scholarly journals Ionic Conductivity of Chitosan-Lithium Electrolyte in Biodegradable Battery Cell

2020 ◽  
Vol 20 (3) ◽  
pp. 655
Author(s):  
Ali Benouar ◽  
Mohammed Reda Ahmed Bacha
Keyword(s):  
Ionic Conductivity ◽  
Lithium Battery ◽  
Empirical Equation ◽  
Ionic Association ◽  
Temperature Dependency ◽  
Battery Cell ◽  
Solvent Interactions ◽  
Temperature Range ◽  
Electrical Conductivities

The electrical conductivities of salts (LiCl, LiOH) in chitosan as an electrolyte in biodegradable batteries have been measured at the concentration range 10–100 mol m–3 in the temperature range 278–308 K. The data were interpreted in terms of ion–ion and ion–solvent interactions using the Fuoss paired ion. The fitting of Fuoss’ equation of 1978 to these data led us to an estimate of the ionic association by computing the conductimetric pairing constants. In order to optimize the use of the electrolyte in the clean lithium battery, the temperature dependency of conductivity will be studied using Arrhenius empirical equation. This equation was applied successfully in the temperature range used in this study.

Conductimetric studies of ionic association of tetraalkylammonium halides in iso-propanol + water mixtures at 25 °C. Part II.

1988 ◽  
Vol 66 (7) ◽  
pp. 1720-1727 ◽  
Author(s):  
Auaz Ahmad Ansari ◽  
M. R. Islam
Keyword(s):  
Dielectric Constant ◽  
Association Constant ◽  
Ionic Association ◽  
Size Parameter ◽  
Solvent Interactions ◽  
Tetraalkylammonium Ions ◽  
Conductance Data ◽  
Electrical Conductivities ◽  
Ion Size ◽  
Tetraalkylammonium Halides

Electrical conductivities of Me4NBr, Et4NBr, Pr4NBr, Bu4NBr, and Bu4PBr have been measured in isopropanol + water (2-PrOH + H2O) mixtures covering the approximate range of dielectric constant (71.40 ≥ D ≥ 19.40) at 25 °C. The conductance data have been analysed by using the Fuoss-1978 (F78) conductance equation and the results compared with those obtained from the Fuoss–Onsager–Skinner (FOS) equation. The values of the limiting equivalent conductance, Λ0, the association constant, KA, and the distance of ion-size parameter [Formula: see text] are computed from these data. A better fit of the conductance data was provided by the F78 equation. Ion–solvent interactions and effective sizes of tetraalkylammonium ions are also discussed in order to understand the magnitude of the ionic association. The overall association behaviour of these salts has been found to increase with decrease in dielectric constant of the medium.

pH of N,N-Dimethylformamide in [Bmim][BF4] and [Bmim][PF6] Ionic Liquids

2011 ◽  
Vol 393-395 ◽  
pp. 1322-1327
Author(s):  
Bin Guo ◽  
Liang Gao ◽  
Er Hong Duan ◽  
Ai Ling Ren ◽  
Jian Zhong Chen
Keyword(s):  
Ionic Liquids ◽  
Binary Mixtures ◽  
Mole Fraction ◽  
Empirical Equation ◽  
Ph Value ◽  
Temperature Dependency ◽  
Temperature Range ◽  
Ph Values

The pH value of binary mixtures containing N,N-dimethylformamide (DMF) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) ionic liquids over the range of N,N-dimethylformamide mole fraction from (0.1 to 0.9) and temperature range from (293.15 to 338.15) K were measured. The range of pH values of N,N-dimethylformamide and [Bmim][BF4] and [Bmim][PF6] were from (3.42 to 6.50) and (6.98 to 9.74), respectively. Comparison showed that the pH of N,N-dimethylformamide in the two ionic liquids was in sequence: [Bmim][BF4] < [Bmim][PF6] at the same conditions. The temperature dependency of the pH value was correlated using an empirical equation. The correlations gave satisfactory results.

