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Orientation-Dependent Arrangement of Antisite Defects in Lithium Iron(II) Phosphate Crystals

Authors

  • Sung-Yoon Chung Prof.,

    1. Department of Materials Science and Engineering, Inha University, Incheon 402-751 (Korea)
    2. Nalphates LLC, Wilmington, DE 19801 (USA), Fax: (+82) 32-862-5546
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    • These authors contributed equally to this work.

  • Si-Young Choi Dr.,

    1. Korea Institute of Materials Science, Changwon 641-831 (Korea)
    2. Institute of Engineering Innovation, University of Tokyo, Tokyo 113-8656 (Japan)
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    • These authors contributed equally to this work.

  • Takahisa Yamamoto Prof.,

    1. Department of Advanced Materials Science, University of Tokyo, Tokyo 113-8656 (Japan)
    2. Nanostructures Research Laboratory (Japan) Fine Ceramics Center, Nagoya 456-8587 (Japan)
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  • Yuichi Ikuhara Prof.

    1. Institute of Engineering Innovation, University of Tokyo, Tokyo 113-8656 (Japan)
    2. Nanostructures Research Laboratory (Japan) Fine Ceramics Center, Nagoya 456-8587 (Japan)
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  • This research was supported by the Korea Research Foundation, grant no. KRF 2008-331-D00249.

Abstract

original image

Aggregated antisite cations of iron (see picture, red) in the lithium sites of doped lithium iron phosphate (LiFePO4) are arranged preferentially along the b axis. To probe the peculiar array of the defects, Z-contrast STEM with a spherical-aberration correction is utilized. The images obtained using Z-contrast STEM suggest that the distribution of antisite defects in LiFePO4 can be adjusted for improved lithium ion transport.

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