New approach for designing cathode materials for Li-ion batteries

From 01.10.2019 till 30.09.2021
Grant holder: Alexander Soldatov
Responsible: Abdelaziz Mohamed Aboraia

The project is aimed at the synthesis of new cathode materials for lithium-ion and sodium-ion batteries and their preliminary characterization using operando X-ray absorption spectroscopy. The need for new energy storage materials with high charge / discharge rates, energy density and stability requires new approaches to the synthesis and modification of the surface of the cathode material. In this work, metalorganic frameworks will be used as a source of metal and carbon to cover the surface of nanoparticles of high-voltage materials with an olivine structure of the LiMPO4 family, M = Co, Ni, Fe, or their mixture. In particular, the MOF of the ZIF-8 and UiO-66 families will be used, which form a stable conductive carbon shell around the particles of the cathode material after carbonization. Using the same film based on these MOFs as a separator will allow replacing the liquid electrolyte with the electrolyte in the pores and will significantly reduce the effects of a capacity fading at high cycling rates due to a decrease in the rate of degradation. To achieve the best properties of the synthesized material, we will use both traditional hydrothermal approaches and accelerated microwave or sonochemical heating. Theoretical calculations of energy diagrams and electronic structure of the material will be used to select the best candidates for synthesis. Detailed spectroscopic characterization of the synthesized materials including in the operando mode, simultaneously with electrochemical cycling, will be used to correlate the details of the synthesis procedure with the final properties. This technique will be a basis for a closed cycle “synthesis - diagnosis – synthesis” to achieve the desired electrochemical properties of cathode materials in a short time.