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    Synthesis of pristine and carbon-coated Li4Ti5O12 and their low-temperature electrochemical performance

    Access Status
    Fulltext not available
    Authors
    Yuan, T.
    Yu, X.
    Cai, R.
    Zhou, Y.
    Shao, Zongping
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Yuan, T. and Yu, X. and Cai, R. and Zhou, Y. and Shao, Z. 2010. Synthesis of pristine and carbon-coated Li4Ti5O12 and their low-temperature electrochemical performance. Journal of Power Sources. 195 (15): pp. 4997-5004.
    Source Title
    Journal of Power Sources
    DOI
    10.1016/j.jpowsour.2010.02.020
    ISSN
    0378-7753
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/13947
    Collection
    • Curtin Research Publications
    Abstract

    Pristine and carbon-coated Li4Ti5O12 oxide electrodes are synthesized by a cellulose-assisted combustion technique with sucrose as organic carbon source and their low-temperature electrochemical performance as anodes for lithium-ion batteries are investigated. X-ray diffraction (XRD), infrared spectroscopy (IR), Raman spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) are applied to characterize the phase structure, composition, and morphology of the composites. It is found that the sequence of sucrose addition has significant effect on the phase formation of Li4Ti5O12. Carbon-coated Li4Ti5O12 is successfully prepared by coating the pre-crystallized Li4Ti5O12 phase with sucrose followed by thermal treatment. Electrochemical lithium insertion/extraction performance is evaluated by the galvanostatic charge/discharge tests, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), from room temperature (25 °C) to -20 °C. The carbon-coated composite anode materials show improved lithium insertion/extraction capacity and electrode kinetics, especially at high rates and low temperature. Both of the two samples show fairly stable cycling performance at various temperatures, which is highly promising for practical applications in power sources of electric or electric-hybrid vehicles. © 2010 Elsevier B.V. All rights reserved.

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