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Kwang-Ho Ha, Seung Hee Woo, Duckgyun Mok, Nam-Soon Choi, Yuwon Park, Seung M. Oh, Youngshol Kim, Jeongsoo Kim, Junesoo Lee, Linda F. Nazar and Kyu Tae Lee 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 Advanced Energy Materials 3

Version of Record online: 18 FEB 2013 | DOI: 10.1002/aenm.201200825

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A promising 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 which delivers a reversible capacity of about 85 mA h g−1 at ca. 3 V vs. Na/Na+ with very stable cycle performance.

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