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High-Performance Carbon-LiMnPO4 Nanocomposite Cathode for Lithium Batteries

Authors

  • Seung-Min Oh,

    1. Department of WCU Energy Engineering, Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of (Korea)
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  • Sung-Woo Oh,

    1. Department of WCU Energy Engineering, Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of (Korea)
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  • Chong-Seung Yoon,

    1. Department of Materials Science and Engineering, Hanyang University, Seoul 133-791, Republic of (Korea)
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  • Bruno Scrosati,

    Corresponding author
    1. Department of Chemistry, University of Rome “La Sapienza”, Piazza Aldo Moro 5, 00185 (Italy)
    • Department of Chemistry, University of Rome “La Sapienza”, Piazza Aldo Moro 5, 00185 (Italy).
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  • Khalil Amine,

    1. Electrochemical Technology Program, Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 (USA)
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  • Yang-Kook Sun

    Corresponding author
    1. Department of WCU Energy Engineering, Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of (Korea)
    • Department of WCU Energy Engineering, Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of (Korea)
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Abstract

A cathode material of an electrically conducting carbon-LiMnPO4 nanocomposite is synthesized by ultrasonic spray pyrolysis followed by ball milling. The effect of the carbon content on the physicochemical and electrochemical properties of this material is extensively studied. A LiMnPO4 electrode with 30 wt% acetylene black (AB) carbon exhibits an excellent rate capability and good cycle life in cell tests at 55 and 25 °C. This electrode delivers a discharge capacity of 158 mAh g−1 at 1/20 C, 126 mAh g−1 at 1 C, and 107 mAh g−1 at 2 C rate, which are the highest capacities reported so far for this type of electrode. Transmission electron microscopy and Mn dissolution results confirm that the carbon particles surrounding the LiMnPO4 protect the electrode from HF attack, and thus lead to a reduction of the Mn dissolution that usually occurs with this electrode. The improved electrochemical properties of the C-LiMnPO4 electrode are also verified by electrochemical impedance spectroscopy.

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