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Т. Я. Бойчук, І. М. Будзуляк, Н. Я. Іванічок , Б. І. Рачій
«Інтеркаляційна здатність шпінелей LiMn1,95Fe0,05O4 та LiMn1,8Fe0,2O4 у водному розчині літійвмісного електроліту »
305–312 (2015)

PACS numbers: 61.05.cp, 68.37.Hk, 73.63.Bd, 82.45.Yz, 82.47.Uv, 82.47.Wx, 84.32.Tt

In this paper, the intercalation-capacity studies of Faraday electrode active material of hybrid supercapacitors based on nanoscale fractions of lithium–manganese spinels doped with iron are presented. Phase composition, lattice parameters, and the cations’ distribution in sublattices of the material are determined by X-ray diffraction. As shown, the increase of the annealing temperature in sol–gel synthesis up to 1073 K leads to single-phase compounds with grains’ size of about 70 nm. Additionally, for the degree of doping of y???0.2 at the temperature of 873 K, the appearance of hematite phase is observed. This phase disappears with increasing of the annealing temperature. The relation between localization of introduced iron and electrochemical properties of iron spinels in aqueous lithium-containing electrolyte is determined. The calculated value of specific capacity is the maximum for the sample with a degree of doping equal to 0.05 and obtained at the temperature of 1073 K. This is due to favourable structural conditions (low concentration of lithium within the tetrahedral sublattice) for easy lithium penetration into the spinel cavities and great contribution of intercalation in the process of electricity (electric-energy) accumulation.