Kolomoyets O. Electrochemical Synthesis of Fe-, Ni-, Сo-sulphides for lithium thin film accumulator

The objects of investigation are the process of electrochemical synthesis of sulphides of transition metals (M = Fe, Co, Ni) and energy conversion in lithium electrochemical cells with electrodes based on the synthesized Fe-, Co-, Ni- sulphides. The purpose is improvement of the electrochemical synthesis of mono- and bimetal-sulphides Fe, Ni, Co from aqueous electrolytes, analysis and identification the basic laws of the electrochemical conversion of the synthesized materials in the model thin-film lithium batteries with non-aqueous electrolyte in order to improve their energy performance. Меthods: optical microscopy and scanning electron microscopy; X-ray analysis; electrochemical studies in galvanostatic mode; cyclic voltammetry, electrochemical impedance spectroscopy, step chronoamperometry. Results: the electrochemical synthesis of iron sulfide from aqueous solutions is improved, the method of the bimetal sulfides (FeNi, FeCo) synthesis and their modifications by graphite due the aim to produce electrodes for thin film lithium batteries with a nonaqueous electrolyte with improved discharge characteristics. The possibility of using synthetic materials as positive electrodes for lithium batteries, and as negative electrodes of lithium-ion system instead of graphite was shown.