Vol 23, No 2 (2023)
Articles
57-79
Modernization of the flash point tester PE-TVZ for determining fire safety of electrolyte systems of energy-intensive batteries
Abstract
The flash point tester PE-TVZ was modernized. The sample volume was reduced from 70 to 5 ml. Mixing of the condensed and gas-vapor phases was done simultaneously. The mercury thermometer was replaced by an electronic one. The correctness of the flash point measurement by the modernized device was tested on the samples with the flash point in the range of 25–170°C. The correlation coefficient between the measured flash points of the samples using the flash point tester PE-TVZ and the modernized one was 99.6%, the discrepancy between the measured values not exceeding 1°C. Modernization of the tester made it possible to reduce the amount of samples used by a factor of 14 while maintaining the accuracy of measuring the flash point.
Electrochemical Energetics. 2023;23(2):80-86
80-86
Influence of gallium additives on the anodic behavior of the conductive aluminum alloy E-AlMgSi (aldrey) in NaCl electrolyte medium
Abstract
The work presents the results of the study of the anodic behavior of aluminum alloy E-AlMgSi (aldrey) with gallium, in the medium of 0.03; 0.3 и 3.0% NaCl electrolyte. The corrosion-electrochemical study of alloys was carried out using the potentiostatic method. It was shown that doping E-AlMgSi (aldrey) with gallium increased its corrosion resistance by 20%. The main electrochemical potentials of the alloys when doping with gallium are shifted to the positive range of values, and at the concentration of sodium chloride to the negative values of the ordinate axis.
Electrochemical Energetics. 2023;23(2):87-94
87-94
Influence of additives of carbon nanotubes and graphene to the active mass of the negative electrode of the lead-acid battery on its electrochemical characteristics
Abstract
The electrochemical characteristics of the negative electrodes of the lead-acid battery with additives of carbon nanotubes and graphene were studied. It was shown that the highest values of the capacitive characteristics of the electrodes were obtained by adding carbon nanotubes to the negative active mass. The processes occurring on the negative electrode were studied by the method of impedance spectroscopy. Applying simulation, an equivalent electrical circuit was obtained, which adequately approximated the obtained frequency dependences. The elements of the proposed equivalent circuit were calculated. It was found that the injection of carbon additives increases the resistance R3 related to the porous structure of the electrodes.
Electrochemical Energetics. 2023;23(2):95-106
95-106