modulus ◽  
Lithium Ion Batteries ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
Current Method ◽  
Transference Numbers ◽  
Steady State Current ◽  
Nanocomposite Electrolytes

ABSTRACTNanocomposite electrolytes based on lithium hectorite (LiHect) clay dispersed in highdielectric organic solvents such as ethylene carbonate (EC) and propylene carbonate (PC) are shown to exhibit room-temperature conductivities exceeding 10−4 S/cm. The LiHect-based composites reveal lithium ion transference numbers of ∼0.8, as measured by the steady-state current method. In addition, dynamic rheological techniques show this system to be mechanically stable with elastic modulus G' exceeding 107 dynes/cm 2 and yield stress exceeding 104 dynes/cm2.

The Giant Dielectric Constant of Y2NiMnO6 Ceramics for DC Bias

2017 ◽  
Vol 866 ◽  
pp. 277-281
Author(s):  
Naphat Albutt ◽  
Suejit Pechprasarn ◽  
Pattaraporn Damkoengsuntorn ◽  
Thanapong Sareein
Keyword(s):  
Dielectric Constant ◽  
Dielectric Permittivity ◽  
Room Temperature ◽  
Frequency Range ◽  
Electronic Components ◽  
Giant Dielectric ◽  
High Dielectric Permittivity ◽  
Dc Bias ◽  
Giant Dielectric Constant ◽  
High Dielectric

In this work, the uses of giant dielectric constant of Y2NiMnO6 ceramics were investigated in the frequency range from 1 kHz to 3 MHz. The Y2NiMnO6 ceramics were sintered at 1400 °C for 6, 12, 18 and 24 hours, respectively. The dielectric properties of Y2NiMnO6 ceramics were examined in dc bias from 0 to 1.5 volt at room temperature. We found that all sintering times displayed high dielectric permittivity at frequencies below 105 Hz, above which the values decreased significantly, applied dc bias also reduced dielectric permittivity. The peak of dielectric loss decreased significantly at high dc bias due to decreased contribution of dc conductivity in grain ceramics. This research has characterised electrical properties of Y2NiMnO6 ceramics which maybe suitable for electronic components including batteries and capacitors.

scholarly journals Phthaloylchitosan-Based Gel Polymer Electrolytes for Efficient Dye-Sensitized Solar Cells

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
S. N. F. Yusuf ◽  
M. F. Aziz ◽  
H. C. Hassan ◽  
T. M. W. J. Bandara ◽  
B.-E. Mellander ◽  
...  
Keyword(s):  
Polymer Electrolytes ◽  
Room Temperature ◽  
Fill Factor ◽  
Ethylene Carbonate ◽  
Dye Sensitized Solar Cells ◽  
Gel Polymer Electrolytes ◽  
Lithium Iodide ◽  
Dye Sensitized ◽  
Maximum Value ◽  
Sensitized Solar Cells

Phthaloylchitosan-based gel polymer electrolytes were prepared with tetrapropylammonium iodide, Pr4NI, as the salt and optimized for conductivity. The electrolyte with the composition of 15.7 wt.% phthaloylchitosan, 31.7 wt.% ethylene carbonate (EC), 3.17 wt.% propylene carbonate (PC), 19.0 wt.% of Pr4NI, and 1.9 wt.% iodine exhibits the highest room temperature ionic conductivity of 5.27 × 10−3 S cm−1. The dye-sensitized solar cell (DSSC) fabricated with this electrolyte exhibits an efficiency of 3.5% withJSCof 7.38 mA cm−2,VOCof 0.72 V, and fill factor of 0.66. When various amounts of lithium iodide (LiI) were added to the optimized gel electrolyte, the overall conductivity is observed to decrease. However, the efficiency of the DSSC increases to a maximum value of 3.71% when salt ratio of Pr4NI : LiI is 2 : 1. This cell hasJSC,VOCand fill factor of 7.25 mA cm−2, 0.77 V and 0.67, respectively.

Electrical Property of Methylcellulose/Chitosan-NH4NO3-EC Plasticized Polymer Electrolyte

2015 ◽  
Vol 719-720 ◽  
pp. 82-86 ◽  
Author(s):  
N.L.M. Zazuli ◽  
A.S.A. Khiar
Keyword(s):  
Electrical Property ◽  
Polymer Electrolytes ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Solution Casting ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Dielectric Data ◽  
Solution Casting Technique

Polymer electrolytes blends of methylcellulose (MC)/chitosan-ammonium triflate (NH4CF3SO3) plasticized with Ethylene Carbonate (EC) were prepared by solution-casting technique. The effect on electrical property was investigated by impedance spectroscopy. Sample with 45 wt% of EC exhibit the highest room temperature conductivity of 2.16 × 10-4 Scm-1. Dielectric data were analyzed for the sample with the highest conductivity.

Investigation of Ionic Conduction and Morphological Properties of PMMA-Based Polymer Electrolytes Containing Lithium Iodide

2012 ◽  
Vol 545 ◽  
pp. 264-268
Author(s):  
Nurul Rozullyah Zulkepely ◽  
Siti Rohana Majid ◽  
Zurina Osman
Keyword(s):  
Room Temperature ◽  
Inorganic Salt ◽  
Ionic Conduction ◽  
Ethylene Carbonate ◽  
Morphological Properties ◽  
Lithium Iodide ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Casting Technique ◽  
Solution Casting Technique

In this study, the two systems of polymethylmethacrylate (PMMA) based polymer electrolyte films have been prepared by the solution casting technique. Lithium iodide (LiI) and ethylene carbonate (EC) were used as inorganic salt and plasticizer, respectively. The highest room temperature conductivity for the plasticized system and unplasticized system is 4.42 x 10-5Scm-1and 4.37 x 10-6Scm-1, respectively. The conductivity-temperature dependence studies have been performed on these films in the temperature range of 303 K to 373 K. It can be observed that the logσversus 1000/T plots obey the Arrhenius rule and VTF rule for the plasticized film and unplasticized film, respectively [1-3]. The surface morphology of the plasticized and unplasticized films was observed by using scanning electron microscope (SEM).

Atomistic prediction on the configuration- and temperature-dependent dielectric constant of Be0.25Mg0.75O superlattice as a high-κ dielectric layer

2021 ◽  
Author(s):  
Gyuseung Han ◽  
In Won Yeu ◽  
Kun Hee Ye ◽  
Seung-Cheol Lee ◽  
Cheol Seong Hwang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dft Calculations ◽  
Bond Length ◽  
Dielectric Layer ◽  
Room Temperature ◽  
High Dielectric Constant ◽  
Temperature Dependent ◽  
High Dielectric

Through DFT calculations, a Be0.25Mg0.75O superlattice having long apical Be–O bond length is proposed to have a high bandgap (>7.3 eV) and high dielectric constant (∼18) at room temperature and above.

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