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Unique Structural Changes of Three-Dimensionally Ordered Macroporous TiO2 Electrode Materials During Electrochemical Cycling

Authors

  • Hyejung Kim,

    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
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  • Min Gyu Kim,

    Corresponding author
    1. Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang 790-784, Republic of Korea
    • Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang 790-784, Republic of Korea.
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  • Jaephil Cho

    Corresponding author
    1. Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
    • Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea
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Abstract

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Structural changes during lithium intercalation (to x = 1.1 in LixTiO2) are studied in three-dimensionally ordered macroporous (3DOM)-TiO2 (figure) prepared by colloidal crystal templating. During the charging/discharging cycles, the pristine crystalline domains are pulverized to smaller nanodomains (∼4 nm), but the original 3DOM structure remains robust and maintains its pristine pore-wall thickness. The long-range ordered crystalline orthorhombic phase is partially transformed into the short-range order amorphous phase and Jahn–Teller distortion is also observed.

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