Preparation of Li4Ti5O12 Yolk–Shell Powders by Spray Pyrolysis and their Electrochemical Properties

Authors

  • Kwang Min Yang,

    1. Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea)
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    • These two authors contributed equally to this work.

  • You Na Ko,

    1. Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea)
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    • These two authors contributed equally to this work.

  • Dr. Jung-Yeul Yun,

    1. Powder Technology Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsan-gu„ Changwon, Gyeongnam, 642-831 (Korea)
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  • Prof. Yun Chan Kang

    Corresponding author
    1. Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea)
    • Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea)

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Abstract

We have reported for the first time the preparation of yolk–shell-structured Li4Ti5O12 powders for use as anode materials in lithium-ion batteries. One Li4Ti5O12 yolk–shell-particle powder is directly formed from each droplet containing lithium, titanium, and carbon components inside the hot wall reactor maintained at 900 °C. The precursor Li4Ti5O12 yolk–shell-particle powders, which are directly prepared by spray pyrolysis, have initial discharge and charge capacities of 155 and 122 mA h g−1, respectively, at a current density of 175 mA g−1. Post-treatment of the yolk–shell-particle powders at temperatures of 700 and 800 °C improves the initial discharge and charge capacities. The initial discharge capacities of the Li4Ti5O12 powders with a yolk–shell structure and a dense structure post-treated at 800 °C are 189 and 168 mA h g−1, respectively. After 100 cycles, the corresponding capacities are 172 and 152 mA h g−1, respectively (retentions of 91 and 90 %).

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