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Na4-αM2+α/2(P2O7)2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe0.5Mn0.5, Mn): A Promising Sodium Ion Cathode for Na-ion Batteries

Authors

  • Kwang-Ho Ha,

    1. Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
    Current affiliation:
    1. K.H.H. and S.H.W. contributed equally to this work.
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  • Seung Hee Woo,

    1. Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
    Current affiliation:
    1. K.H.H. and S.H.W. contributed equally to this work.
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  • Duckgyun Mok,

    1. Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
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  • Nam-Soon Choi,

    1. Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
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  • Yuwon Park,

    1. School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul, 151-744, South Korea
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  • Seung M. Oh,

    1. School of Chemical and Biological Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul, 151-744, South Korea
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  • Youngshol Kim,

    1. SK Innovation Co., 325 Exporo, Yuseong-gu, Daejeon, 305-712, South Korea
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  • Jeongsoo Kim,

    1. SK Innovation Co., 325 Exporo, Yuseong-gu, Daejeon, 305-712, South Korea
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  • Junesoo Lee,

    1. SK Innovation Co., 325 Exporo, Yuseong-gu, Daejeon, 305-712, South Korea
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  • Linda F. Nazar,

    Corresponding author
    1. Department of Chemistry, University of Waterloo, 200 University Avenue west, Waterloo, Ontario, N2L 3G1, Canada
    • Department of Chemistry, University of Waterloo, 200 University Avenue west, Waterloo, Ontario, N2L 3G1, Canada.
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  • Kyu Tae Lee

    Corresponding author
    1. Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
    • Interdisciplinary School of Green Energy and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology (UNIST), 100 Banyeon-ri, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea
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Abstract

A new polyanion-based compound, Na3.12M2.44(P2O7)2 (M = Fe, Fe0.5Mn0.5, Mn) is synthesized and examined as a cathode for Na ion batteries. Off-stoichiometric synthesis induces the formation of a Na-rich phase, Na3.32Fe2.34(P2O7)2 - a member of the solid solution series Na4-αFe2+α/2(P2O7)2 (2/3 ≤ α ≤ 7/8) - which delivers a reversible capacity of about 85 mA h g−1 at ca. 3 V vs. Na/Na+ and exhibits very stable cycle performance. Above all, it shows fast kinetics for Na ions, delivering an almost constant 72% reversible capacity at rates between C/10 and 10C without the necessity for nanosizing or carbon coating. We attribute this to the spacious channel size along the a-axis, along with a single phase transformation upon de/sodiation.

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