Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (10): 1264-1270.DOI: 10.11944/j.issn.1000-0518.2018.10.170454

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Sodium Titanate Nanotube-Carbon Composite as Negative Electrode Materials for Na-Ion Supercapattery

ZHAO Lipingac,TAO Keyua,WANG Hongyub,QI Lib*()   

  1. aCollege of Chemistry,Chemical Engineering and Environmental Engineering, Liaoning Shihua University,Fushun,Liaoning 113001,China
    bState Key Laboratory of Electroanalytical Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    cCollege of Chemistry,Northeast Normal University,Changchun 130024,China
  • Received:2017-12-15 Accepted:2018-03-06 Published:2018-10-01 Online:2018-10-09
  • Contact: QI Li
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21571173) , Talent Scientific Research Fund of LSHU(No.2016XJJ-020)

Abstract:

Sodium titanate nanotube-carbon(STN-C) composites were prepared by a hydrothermal method using TiO2, NaOH solution and glucose as starting materials. X-ray diffraction(XRD) and transmission electron microscopy(TEM) were employed to characterize its crystal morphology. N2 adsorption-desorption and thermogravimetry(TG) methods were applied to confirm its pore structure and mass ratio of carbon. STN-C was adopted as negative electrode materials for the asymmetric electrochemical supercapatteries of STN-C/graphite using Na+-based organic electrolytes. This type of supercapatteries possess the working voltage as high as 3.5 V. The charge storage mechanism at the negative electrode was studied and the effect of mass ratio of graphite/STN-C was investigated. The electrochemical performance tests reveal that the supercapatteries have relatively high energy density and power density, i.e., 72 Wh/Kg and 1256 W/Kg, respectively. The supercapatteries also show high cycle stability, displaying a 100% capacity retention after 1000 cycles at a current density of 0.17 A/g.

Key words: sodium titanate nanotube, graphite, sodium-ion, electrochemical supercapattery, negative electrode materials