Ilkiv V. Influence of synthesis conditions on the structure of SiO2/Al2O3/TiO2 nanocomposites and on the charge capacity of lithium sources of current with cathodes based on them.

The morphological, structural and electronic-structural properties of Al2O3+SiO2, Al2O3+ТiO2 nanoscale mixtures before and after the shock-vibration treatment and pyrogenic Al2O3/SiO2 composites were investigated in the thesis by the methods of scanning and transmission electron microscopy, X-ray diffraction and emission spectroscopy. The dependence of the charge capacities of LSC with cathodes based on Al2O3+SiO2 composites, obtained by different methods, from the peculiarities of their electronic structure formation was investigated by the method of galvanostatic cycling. As a result of shock-vibration treatment of Al2O3+SiO2 mixtures energy redistribution of the valence electrons of nanocomposites due to the emergence of interatomic interaction between the surface atoms of nanoparticles was discovered. It is established that interatomic interaction between the surface nanoparticles is mainly the result of the increase of Op-states settlement caused by Op-orbitals overlapping that leads to the increase of charge capacity of LSC with cathode based on them. However, only Opпі-binding states settlement is accompanied by the increase of charge capacity at each subsequent cycle, while the settlement of high energetic Op*-anti-binding states leads to the increase of recombination ability of the ions of lithium and to the formation of LiO oxide (passivating) film on the surface of LSC cathode material that prevents its subsequent cycling.