Volume 25, Nº 2 (2025)
Articles
On degradation mechanism of lithium-sulfur batteries
Resumo
Using the method of normalized galvanostatic curves, as well as taking into account the changes in the half-charge and half-discharge potentials of an electrode, the latter based on a sulfur composite with reduced graphene oxide, it was established that the main reason for electrode degradation during cycling was the loss of active material (due to the shuttle transfer of polysulfides and sulfur from the positive electrode to the negative lithium one).
Electrochemical Energetics. 2025;25(2):61-67
61-67
Hydrolytic and oxidative stability of sulfide solid electrolytes
Resumo
The hydrolytic and oxidative stability of sulfide solid electrolytes Li7P3S11 and Li3PS4 at different humidity of the gas environment (air and argon) was studied. It was found that increasing the air humidity the oxidation rate of sulfide solid electrolytes also increases. It was shown that the oxidation rate of sulfide solid electrolytes depends on their composition. Thus, Li7P3S11 electrolyte has higher oxidation stability in the humid air compared to Li3PS4. Lithium sulfate is the main oxidation product of sulfide solid electrolytes.
Electrochemical Energetics. 2025;25(2):68-73
68-73
Influence of composition of cathodic deposition electrolyte on morphology and capacity properties of MnO2 film
Resumo
Manganese oxide was obtained by cathodic electrochemical deposition from the electrolyte solutions adding sodium nitrate or sulfate. The structural characteristics and the elemental composition of the MnO2 samples were studied by energy dispersive microanalysis, IR spectroscopy, and transmission electron microscopy. The electrochemical characteristics of the electrodes were determined by cyclic voltammetry, galvanostatic charge-discharge and impedance spectroscopy in 0.5M Na2SO4 solution. The dependence of the structural and capacitive properties of the MnO2 electrodes on the anion nature in the electrolyte for electrochemical deposition was determined. High capacitance characteristics were obtained for the MnO2 sample deposited from the electrolyte adding sodium sulfate. Its specific capacity was 215 F/g at the scanning speed of 5 mV/s.
Electrochemical Energetics. 2025;25(2):74-86
74-86
Galvanostatic and potentiostatic reduction of multilayer graphene oxide in alkaline electrolyte
Resumo
The results of the study of electrochemical reduction of multilayer graphene oxide in galvanostatic and potentiostatic modes are presented, the possibility of using the alkaline electrolyte KOH with the concentration of 0.01 M is shown. The identification of electrochemically reduced graphene oxide was carried out by XRD analysis, IR and Raman spectroscopy. Based on the analysis of Raman spectra, the increase in the total defectiveness,the decrease in the concentration of oxygen-containing groups and the decrease in the crystallite size of graphene oxide were determined.
Electrochemical Energetics. 2025;25(2):87-94
87-94
Production and electrochemical properties of electrode material based on nitrogen-doped carbon nanotubes for hybrid supercapacitors
Resumo
A method for producing nitrogen-doped carbon nanotubes was tested. Polyaniline, chemically synthesized on the surface of nanotubes with subsequent carbonization, was used as a source of nitrogen. The electrochemical characteristics of the electrodes based on the obtained carbon material for the hybrid supercapacitors with the acidic electrolyte were studied. It was shown that nitrogen doping of carbon nanotubes increases the capacitive characteristics of the electrodes.
Electrochemical Energetics. 2025;25(2):95-111
95-111