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Nuclear Magnetic Resonance Study of Lithium Diffusion in Intercalated Titanium Diselenides
Russian version
Skoryunov R. V.1, Babanova O. A.1,2, Soloninin A. V.1, Titov A. N.1, Bushkova O. V.3, Skripov A. V.1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
3Institute of Solid State Chemistry, Russian Academy of Sciences, Ural Branch, Yekaterinburg, Russia
Email: skoryunov@imp.uran.ru
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To study the dynamical properties of intercalated compounds LixTiSe2 (x=0.25, 1), we have measured the 7Li nuclear magnetic resonance spectra and spin-lattice relaxation rates in these compounds over the temperature range of (80-593 K). It has been shown that the behavior of the spin-lattice relaxation rates above 300 K is determined by quasi-two-dimensional translational diffusion of Li+ ions. The diffusion of lithium in Li0.25TiSe2 is characterized by the activation energy of 501(28) meV, and in LiTiSe2 by the activation energy of 509(15) meV. The diffusion coefficients and ionic conductivity of Li+ in both Li0.25TiSe2 and LiTiSe2 have been estimated at 297 K. Keywords: spin-lattice-relaxation, layered dichalcogenides, atomic motion, quasi-2D diffusion, cathode materials.
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