pH of Toluene in [Bmim][BF4] and [Bmim][PF6] Ionic Liquids

2011 ◽  
Vol 393-395 ◽  
pp. 1328-1333
Author(s):  
Ai Ling Ren ◽  
Dan Dan Zhang ◽  
Er Hong Duan ◽  
Bin Guo ◽  
Jian Zhong Chen
Keyword(s):  
Ionic Liquids ◽  
Binary Mixtures ◽  
Mole Fraction ◽  
Empirical Equation ◽  
Ph Value ◽  
Temperature Dependency ◽  
Temperature Range ◽  
Ph Values

The pH value of binary mixtures containing toluene and 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) ionic liquids over the range of ionic liquids mole fraction (xIL) from (1.0 to 0.60) and temperature range from (293.15 to 340.65) K were measured. The range of the pH values of toluene and [Bmim][BF4] and [Bmim][PF6] were from (3.16 to 4.63) and (5.57 to 7.55), respectively. Comparison showed that the pH of toluene in the two ionic liquids was in sequence: [Bmim][BF4] < [Bmim][PF6]. The temperature dependency of the pH value was correlated using an empirical equation. The correlations gave satisfactory results.

scholarly journals Upscaling of LATP synthesis: Stoichiometric screening of phase purity and microstructure to ionic conductivity maps

Ionics ◽  
2021 ◽  
Vol 27 (5) ◽  
pp. 2017-2025
Author(s):  
Nikolas Schiffmann ◽  
Ethel C. Bucharsky ◽  
Karl G. Schell ◽  
Charlotte A. Fritsch ◽  
Michael Knapp ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Sol Gel ◽  
Ion Conductivity ◽  
Process Window ◽  
Lithium Aluminum ◽  
Potential Candidate ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Battery Cell ◽  
Li Ion

AbstractLithium aluminum titanium phosphate (LATP) is known to have a high Li-ion conductivity and is therefore a potential candidate as a solid electrolyte. Via sol-gel route, it is already possible to prepare the material at laboratory scale in high purity and with a maximum Li-ion conductivity in the order of 1·10−3 s/cm at room temperature. However, for potential use in a commercial, battery-cell upscaling of the synthesis is required. As a first step towards this goal, we investigated whether the sol-gel route is tolerant against possible deviations in the concentration of the precursors. In order to establish a possible process window for sintering, the temperature interval from 800 °C to 1100 °C and holding times of 10 to 480 min were evaluated. The resulting phase compositions and crystal structures were examined by X-ray diffraction. Impedance spectroscopy was performed to determine the electrical properties. The microstructure of sintered pellets was analyzed by scanning electron microscopy and correlated to both density and ionic conductivity. It is shown that the initial concentration of the precursors strongly influences the formation of secondary phases like AlPO4 and LiTiOPO4, which in turn have an influence on ionic conductivity, densification behavior, and microstructure evolution.

scholarly journals Effect of Temperature, Pressure, and Chemical Composition on the Electrical Conductivity of Schist: Implications for Electrical Structures under the Tibetan Plateau

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 961 ◽  
Author(s):  
Wenqing Sun ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Changcai Liu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
High Pressures ◽  
High Conductivity ◽  
Effect Of Temperature ◽  
The Tibetan Plateau ◽  
Temperature Range ◽  
Electrical Conductivities ◽  
Conductivity Anomalies ◽  
Lower Temperature Range ◽  
Lower Temperature

The experimental study on the electrical conductivities of schists with various contents of alkali ions (CA = K2O + Na2O = 3.94, 5.17, and 5.78 wt.%) were performed at high temperatures (623–1073 K) and high pressures (0.5–2.5 GPa). Experimental results indicated that the conductivities of schist markedly increased with the rise of temperature. Pressure influence on the conductivities of schist was extremely weak at the entire range of experimental temperatures. Alkali ion content has a significant influence on the conductivities of the schist samples in a lower temperature range (623–773 K), and the influence gradually decreases with increasing temperature in a higher temperature range (823–1073 K). In addition, the activation enthalpies for the conductivities of three schist samples were fitted as being 44.16–61.44 kJ/mol. Based on the activation enthalpies and previous studies, impurity alkaline ions (K+ and Na+) were proposed as the charge carriers of schist. Furthermore, electrical conductivities of schist (10−3.5–10−1.5 S/m) were lower than those of high-conductivity layers under the Tibetan Plateau (10−1–100 S/m). It was implied that the presence of schist cannot cause the high-conductivity anomalies in the middle to lower crust beneath the Tibetan Plateau.

