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Issue 36, 2015
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Na2.44Mn1.79(SO4)3: a new member of the alluaudite family of insertion compounds for sodium ion batteries

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Abstract

Sodium-ion batteries have been extensively pursued as economic alternatives to lithium-ion batteries. Investigating the polyanion chemistry, alluaudite structured Na2FeII2(SO4)3 has been recently discovered as a 3.8 V positive electrode material (Barpanda et al., Nature Commun., 5:4358, 2014). Registering the highest ever FeIII/FeII redox potential (vs. Na/Na+) and formidable energy density, it has opened up a new polyanion family for sodium batteries. Exploring the alluaudite family, here we report isotypical Na2+2xMnII2−x(SO4)3 (x = 0.22) as a novel high-voltage cathode material for the first time. Following low-temperature (ca. 350 °C) solid-state synthesis, the structure of this new alluaudite compound has been solved adopting a monoclinic framework (s.g. C2/c) showing antiferromagnetic ordering at 3.4 K. Synergising experimental and ab initio DFT investigation, Na2+2xMnII2−x(SO4)3 has been found to be a potential high-voltage (ca. 4.4 V) cathode material for sodium batteries.

Graphical abstract: Na2.44Mn1.79(SO4)3: a new member of the alluaudite family of insertion compounds for sodium ion batteries

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Publication details

The article was received on 20 Jun 2015, accepted on 31 Jul 2015 and first published on 31 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA04527D
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2015,3, 18564-18571
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    Na2.44Mn1.79(SO4)3: a new member of the alluaudite family of insertion compounds for sodium ion batteries

    D. Dwibedi, R. B. Araujo, S. Chakraborty, P. P. Shanbogh, N. G. Sundaram, R. Ahuja and P. Barpanda, J. Mater. Chem. A, 2015, 3, 18564
    DOI: 10.1039/C5TA04527D

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