Kirsanova I. Thin-layer oxide- and sulfide-electrodes in lithium power sources

The object of study-electrode processes in thin-layer electrochemically synthesized molybdenum oxides, sulphides, and their compositions in a lithium battery. Purpose of investigation-establishment of the laws of the charge transfer processes across the boundary electrode/electrolyte interface, mass transfer in the bulk of the electrode and the migration/diffusion in the electrolyte during the reaction of the synthesized Mo-compounds with Li to improve the efficiency of energy conversion power source. Research methods-X-ray diffraction and thermal analysis; IR-spectroscopy; profilometry method, atomic force microscopy; galvanostatic cycling, cyclic voltammetry, electrochemical impedance spectroscopy, the potential relaxation method after the current is switched off. Theoretical and practical results-It has been established that the synthesized ballastless electrodes can be used in Li-batteries and cells with an average discharge voltage of 1.4-1.5 V. The use of Co2+ in the electrolyte deposition volatility is possible to increase the performance of Mo-sulfide electrodes; proposed pre-zincate processing aluminum base increased the ratio of the mass of the active material to the base of the mass. The novelty of the regulations and the results-for the first time experimentally obtained complete data on the effect of the nature of the cation in the electrolyte deposition and subsequent heat treatment deposits on their phase composition and electrochemical characteristics that allowed to establish: the degree of hydration of the synthesized compounds; during the heat treatment in the deposits ion Na+ included in the molybdenum-oxygen framework to form complex compounds. The first kinetic parameters of the interaction of the molybdenum sulphide with lithium were defined, which made it possible to identify: mixed control in the electrode process; temperature region effective conversion Mo2S3 in a non-aqueous electrolyte. Scope of use: The results of the thesis are essential for the production of electrodes for lithium batteries and primary cells.