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Title: Influence of Mn/Fe Ratio on Electrochemical and Structural Properties of P2-NaxMn 1–yFeyO2 Phases as Positive Electrode Material for Na-Ion Batteries

Journal Article · · Chemistry of Materials

The comparative structural, Mössbauer, and electrochemical studies of the NaxMn2/3Fe1/3O2 and NaxMn1/2Fe1/2O2 systems show that the change in the Mn/Fe ratio has a significant influence on the overlap between the Mn3+/4+ and Fe3+/4+ redox couples. The P2-type structure is maintained in the 0.3 < x < 0.8 domain. For the highest intercalation amount, structural distortions occur due to the Jahn–Teller effect of the Mn3+ ions. The macroscopic distortion results from a competition between the opposite effects of Mn3+ and Fe3+: the isotropic character of Fe3+ tends to prevent the macroscopic distortion. For the lower sodium amounts, the instability of the interstitial trigonal prismatic space leads to the formation, by slab gliding, of a very disordered structure. Even if this structural transition is reversible, we note a strong capacity fading is observed if the cell is charged above 4 V verus Na/Na+.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Agence Nationale de la Recherché (ANR); Region Aquitaine; The French National Centre for Scientific Research (CNRS); USDOE Office of Science (SC)
Grant/Contract Number:
2011-IS08-01; AC02-06CH11357
OSTI ID:
1484781
Journal Information:
Chemistry of Materials, Vol. 30, Issue 21; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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