Vol 25, No 1 (2025)
Articles
3-9
Electrochemical characteristics of lithium-sulfur pouch cells. Effect of compression force of electrode modules
Abstract
The effect of the electrode sizes, the cell design and the compression force of the electrode modules on the impedance and discharge characteristics of lithium-sulfur cells was studied. It was shown that Swagelok and pouch cells with identical electrodes have different electrochemical characteristics – charge transfer resistance, discharge capacity and cycling duration. It was found that the discharge capacity at the first cycle of Swagelok and pouch cells differs by 20% approximately. The capacity of pouch cells decreases faster during cycling. The cycling of pouch cells in a compressed state (similar to Swagelok cells) does not improve the electrochemical characteristics of pouch cells.
Electrochemical Energetics. 2025;25(1):10-22
10-22
Na2Ti3O7 and α-Fe2O3-based hybrid nanomaterial for the negative electrode of sodium-ion batteries
Abstract
Sodium trititanate, Na2Ti3O7, is considered to be a promising material for the negative electrode of reliable sodium-ion batteries. The advantages of Na2Ti3O7 include suitable electrode potential and cycling stability. However, this material is characterized by the limited specific capacity and low electronic conductivity. The current work is devoted to modification of Na2Ti3O7 by combining it with the high-capacity α-Fe2O3 phase. The structure, the composition, the morphological features, the electronic and the electrochemical properties of the obtained Na2Ti3O7–α-Fe2O3-based hybrid nanomaterial were studied in the work.
Electrochemical Energetics. 2025;25(1):23-32
23-32
Impedance spectroscopy of hollandite-like ceramic composite material of K2O-MnO-Cr2O3-TiO2 system
Abstract
The electrochemical properties of a ceramic composite material in which a hollandite-like potassiumchromium titanate solid solution is presented as the main phase were studied using impedance spectroscopy. The dependences of the conductivity of the obtained composites on temperature in the range from 250 to 800°C were studied. The activation energies of volumetric, intergranular and grain volume conductivity were determined. The phase composition of the material and the crystallographic structures of individual phases were also established.
Electrochemical Energetics. 2025;25(1):33-44
33-44
45-47
48-50