Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (12): 3187-3192.doi: 10.3866/PKU.WHXB20101212

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Synthesis and Electrochemical Properties of High-Rate Spinel Li4Ti5Ol2/TiN Anode Material for Lithium-Ion Batteries

ZHOU Xiao-Ling, HUANG Rui-An, WU Zhao-Cong, YANG Bin, DAI Yong-Nian   

  1. National Engineering Laboratory for Vacuum Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
  • Received:2010-06-25 Revised:2010-09-02 Published:2010-12-01
  • Contact: HUANG Rui-An E-mail:rahuang2009@gmail.com
  • Supported by:

    The project was supported by the Natural Science Foundation of Yunnan Province, China (2009CD024).

Abstract:

Spinel Li4Ti5Ol2/TiN was successfully prepared by sol-gel processing using acetylacetone (ACAC) as a chelating ligand and polyethylene glycol (PEG) as a dispersant. The effect of the TiN film on the electrochemical properties of spinel Li4Ti5Ol2 for lithium-ion batteries was studied. The Li4Ti5Ol2/TiN was analyzed by X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images showed that this anode material with the TiN film was pure spinel Li4Ti5Ol2 and was of sub-micron size. The initial specific discharge capacity of the Li4Ti5Ol2/TiN is 173.0 mAh·g-1. When tested at a rate of 0.2C, 1C, 2C, and 5C, it still retained a discharge capacity of 170.6, 147.6, 135.6, and 111.0 mAh·g-1, respectively, after 10 cycles, indicating that Li4Ti5Ol2/TiN had better high-rate performance than that without the TiN film. The positive effect of the TiN film on lithium-ion batteries was also demonstrated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).

Key words: Lithium-ion battery, Spinel Li4Ti5Ol2, TiN film, Anode material, Sol-gel processing, Polyethylene glycol

MSC2000: 

  • O646