electrolyte system
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Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 170
Author(s):  
Balen K. Faris ◽  
Ary A. Hassan ◽  
Shujahadeen B. Aziz ◽  
Mohamad A. Brza ◽  
Aziz M. Abdullah ◽  
...  

The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at the XRD pattern at 40 and 50 wt.% of NaBr salt. The electrical impedance spectroscopy (EIS) study illustrates that the loading of NaBr increases the electrolyte conductivity at room temperature. The DC conductivity of 6.71 × 10−6 S/cm is obtained for the highest conducting electrolyte. The EIS data are fitted with the electrical equivalent circuit (EEC) to determine the impedance parameters of each film. The EEC modeling helps determine the circuit elements, which is decisive from the engineering perspective. The DC conductivity tendency is further established by dielectric analysis. The EIS spectra analysis shows a decrease in bulk resistance, demonstrating free ion carriers and conductivity boost. The dielectric property and relaxation time confirmed the non-Debye behavior of the electrolyte system. An incomplete semicircle further confirms this behavior model in the Argand plot. The distribution of relaxation times is related to the presence of conducting ions in an amorphous structure. Dielectric properties are improved with the addition of NaBr salt. A high value of a dielectric constant is seen at the low frequency region.


Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4127
Author(s):  
Gregory Rollo-Walker ◽  
Nino Malic ◽  
Xiaoen Wang ◽  
John Chiefari ◽  
Maria Forsyth

Polymer electrolytes continue to offer the opportunity for safer, high-performing next-generation battery technology. The benefits of a polymeric electrolyte system lie in its ease of processing and flexibility, while ion transport and mechanical strength have been highlighted for improvement. This report discusses how factors, specifically the chemistry and structure of the polymers, have driven the progression of these materials from the early days of PEO. The introduction of ionic polymers has led to advances in ionic conductivity while the use of block copolymers has also increased the mechanical properties and provided more flexibility in solid polymer electrolyte development. The combination of these two, ionic block copolymer materials, are still in their early stages but offer exciting possibilities for the future of this field.


Author(s):  
Atiek Rostika Noviyanti ◽  
Yoga Trianzar Malik ◽  
Iman Rahayu ◽  
Diana Rakhmawaty Eddy ◽  
Uji Pratomo

Abstract The electrochemical properties of La9.33Si6O26(LSO)-La0.8Sr0.2Ga0.8Mg0.2O2.55(LSGM) electrolyte composites have been evaluated over NiO and La0.1Ca0.9MnO3 (LCM) electrodes using symmetric and asymmetrical cells of NiO/LSO-LSGM/NiO and NiO/LSO-LSGM/LCM, respectively. The Nyquist plot obtained from this study suggested that the new electrolyte system exhibits excellent performance over the NiO and LCM electrodes and shows an ideal Randel cell electrical circuit characteristic in both NiO/LSO-LSGM/NiO and NiO/LSO-LSGM/LCM cells. The area-specific resistance (ASR) and, the activation energy (Ea) of NiO/LSO-LSGM/NiO from the Arrhenius plot are lower than the NiO/LSO-LSGM/LCM, which is 0.30 Ω cm-2 and of 0.74 eV versus 0.40 Ω cm-2 with Ea of 0.76 eV, respectively.


Author(s):  
Xiaoshuai Yuan ◽  
Chin Feng Ng ◽  
Nikolic Heather ◽  
Kunlei Liu

A thermodynamically consistent model for the carbon dioxide (CO2) absorption in aqueous alkanolamine system is of great importance in the research and development of a CO2 capture process. To facilitate the development of thermodynamic models, linear Gibbs free energy, enthalpy, and heat capacity relationships using well-known amines as reference are used to correlate the standard reference state properties of ionic species with those of molecular species in the electrolyte system, which has been approved to provide a reliable and consistent way to estimate required parameters when there is minimal or no appropriate experimental data available. The proposed relationships have been applied to the development of an electrolyte Non-Random Two Liquid (NRTL) activity coefficient model for CO2 absorption in aqueous 1-amino-2-propanol (A2P) solution, as an example to demonstration the methodology. With limited vapor-liquid equilibrium data and other thermodynamic properties, the parameters in the electrolyte NRTL model are identified with good accuracy.


2021 ◽  
Vol 1 (1) ◽  
pp. 1-17
Author(s):  
Siti Mariah Mohd Yasin ◽  
Mohd Rafie Johan

This work represents thermal study of PEO-based polymer electrolyte films that were prepared by the solution cast technique. The melting temperature Tm, glass transition temperature Tg and degree of crystallinity χc were measured by diffraction scanning calorimetry (DSC). Thermogravimetric (TGA) was used to determine the initial and final degradation temperatures. The structural was also performed to characterize the vibrational wavelength and phase characteristic (crystalline/amorphous). While the morphological study was emphasized to examine the features appearance for pure polymer electrolyte system as well as after addition salt, plasticizer and filler. The zirconium oxide particles were measured after the milling process by using the transmission electron microscopy (TEM), and the particles obtained in the range of 9 – 54 nanometer size.


Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4047
Author(s):  
Valeriia Baranauskaite ◽  
Maria Belysheva ◽  
Olga Pestova ◽  
Yuri Anufrikov ◽  
Mikhail Skripkin ◽  
...  

Thermodynamic data on the properties of the water-based electrolyte systems are very valuable for fundamental physical chemistry and for industrial applications. The missing data both on the dilution and dissolution enthalpies for the ternary CsCl−MgCl2−H2O mixed electrolyte system were investigated by means of the calorimetry method. The dilution calorimetry was performed at 298 K for the set of solutions from diluted to concentrated at constant ratio Cs+/Mg2+=1.8. The relative partial molar enthalpies, ideal, total, and excess ones were calculated. By means of the dissolution calorimetry, the standard enthalpies of formation, the enthalpies, and entropies for the double salt formation from simple salts were evaluated. The results obtained indicate that entropy as the major factor affecting the formation of the joint compound, both in the liquid and solid phases. These data can be implemented in thermodynamic databases and allow for accurate thermodynamic calculations for the salts extraction from natural water sources and for its possible application as thermochemical energy storage.


Author(s):  
Xiaofei Hu ◽  
Edward Matios ◽  
Yiwen Zhang ◽  
Chuanlong Wang ◽  
Jianmin Luo ◽  
...  

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