Lisovskyi R. Synthesis and physicochemical properties of electrode materials for hybrid electrochemical systems.

The dissertation presents a complex study of the processes of synthesis and establishing of patterns of compatible functioning of the electrode materials of hybrid electrochemical systems. Methods of obtaining carbon materials from raw materials of organic origin and lithium-containing spinels have been optimized. The influence of synthesis conditions on the parameters of hybrid electrochemical systems based on the obtained carbon materials and lithium-containing spinels has been established.The structural, morphological and electrochemical properties of carbon materials when used as electrodes for electrochemical capacitors have been investigated. The contribution of the pseudocapacitance and the electric double layer capacitance to the total specific capacitance of the electrode materials in a number of electrolyte solutions has been established. The use and application of lithium-containing iron spinels as the active material of the faradaic electrode in hybrid electrochemical systems has been proposed and tested. The effect of iron substitution on the structural and conductive properties of the synthesized materials has been investigated. The models of hybrid electrochemical capacitors in which the obtained carbon materials are used for polarized electrode and the synthesized Li1+zMn2-zO4 (z = 0.0-0.5) and LiMn2-zFezO4 (z = 0.05, 0.2, 0.5, 1) spinels are used for faradaic electrode have been formed. The specific capacitive and energy parameters of these systems have been calculated. Optimal conditions for compatible functioning of electrodes of different mechanisms of charge accumulation have been established.