Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (11): 2962-2966.doi: 10.3866/PKU.WHXB20101101

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Preparation and Electrochemical Performance of H2Ti2O5·H2O/Cr2O3 Nanotubes as AnodeMaterials for Lithium-Ion Batteries

HE Yong, TANG Zi-Long, ZHANG Zhong-Tai   

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China
  • Received:2010-06-25 Revised:2010-08-25 Published:2010-10-29
  • Contact: TANG Zi-Long E-mail:tzl@tsinghua.edu.cn
  • Supported by:

    The project was supported by the National High-Tech Research and Development Programof China (863) (2007AA03Z235).

Abstract:

One problem that limits the rate capabilities of lithium-ion batteries is that despite the small size of the nanocrystalline particles in the electrode material, the crystalline structure might collapse during repetitive Li+ intercalation and extraction leading to the deterioration of charge and discharge performance under high currents. The prevention of this destruction has been attempted by substituting constituent atoms with other atoms to stabilize the structure in various transition metal oxide systems. In this work, H2Ti2O5·H2O/Cr2O3 compounds with nanotubes morphology were prepared by low temperature alkali-hydrothermal processing from anatase-type TiO2 with the addition of 5% (w) Cr2O3. The crystal structure and morphology of the as-prepared H2Ti2O5·H2O/Cr2O3 nanotubes were investigated by X-ray diffraction and transmission electron microscopy, respectively. Electrochemical lithium insertion cycling tests showed excellent cycling stability and an improved rate capability. The capacity of the first cycle was 288 mAh·g-1, and over 145 mAh·g-1 capacity remained after 120 cycles at 150 mA·g-1. At a current of 1500 mA·g-1, the capacity of the first cycle was 178 mAh·g-1. Over 80 mAh·g-1 capacity remained after 600 cycles at 1500 mA·g-1; furthermore, the capacity could come back to 150 mAh·g-1 at 150 mA·g-1 after 600 cycles at 1500 mA·g-1, which was close to the result for the cell that was immediately discharged/charged at 150 mA·g-1. The Cr2O3 particles, as the second phase, can improve the structural stability and high-rate capability of the H2Ti2O5·H2O nanotubes. These novel one-dimensional nanostructured materials may find promising applications in lithium-ion batteries and in electrochemical cells.

 

Key words: Nanotube, H2Ti2O5·H2O/Cr2O3, Alkali-hydrothermal reaction, Electrochemical lithium-ion insertion, High-rate capability

MSC2000: 

  • O646