Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (1): 116-122.DOI: 10.11944/j.issn.1000-0518.2018.01.170016

• Full Papers • Previous Articles    

Preparation and Characterization of Nitrogen-doped Carbon-coated Lithium Titanate Anode for Lithium-ion Batteries

WAN Lu,FU Zhengbing()   

  1. College of Chemistry and Materials Science,Hubei Engineering University,Xiaogan,Hubei 432000,China
  • Received:2017-01-11 Accepted:2017-04-06 Online:2018-01-03 Published:2018-01-03
  • Contact: FU Zhengbing
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51402096), the Educational Commission of Hubei Province(No.B2016184)

Abstract:

Nitrogen-doped carbon-coated lithium titanate(Li4Ti5O12/NC) composites with high performance were prepared via the sol-gel method by using tetrabutyl titanate as the titanium source, lithium monohydrate as the source of lithium, citric acid as carbon source and carbamide as the source of nitrogen. The composites were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), Focuier transform infrared spectrometer(IR), thermal gravimetric analyzer(TG), scanning electron microscoy(SEM) and transmission electron microscopy(TEM). The results show that the composites are consisted of Li4Ti5O12 with a NC coating layer. The Li4Ti5O12/NC material with 9.48% of NC exhibits a better electrochemical performance. It delivers a capacity of 212.9 mA·h/g at the first discharge under 1C, after 100 cycles at 1C, it still retains a capacity of 160.1 mA·h/g. The NC coating does not change the material's morphology, but inhibits the growth of composite particles and increases the active site for Li+ ion insertion/extraction, and thus improves the rate capacity and electronic conductivity.

Key words: lithium titanate, sol-gel method, electrochemical performance