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Influence of Cobalt and Vanadium Dopants on the Performance of TiO2(B) Nanowires used as anode Materials in Lithium-ion Batteries

Amirsalehi, Mahmoud | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48056 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. Li-ion batteries have been widely applied as power sources for portable electronic devices. Recently, Li-ion batteries are considered as the most promising energy storage technology for electric vehicle applications however, fundamental improvements are needed. TiO2 (B) is attractive candidate for anodes in rechargeable Li-ion batteries, due to their low cost, non-toxicity and favorable channel structure for fast lithium mobility. It is predicted that synthesis of doped nanostructure of this material, through reducing the diffusion pathway and formation of crystal defects, will increase the capacity of TiO2(B). In this investigation, Co and V doped TiO2(B) nanowires are synthesized by hydrothermal method and investigated the influence of doping on their electrochemical performances. Furthermore, the synthesized samples are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray Photoelectron Spectroscopy (XPS). In addition, Electrochemical properties of samples are studied through electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. Finally, the charge/discharge tests were carried out to investigate the performance of doped-TiO2(B) nanowires as anode in rechargeable Li-ion batteries. The average diameter of pure synthesized nanowires was 33 nm.The amount of 3 wt% Co and 5 wt% V as dopants, improved the morphology and induced the diameter of nanowires, furthermore, increased the anode discharge capacity , 25% and 39%, respectively
  9. Keywords:
  10. Titanium Dioxide ; Nanowire ; Lithium Ion Batteries ; Anode ; Doping ; Hydrothermal Method ; Electrochemical Tests

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