Nanostructured TiO2-TiOF2 composite synthesized by the original method of pulsed high-voltage discharge as anode material for Li-ion battery

It has been demonstrated for the first time that an original method of pulsed high-voltage discharge is efficient for the preparing of nanostructures promising for application in Li-ion batteries. In particular, a nanostructured TiO2-TiOF2 composite is synthesized as a result of destructing Ti electrodes and polytetrafluoroethylene in plasma. It is established that TiO2-TiOF2 is a porous structure composed of TiO2 and TiOF2 nanocrystallites 40–200 nm in size. The diameter of pores varies from 3 to 5 nm. The discharge capacity of a Li/TiO2-TiOF2 half-cell during a first cycle at a current density of 20 mA/g in voltage range from 3 to 0.005 V amounted to 1370 mA h/g, which exceeds (due to the presence of TiO2) the theoretical capacity of TiOF2. The cycling of Li/TiO2-TiOF2 characterizes the stability of the capacity about 205 mA h/g after the 20th cycle. © 2015, Pleiades Publishing, Ltd.