cathode

The influence of the structural parameters of lithium battery cathodes on their characteristics has been studied. To explain the results obtained, a macrokinetic model of the electrode was applied, and mathematical simulation of the electrode discharge process was conducted. The nested ball model was used to describe the electrode structure. The data obtained during simulation are in good agreement with the practical results of electrode testing, which confirms the need for targeted optimization of the particle sizes in the cathode.

The electrochemical activity of nickel mesh cathodes activated by electrocatalysts of chemically deposited coatings Ni-S-Fe is investigated. The maximum reduction of overvoltage at current density 6 kA/m² and temperature 70°C is 0.34 V. Comparison of the electrochemical activity of such cathodes with similar cathodes described in the scientific literature revealed that at the same temperature and same overvoltage the current density is twice higher than for the known electrodes.

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.