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The results on the study of functional layers of a solid-state thin-film lithium-ion batteries are presented. Thin-films of lithium cobaltite (positive electrode), silicon nanocomposite (negative electrode) and lithium phosphorus-oxynitride (solid electrolyte) were studied by the methods of electron microscopy, energy dispersive analysis and X-ray phase analysis. Technological modes have been determined which make it possible to obtain functional layers with a large-block and columnar structure providing the full depth of electrodes lithiation-delithiation and high ionic conductivity of the solid electrolyte.

The paper presents the results of studying the polarization relaxation mechanism in solid electrolyte LiPON by the method of discharge through an external load. Test cells made in the form of encapsulated multilayer structures SiO2/Pt/LiPON/Pt/Ti/SiO2/Si were tested on a stand for discharge characteristics measuring. To explain the discharge curves, an equivalent LiPON circuit and a mathematical model of polarization relaxation during discharge are proposed. By fitting the parameters of a mathematical model, the Maxwellian relaxation times of lithium ions and that of the LiPON ionic polarization relaxation are determined.

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