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Influence of vanadium, cobalt-codoping on electrochemical performance of titanium dioxide bronze nanobelts used as lithium ion battery anodes

Amirsalehi, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1007/s10854-018-9429-x
  3. Publisher: Springer New York LLC , 2018
  4. Abstract:
  5. In this work, V, Co-codoped TiO2(B) samples are synthesized through a hydrothermal method, and used as negative electrode materials for lithium ion batteries. The amount of dopants is varied in order to investigate their influence on electrochemical properties. The formation of V, Co-codoped TiO2(B) nanobelts with widths of 20 and 60 nm is demonstrated using X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma–optical emission spectrometry and field-emission scanning electron microscopy analyses. In addition, the electrochemical properties of the samples are tested by cyclic voltammetry, charging/discharging, and cyclic performance techniques. Compared to other samples, TiO2(B) nanobelts codoped with 2.5 wt% Co–2.5 wt% V, shows the best cycling performance, and exhibits the first high capacity of 264.86 mAh g−1 [x = 0.79, LiXTiO2(B)] at a rate of 0.5 C due to the improved Li+ diffusion and electronic conductivity, induced by crystal defects and oxygen vacancy. This electrode demonstrates excellent cyclability and has more than 96% capacity even after 50 cycles. It is concluded that the concentration of dopants in the TiO2(B) structure plays an effective role in improving the electrochemical performance of electrodes. © 2018 Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Anodes ; Cobalt ; Cobalt compounds ; Cobalt deposits ; Crystal defects ; Cyclic voltammetry ; Doping (additives) ; Electrochemical electrodes ; Electrochemical properties ; Field emission microscopes ; Inductively coupled plasma ; Lithium-ion batteries ; Nanobelts ; Optical emission spectroscopy ; Oxygen vacancies ; Scanning electron microscopy ; Titanium dioxide ; Vanadium ; Vanadium compounds ; X ray photoelectron spectroscopy ; Charging/discharging ; Electrochemical performance ; Electronic conductivity ; Field emission scanning electron microscopy ; Hydrothermal methods ; Lithium-ion battery anodes ; Negative electrode material ; Optical emission spectrometry ; Boron compounds
  8. Source: Journal of Materials Science: Materials in Electronics ; 2018 , Pages 1-9 ; 09574522 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10854-018-9429-x