Sycheva V. O. RussiaSaratov Saratov State University, 83, Astrakhanskaya St., Saratov, 410012 Author's articles Lithium intercalation into thin-film lithium-tin and lithium-carbon electrodes: an impedance spectroscopy study Fuel cells on boron-hydride fuel The lithium-manganese spinels: the methods of enhancement of their stability and power intensity The lithium – iron phosphate LiFePO4 as cathode material for lithium-ion batteries A model of fuel transformation at discharge of direct borohydride fuel cell