RSCF №24-23-00224

(2024—2026)

Annotation

The project is aimed at solving the urgent problem of creating new cathode materials for magnesium-ion batteries based on layered vanadium oxides with a tunable structure of the interlayer space in order to obtain cathodes with enhanced functional characteristics. The fundamental problems addressed in the project include:

• directed chemical design of new electrode materials for magnesium-ion batteries with improved functional properties
• development of physical and chemical principles of surface modification of electrode materials with electron- and ion-conducting polymers.

Expected results

Materials based on vanadium oxides doped with aluminum ions, which act as interlayer pillars that set the size of the layered structure, will be obtained. This promotes the transport of relatively large magnesium ions and ensures the stability of the oxide structure. Optimization of the composition and structure will be accomplished by varying the concentration of modifier metal ions during synthesis. An additional way to improve the conductivity of the material and increase its stability will be the introduction of conductive polymer into the electrode material composition both through surface coating of grains by means of oxidative polymerization of monomer chemical modification and intercalation of polymer molecules into the layered oxide structure in the course of hydrothermal synthesis. To reduce polarizing effects from high charge density of magnesium ions, it is planned to test different electrolytes with the introduction of additives for charge shielding. The project involves a systematic study of electrochemical and structural-chemical properties of doped vanadium-oxide cathode materials, establishment of factors contributing to the increase of specific capacitance and stability of cyclic life of cathode materials.