Kotsyubynsky V. Synthesis, structure and electrochemical properties of oxide nanomaterials.

For the first time complete experimental study of the correlation between obtaining conditions and structural and morphological characteristics of nanodispersed oxides of titanium, silicon, tin, iron and magnesium hydroxide was done and the impact of these characteristics on the kinetics of the discharge process of lithium power sources with the cathode on the basis of synthesized materials was studied in the dissertation work. A phenomenological model of TiCl4 hydrolysis was constructed; it was shown that changing the type of hydrolyzing agent of acidity regulator, pH level and temperature of the reaction medium, the presence and type of impurities facilitate obtaining of TiO2 with given phase composition, degree of hydration, surface morphology and degree of particles agglomeration. The conditions of controlling the phase composition and morphology of nanocomposites TiO2/Fe2О3, TiO2 /V2O5, TiO2 /Сr2O3, TiO2 /MnO2 at liquid-phase synthesis was found out. Phasic nature was explained and kinetics of lithium power sources discharging with the cathode on the basis of the obtained by liquid-phase and pyrogenic methods was traced back. The mechanism of influence of adsorbed H2O and chemisorbed hydroxyl process LPS discharge with the cathode on the basis of hydrated oxides was revealed. Titanium and silicon oxides and composites ТіО2/SiO2, ТіО2/Al2O3, ТіО2/SiO2/Al2O3 were obtained by pyrogenic synthesis and investigated. It is proved that a weak agglomeration of pyrogenic oxide is a prerequisite for the formation on their surfaces sorption layers of lithium ions. For the first time intercalation of Li+ ions in the obtained by hydrothermal method alfa-quartz was studied and a place of lithium ions localization in the structure was found. The mechanisms of Mg(OH)2 nanoparticles formation at hydrolysis of МgСl2 6H2O was found out and this material as the basis of cathode composition of LPS was tested. The comparative analysis of the effectiveness of LPS nanodispersed SnO2, obtained by sol-gel and pyrogenic methods was carried out. A way to obtain nanodispersed Fe2O3 by thermal decomposition of iron citrate with control of the phase composition and morphology of the obtained material.