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Na 4‐α M 2+α/2 (P 2 O 7 ) 2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe 0.5 Mn 0.5 , Mn): A Promising Sodium Ion Cathode for Na‐ion Batteries

Na 4‐α M 2+α/2 (P 2 O 7 ) 2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe 0.5 Mn 0.5 , Mn): A Promising Sodium Ion... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Na 4‐α M 2+α/2 (P 2 O 7 ) 2 (2/3 ≤ α ≤ 7/8, M = Fe, Fe 0.5 Mn 0.5 , Mn): A Promising Sodium Ion Cathode for Na‐ion Batteries

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References (37)

Publisher
Wiley
Copyright
Copyright © 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.201200825
Publisher site
See Article on Publisher Site

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.

Journal

Advanced Energy MaterialsWiley

Published: Jun 1, 2013

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