Kinetic properties

Nuclear magnetic resonance study of lithium diffusion in intercalated titanium diselenides

R. V. Skoryunov^a, O. A. Babanova^ab, A. V. Soloninin^a, A. N. Titov^a, O. V. Bushkova^c, A. V. Skripov<sup>a

a</sup> Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
^c Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences, Ekaterinburg

Abstract: To study the dynamical properties of intercalated compounds Li$_x$TiSe$_2$ ($x$ = 0.25, 1), we have measured the $^7$Li 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 Li$_{0.25}$TiSe$_2$ is characterized by the activation energy of 501(28) meV, and in LiTiSe$_2$ by the activation energy of 509(15) meV. The diffusion coefficients and ionic conductivity of Li$^+$ in both Li$_{0.25}$TiSe$_2$ and LiTiSe$_2$ have been estimated at 297 K.

Keywords: spin-lattice-relaxation, layered dichalcogenides, atomic motion, quasi-2D diffusion, cathode materials.

Received: 18.07.2025
Revised: 18.07.2025
Accepted: 12.11.2025

DOI: 10.61011/FTT.2025.11.62148.203-25

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