titanium dioxide

Within the work, an influence of manganese dopant on electrochemical performance of anatase titanium dioxide (Mn/Ti = 0.05; 0.1; 0.2) had been investigated. It was established that incorporation of Mn³⁺ into the TiO₂ lattice results in the formation of Ti_1 − xMn_xO₂ solid solution and increased anatase unit cell volume from 136.41 Å³ (undoped sample) to 137.25 Å³ (Mn/Ti = 0.05). The conductivity of doped TiO₂ rises up to two orders in magnitude.

TiO₂–TiOF₂ composite has been synthesized in plasma by the unique method of pulsed high-voltage discharge due to the destruction of Ti electrodes and polytetrafluoroethylene wire. TiO₂–TiOF₂ features have been investigated by scanning electron microscopy, X-ray diffraction, infrared spectroscopy, energy-dispersive X-ray analysis, Raman spectroscopy, and X-ray photoelectron spectroscopy. It has been shown that composite with a porous surface morphology includes the nanocrystallites of sizes ranging from 40 to 200 nm. The average diameter of the pore is 3–5 nm. Electrochemical characterization of the nanostructured porous TiO₂–TiOF₂ composite was carried out in view of its application as an anode-active material for Li-ion battery. The initial high specific capacity of the composite is equal up to 1370 mA·h g^–1 at a rate of 20 mA g^–1. It is higher (due to the TiO₂ presence) in comparison with up-to-date TiOF₂ anode materials. Galvanostatic charge–discharge cycling of the Li/TiO₂–TiOF₂ cell in the range of 3.0–0.005 V yields 205 mA·h g^–1 after 20 cycles.