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Issue 36, 2015

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

Author affiliations

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

Supplementary files

Article information


Submitted
20 Jun 2015
Accepted
31 Jul 2015
First published
31 Jul 2015

J. Mater. Chem. A, 2015,3, 18564-18571
Article type
Paper
Author version available

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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