A. A. Raskovalov

Cathode half-cell of all-solid-state battery, modified with LiPO3 glass

Electrochemical Methods were used to study the Pt|Li0.9CoO2|(Li7La3Zr2O12 + LiPO3 glass)|Li0.9CoO2|Pt symmetric cell simulating the operation of the cathode of a solid-state power cell. It was shown that the glassy electrolyte serves in the system for organizing an ionic contact between the solid electrolyte and the cathode material. The current-breaking method and impedance spectroscopy demonstrated that the resistance of the cell is about 600 Ω at a temperature of 325°C. The overvoltage is 88 mV at a current density of 13 µA cm–2. The plot describing the dependence of the current density on voltage is of the activation type, i.e., the main contribution to the polarization comes from the activation component.

All-solid-state battery Li–Ga–Ag | Li7La3Zr2O12 + Li2O–Y2O3–SiO2 | Li2O–V2O5–B2O3

Electrochemical cell Li–Ga–Ag | Li7La3Zr2O12 + 5 wt % 40.2Li2O·5.7Y2O3·54.1SiO2 glass | 25Li2O·30B2O3·45V2O5 glass ceramic was studied. The glassy materials 40.2Li2O·5.7Y2O3·54.1SiO2 and 25Li2O·30B2O3·45V2O5 were produced by melt quenching. The use of a glassy cathode based on vanadium oxide enabled a close contact between the cathode and the solid electrolyte. At a temperature of 280°C, the electrochemical cell under study can be charged to 3.33 V. It was found that the deintercalation of lithium is hindered in the course of charging and discharge.

Optimization of the preparation conditions of Li 7 La 3 Zr 2 O 12 ceramic electrolyte for lithium power cells

Results of a study of how the density and electrical conductivity of a Li7La3Zr2O12 ceramic depends on the sintering temperature were used to determine the optimal conditions for formation of the system under study as a solid electrolyte with a conductivity of 3.7 × 10−2 S cm−1 at 185°C for electrochemical devices.

Influence of cerium oxide on properties of glass–ceramic sealants for solid oxide fuel cells

The influence of the cerium oxide concentration on the properties of glasses and glass ceramics of the SiO2–Al2O3–CaO–Na2O–MgO–K2O–B2O3–CeO2 system as potential adhesive and sealing materials for solid oxide fuel cells was studied. According to the data of differential scanning calorimetry, variation of the CeO2 concentration does not appreciably influence the glass transition and crystallization temperatures of glasses. As the cerium oxide concentration is increased, the linear thermal expansion coefficient increases for the glasses but decreases for the partially crystalline samples. The gluing temperature of the glass sealants prepared allows their use for joining YSZ solid electrolytes with interconnectors of Crofer22APU type in solid oxide fuel cells..