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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 Batteries: 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 (Adv. Energy Mater. 6/2013) Advanced Energy Materials 3

Version of Record online: 4 JUN 2013 | DOI: 10.1002/aenm.201370023

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Sodium-ion batteries are an attractive alternative to replace Lithium-ion batteries and Ni–metal hydride batteries for electric vehicle and smart grid applications. Kyu Tae Lee, Linda F. Nazar, and co-workers demonstrate on page 770, for the first time, the synthesis of new polyanion-based compounds, Na3.12M2.44(P2O7)2 (M=Fe, Fe0.5Mn0.5, Mn), and their electrochemical performance as a cathode material for Na ion batteries. The deliberate synthesis of the off-stoichiometric phase, Na3.42Fe2.44(P2O7)2.05 shows excellent cycle and rate performance, and this is attributed to the spacious channel size along the a-axis, along with a single phase transformation upon de/sodiation.

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