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Yolk–Shell, Hollow, and Single-Crystalline ZnCo2O4 Powders: Preparation Using a Simple One-Pot Process and Application in Lithium-Ion Batteries

Authors

  • Seung Ho Choi,

    1. Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea), Fax: (+82) 2 4583504
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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), Fax: (+82) 2 4583504
    • Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea), Fax: (+82) 2 4583504

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Abstract

The electrochemical properties of yolk–shell-structured, multi-component, transition-metal oxides have not yet been properly compared to those of hollow-structured or nanoscale powders. In this study, yolk–shell, hollow, and single-crystalline ZnCo2O4 powders with uniform compositions are prepared by using simple gas-phase reaction methods. Double-shelled ZnCo2O4 yolk–shell powder is prepared directly from the spray solution by using spray pyrolysis. Single-crystalline ZnCo2O4 nanopowder is prepared by means of flame spray pyrolysis. The yolk–shell ZnCo2O4 powder shows higher charge and discharge capacities than the hollow and single-crystalline powders. The yolk–shell, hollow, and single-crystalline ZnCo2O4 powders deliver discharge capacities of 753, 586, and 206 mAh g−1, respectively, after 200 cycles at a charge/discharge rate of 3 A g−1, and the corresponding capacity retentions measured after the first cycle are 99, 74, and 27 %, respectively. The yolk–shell ZnCo2O4 powders are structurally stable during cycling and have good electrochemical properties even at high current densities.

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