Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries

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  • Additional Information
    • Affiliation:
      a Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (MOE), College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
      b Key Laboratory of Functional Nanomaterials and Technology in Universities of Shandong, Linyi University, Linyi, 276000, PR China
      c School of Chemistry and Chemical Engineering, Linyi University, Linyi, 276000, PR China
    • Keywords:
      Oxygen-deficient
      Cathode
      Sodium-ion batteries
      Electrochemical performance
    • Abstract:
      Na3V2O2(PO4)2F (denoted as NVOPF) is one of the most promising cathode materials for sodium-ion batteries because of its three-dimensional NASICON structure and high reversible capacity. However, the sluggish sodium-ion diffusion and poor electronic conductivity of NVOPF still hinder their practical application. The oxygen vacancies on the surface of anode materials could promote their charge-transfer kinetics. So far, there are many reports about metal oxide coating to improve the performance of the cathode material. However, it has rarely been reported that the performance of the cathode material is improved by coating with an oxygen-deficient metal oxide. Herein, in this paper, we have successfully synthesized the oxygen-deficient titanium dioxide coated Na3V2O2(PO4)2F (denoted as NVOPF@TiO2-x) nanosheets by a simple hydrothermal method combined with a high temperature calcination in Ar/H2. As a cathode for a sodium-ion half-cell, the NVOPF@TiO2-x delivers excellent cycling stability and rate capability. A reversible capacity of 105 mAh g−1 at 0.2 C after 100 charge-discharge cycles and 54 mAh g−1 at 1 C can be achieved after 500 cycles. The prominent electrochemical properties should be attributed to the effective diffusion of ion and improved transportation of electron in the TiO2-x layer, which is due to the enhanced donor density and number of active sites resulting from the formation of oxygen vacancies.
    • Abstract:
      @@@@Highlights •Synthesis of four different morphologies of NVOPF using four organic solvents.•The sheet structure has a higher surface area and a shorter ion/electron diffusion path.•The performance of the cathode material is improved by coating oxygen-deficient titanium dioxide.
    • ISSN:
      0925-8388
    • Accession Number:
      10.1016/j.jallcom.2019.152270
    • Accession Number:
      S0925838819335169
    • Copyright:
      © 2019 Elsevier B.V. All rights reserved.
  • Citations
    • ABNT:
      DU, P. et al. Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries. Journal of Alloys and Compounds, [s. l.], v. 814, 2020. DOI 10.1016/j.jallcom.2019.152270. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edselp&AN=S0925838819335169&custid=s8280428. Acesso em: 22 jan. 2020.
    • AMA:
      Du P, Li T, Jiang X, Wang D, Zheng X. Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries. Journal of Alloys and Compounds. 2020;814. doi:10.1016/j.jallcom.2019.152270.
    • APA:
      Du, P., Li, T., Jiang, X., Wang, D., & Zheng, X. (2020). Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries. Journal of Alloys and Compounds, 814. https://doi.org/10.1016/j.jallcom.2019.152270
    • Chicago/Turabian: Author-Date:
      Du, Peng, Ting Li, Xiaolei Jiang, Debao Wang, and Xiuwen Zheng. 2020. “Improving the Electrochemical Performance of Na3V2O2(PO4)2F Cathode by Using a Defect-Containing TiO2-x Coating for Sodium Ion Batteries.” Journal of Alloys and Compounds 814 (January). doi:10.1016/j.jallcom.2019.152270.
    • Harvard:
      Du, P. et al. (2020) ‘Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries’, Journal of Alloys and Compounds, 814. doi: 10.1016/j.jallcom.2019.152270.
    • Harvard: Australian:
      Du, P, Li, T, Jiang, X, Wang, D & Zheng, X 2020, ‘Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries’, Journal of Alloys and Compounds, vol. 814, viewed 22 January 2020, .
    • MLA:
      Du, Peng, et al. “Improving the Electrochemical Performance of Na3V2O2(PO4)2F Cathode by Using a Defect-Containing TiO2-x Coating for Sodium Ion Batteries.” Journal of Alloys and Compounds, vol. 814, Jan. 2020. EBSCOhost, doi:10.1016/j.jallcom.2019.152270.
    • Chicago/Turabian: Humanities:
      Du, Peng, Ting Li, Xiaolei Jiang, Debao Wang, and Xiuwen Zheng. “Improving the Electrochemical Performance of Na3V2O2(PO4)2F Cathode by Using a Defect-Containing TiO2-x Coating for Sodium Ion Batteries.” Journal of Alloys and Compounds 814 (January 25, 2020). doi:10.1016/j.jallcom.2019.152270.
    • Vancouver/ICMJE:
      Du P, Li T, Jiang X, Wang D, Zheng X. Improving the electrochemical performance of Na3V2O2(PO4)2F cathode by using a defect-containing TiO2-x coating for sodium ion batteries. Journal of Alloys and Compounds [Internet]. 2020 Jan 25 [cited 2020 Jan 22];814. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edselp&AN=S0925838819335169&custid=s8280428