scholarly journals On the well-posedness of a multiscale mathematical model for Lithium-ion batteries

2018 ◽  
Vol 8 (1) ◽  
pp. 1132-1157 ◽  
Author(s):  
J. Ildefonso Díaz ◽  
David Gómez-Castro ◽  
Angel M. Ramos
Keyword(s):  
Lithium Battery ◽  
Lithium Concentration ◽  
Nonlinear Partial Differential Equations ◽  
Lithium Ion ◽  
Mathematical Treatment ◽  
Well Posedness ◽  
Battery Cell ◽  
Rigorous Results ◽  
Multiscale Mathematical Model ◽  
Short Time

Abstract We consider the mathematical treatment of a system of nonlinear partial differential equations based on a model, proposed in 1972 by J. Newman, in which the coupling between the Lithium concentration, the phase potentials and temperature in the electrodes and the electrolyte of a Lithium battery cell is considered. After introducing some functional spaces well-adapted to our framework, we obtain some rigorous results showing the well-posedness of the system, first for some short time and then, by considering some hypothesis on the nonlinearities, globally in time. As far as we know, this is the first result in the literature proving existence in time of the full Newman model, which follows previous results by the third author in 2016 regarding a simplified case.

Ionic Liquid Incorporated Metal Organic Framework for High Ionic Conductivity over Extended Temperature Range

2019 ◽  
Vol 7 (8) ◽  
pp. 7892-7899 ◽  
Author(s):  
Qiuxia Xu ◽  
Xiangping Zhang ◽  
Shaojuan Zeng ◽  
Lu Bai ◽  
Suojiang Zhang
Keyword(s):  
Ionic Liquid ◽  
Ionic Conductivity ◽  
Metal Organic Framework ◽  
High Ionic Conductivity ◽  
Temperature Range ◽  
Metal Organic ◽  
Organic Framework

Extended D.C. Electrical Transport Measurements on the Mixed Conductor Cu3Cs2

1997 ◽  
Vol 500 ◽  
Author(s):  
P. K. Lemaire ◽  
J. Benoit ◽  
R. Speel
Keyword(s):  
Ionic Conductivity ◽  
Electrical Transport ◽  
Electronic Conductivity ◽  
Ionic Transport ◽  
Mixed Conductor ◽  
Chemical Diffusion Coefficient ◽  
Mixed Conductors ◽  
Voltage Versus ◽  
Temperature Range ◽  
Transport Measurements

ABSTRACTD.C. electrical transport measurements have been done over the temperature range 200 K. to 450 K on the mixed conductor Cu3.0CS2 This work extends the original work done on CuxCS2 over the temperature range 260 K to 350 K. Above 220 K, the voltage versus time curves follow the Yokota model for mixed conductors. Below 220K, the voltage versus time curves were practically constant, suggesting very little ionic transport below this temperature, and an electronic conductivity of the order of 10−5 (Ω cm)−1 at 200 K. At ambient temperatures, the ionic conductivity and electronic conductivity were both of the order of 10−3 (Ω cm)−1, and the chemical diffusion coefficient found to be of the order of 10−6 cm2s−1, in agreement with earlier work on Cu3CS2. Above 220 K, the ionic conductivity versus temperature plots were of the Arrhenius form with an activation energy of about 0.36 eV. The jump time and residence time were estimated to be of the order of 10−12s and 10−6s respectively, confirming hopping as the mode of ionic transport. The electronic conductivity versus temperature plot confirmed thermal activation as the mode of electronic transport. The results suggest CuxCS2 to be very stable and the Yokota model, with very little modification, to be very reliable for the analysis of these mixed conductors.

Enhanced ionic conductivity in borate ester plasticized Polyacrylonitrile electrolytes for lithium battery application

2015 ◽  
Vol 164 ◽  
pp. 108-113 ◽  
Author(s):  
Mehmet Kaynak ◽  
Abdulmalik Yusuf ◽  
Hamide Aydın ◽  
Mehmet Uğur Taşkıran ◽  
Ayhan Bozkurt
Keyword(s):  
Ionic Conductivity ◽  
Lithium Battery ◽  
Borate Ester ◽  
Battery Application
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