J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (6): 527-534.DOI: 10.1016/j.jmst.2016.11.011

• Orginal Article • Previous Articles     Next Articles

Characterization and Electrochemical Properties of Nanostructured Zr-Doped Anatase TiO2 Tubes Synthesized by Sol-Gel Template Route

Opra Denis P.1(), Gnedenkov Sergey V.1, Sinebryukhov Sergey L.1, Voit Elena I.1, Sokolov AlexanderA.1, Modin Evgeny B.2, Podgorbunsky Anatoly B.1, Sushkov Yury V.1, Zheleznov Veniamin V.1   

  1. 1 Institute of Chemistry, Far Eastern Branch of Russian Academy of Sciences, Vladivostok 690022, Russia
    2Far Eastern Federal University, Vladivostok 690950, Russia
    3National Research Centre “Kurchatov Institute”, Moscow 123182, Russia
  • Received:2016-07-22 Revised:2016-09-22 Accepted:2016-11-02 Online:2017-06-20 Published:2017-08-22
  • About author:

    These authors contributed equally to this work.

Abstract:

A series of nanostructured Zr-doped anatase TiO2 tubes with the Zr/Ti molar ratio of 0.01, 0.02, 0.03, and 0.09 were prepared by a sol-gel technology on a carbon fiber template. The electrochemical performance of Zr-doped anatase TiO2 as anodes for rechargeable lithium batteries was investigated and compared with undoped titania. Tests represented that after 35-fold charge/discharge cycling at C/10 the reversible capacity of Zr-doped titania (Zr/Ti = 0.03) reaches 135 mA h g-1, while the capacity of undoped titania (Zr/Ti = 0) yielded only 50 mA h g-1. Based on the results of the physicochemical investigation, three reasons of improving electrochemical performance of Zr-doped titania were suggested. According to the scanning electron microscopy and transmission electron microscopy, Zr4+ doping induces a decrease in nanoparticle size, which facilitates the Li+ diffusion. The Raman investigations show the more open structure of Zr-doped TiO2 as compared to undoped titania due to changing of the unit cell parameters, that significantly affects on the reversibility of the insertion/extraction process. The electrochemical impedance spectroscopy results indicate that substitution of Zr4+ for Ti4+ into anatase TiO2 has favorable effects on the conductivity.

Key words: Li-ion batteries, Anatase titania, Nanostructured materials, Sol-gel template process, Doping, Electrochemical performance