ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

электрохимический импеданс

Application of the distribution of relaxation times method for the analysis of the polarization resistance of tubular SOFC

Electrode processes occurring in a tubular solid oxide fuel cell were studied using the distribution of relaxation time (DRT) method. The conclusion about the localization of the processes and their nature was made by analyzing the capacitances of the processes and changing their activation energy because of sequential activation of the electrodes. The greatest contribution to the total resistance of the cell was made by cathodic processes at the electrode-contact and electrode-electrolyte boundaries.

Применение метода распределения времён релаксации для анализа поляризационного сопротивления трубчатых ТОТЭ

С помощью метода распределения времён релаксации (DRT) исследованы электродные процессы в трубчатом твердооксидном топливном элементе. Путём анализа емкостей процессов и изменения их энергии активации в результате последовательной активации электродов сделан вывод о локализации процессов и их природе. Наибольший вклад в общее сопротивление ячейки вносят катодные процессы на границах электрод-контакт и электрод-электролит.

Spectral Analysis of Nonharmonic and Polyharmonic Responses of an Electrochemical Object at Impedance Measurements

Possibilities for increasing efficiency of impedance spectral measurements are investigated. It is shown that for determination of linear electrochemical impedance a linearly changing input signal is preferable, and for the quantitative estimation of non-linearity of electrochemical impedance as an input signal it is expedient to use the cosine electric beats. The constructive diagrams of generators of such signals are offered.

Dependence of the electrochemical characteristics of lithium-ion battery in the initial state and after Degradation of the structural parameters of the positive electrode

The study of the internal resistance of the lithium-ion battery designed and manufactured by JSC «Saturn» as the original, and after a long cycle life by pulse chronopotentiometry and electrochemical impedance was carried out. It is shown that the higher the hexagonal ordering of the material and the closer the degree of cation mixing to the optimal value, the less polarization resistance of the battery as original, and after a long cycle life. It was found that the less the original polarization resistance of the battery, the more its cyclic life.

Study of influence of structural parameters of cathode materials of \alpha -NaFeO2 type on electrochemical characteristics of positive electrode of lithium-ion battery

The relationship between the structural parameters of layered materials such as \alpha -NaFeO2 used as positive electrode materials of lithium-ion battery, and electrochemical characteristics were investigated. The dependence of charge transfer resistance on the ratio of cobalt to lithium mole fractions in layered oxides was studied.

Electrochemical Impedance of Lithium-tionyl Chloride Current Sources in the Low-frequency Range

DOI: https://doi.org/10.18500/1608-4039-2018-18-1-20-25

Low-frequency electrochemical impedance spectroscopy in the frequency range from 12.5 to 5 ? 10?4 Hz was used to study changes in standard lithium-thionyl chloride cells during their discharge. Analysis of possible equivalent circuits describing the experimental data shows that the behavior of the cells discharged to 70% can be simulated by finite diffusion impedance in this frequency range.