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Poly(vinyl alcohol) Based Polymer Gel Electrolytes: Investigation on Their Conductivity and Characterization

100%
Çavuş S., Durgun E.
|
EN
Polymer gel electrolytes were prepared using poly(vinyl alcohol) (PVA) as polymer matrix. 1-methyl-2-pyrrolidone (NMP) and γ -butyrolactone (GBL) were preferred as the organic solvents. The alkali metal iodide salt (KI) and iodine (I₂) were used as the redox couple. Liquid electrolytes with different concentrations of KI were prepared by dissolving iodide salt/iodine in the binary NMP:GBL (volume ratio 7:3) solvent mixture. PVA was added into the liquid electrolytes and then the resulting mixture was stirred at 110°C for 1 h. Gel form was obtained at room temperature. The highest ionic conductivity at room temperature is 8.41 mS/cm. The temperature dependence of ionic conductivity with respect to the all concentration of KI shows the Arrhenius behaviour. Characterizations of polymer gel electrolytes were performed using the Fourier transform infrared, thermal gravimetric analysis, and differential scanning calorimetry techniques.
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Electrical Conductivity, Viscosity and Thermal Properties of TEGDME-Based Composite Electrolytes for Lithium-Air Batteries

44%
Kartal M., Alp A., Akbulut H.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
816-818
EN
Some important properties of the electrolytes used in Li-air batteries were investigated. Electrolyte composed of a solution of 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) was reinforced with SiO₂, Al₂O₃, poly(ethylene) oxide (PEO) and tris (pentafluorophenyl) borane (TPFPB) additives. The effects of these reinforcements on conductivity, viscosity and thermal stability were investigated. Electrical conductivity tests were carried out using a multiparameter meter. Viscosity tests were performed in a viscometer using tuning-fork vibration method. Thermal stability of the electrolytes was tested by both TG and DSC.
3
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The Effect of Inorganic Nano Powder Additives in TEGDME for Lithium Air Batteries

44%
Kartal M., Uysal M., Cetinkaya T., Alp A., Akbulut H.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1016-1018
EN
SiO₂ and Al₂O₃ nano fillers were added to an electrolyte composed of a solution 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) and the effects of these nano powders on capacity and cycling performances were investigated. Galvanostatic charge/discharge (GC) measurements were performed in the assembled Li-air cells by using the nanocomposite electrolytes. The discharge capacities of these cells were cyclically tested by a battery tester at a constant current in the voltage range between 2.15 V and 4.25 V. Discharge products of nanocomposite electrolytes were characterized by SEM and XRD spectroscopies. The electrochemical results demonstrated that Al₂O₃ reinforced electrolyte showed higher discharge capacity and cyclability than those of SiO₂ reinforced electrolyte.
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