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    Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO<inf>4</inf>

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    Fulltext not available
    Authors
    Wang, Y.
    Zhang, D.
    Yu, X.
    Cai, R.
    Shao, Zongping
    Liao, X.
    Ma, Z.
    Date
    2010
    Type
    Journal Article
    
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    Citation
    Wang, Y. and Zhang, D. and Yu, X. and Cai, R. and Shao, Z. and Liao, X. and Ma, Z. 2010. Mechanoactivation-assisted synthesis and electrochemical characterization of manganese lightly doped LiFePO<inf>4</inf>. Journal of Alloys and Compounds. 492 (1-2): pp. 675-680.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2009.12.014
    ISSN
    0925-8388
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/23786
    Collection
    • Curtin Research Publications
    Abstract

    Olivine compounds LiFe1-xMnxPO4 (0.0 = x = 0.3) for cathodes of secondary lithium-ion batteries were synthesized via a mechanoactivation-assisted solid-state reaction. The optimal manganese content and electrochemical performance of the as-synthesized powders were investigated by XRD, EDX mapping, cyclic voltammetry, and charge-discharge characterizations. According to XRD and EDX mapping results, phase-pure compounds with olivine structure were formed after the calcination under nitrogen atmosphere at 700 °C for 20 h. Among the various LiFe1-xMnxPO4 under test, LiFe0.8Mn0.2PO4 showed the highest electrical conductivity, which reached a value of 3.49 × 10-5 S cm-1 at room temperature, more than 5 orders higher than that of pristine LiFePO4 (1.08 × 10-10 S cm-1). Without the carbon coating, pristine LiFe0.8Mn0.2PO4 showed discharge capacity of ~123 and 100 mAh g-1 at 0.1 and 1 C rates, respectively. It means about 91% and 74% of the Fe2+ in LiFe0.8Mn0.2PO4 is electrochemically utilizable correspondingly. For a comparison, they are only 65% and 15% for the pristine LiFePO4 prepared by a similar process. LiFe1-xMnxPO4 also showed stable cycling performance within the 50 cycles under test. It suggests manganese lightly doped LiFePO4 could be practical cathode materials for high-rate lithium-ion batteries. © 2009 Elsevier B.V. All rights reserved.

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