Citation: HE Yong, TANG Zi-Long, ZHANG Zhong-Tai. Preparation and Electrochemical Performance of H₂Ti₂O₅·H₂O/Cr₂O₃ Nanotubes as AnodeMaterials for Lithium-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2010, 26(11): 2962-2966. doi: 10.3866/PKU.WHXB20101101 shu

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

1.
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China

Received Date: 25 June 2010
Available Online: 6 September 2010
Fund Project: 国家高技术研究发展计划项目(863) (2007AA03Z235)资助 (863) (2007AA03Z235)

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.
- Nanotube,
- H₂Ti₂O₅·H₂O/Cr₂O₃,
- Alkali-hydrothermal reaction,
- Electrochemical lithium-ion insertion,
- High-rate capability
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Preparation and Electrochemical Performance of H₂Ti₂O₅·H₂O/Cr₂O₃ Nanotubes as AnodeMaterials for Lithium-Ion Batteries