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Gigantic Capacito-Energetic Parameters of Lithium-Intercalation Current Generation Reaction in Nanodispersed TiO_{2} with Defective Structure

100%
Grygorchak I., Myronyuk I., Micov M., Pidluzhna A., Ostapuk O.
Acta Physica Polonica A
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2010
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vol. 117
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issue 1
189-194
EN
To determine the reasons of the difference between the parameters of lithium intercalation process for materials of the same nature, the nanodispersed TiO_{2} was synthesized by pyrogenic method from TiCl_{4} in hydrogen-air flame with SiCl_{4} doping precursor and was compared with TiO_{2} of "Merck" quality. The X-ray analysis with the use of small-angle scattering method, electronic scanning microscopy and impedance spectroscopy were used to determine aforesaid parameters. Obtained results show that the reason of such behaviour lays in size effect and in modification of energetic topology of impurity system. Thermodynamic parameters of intercalation reaction agree well with investigated properties of ceramic samples.
2
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Supercapacity of Soft-Expanded Graphite in Li-Intercalational Electric Current Generation

73%
Shvets R., Grygorchak I., Kurepa A., Pokladok N., Sementsov Y., Dovbeshko G., Sheregii Y., Seredyuk B.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
208-209
EN
A microwave-intercalation modification of natural graphite which ensures its effective use as a cathode material of Li-based sources of electric current is developed. Interconnection between the parameters of modification and thermodynamic and kinetic behavior of Li-intercalation electric current generation is established. On the basis of the obtained data from impedance spectroscopy, X-ray diffractometry analysis, and spectroscopy of the Raman scattering of light, the mechanism of the observed phenomena is suggested.
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