Na2.44Mn1.79(SO4)(3): a new member of the alluaudite family of insertion compounds for sodium ion batteries
2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 36, 18564-18571 p.Article in journal (Refereed) Published
Sodium-ion batteries have been extensively pursued as economic alternatives to lithium-ion batteries. Investigating the polyanion chemistry, alluaudite structured Na2Fe2II(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 Fe-III/Fe-II 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+2xMn2-xII(SO4)(3) (x = 0.22) as a novel high-voltage cathode material for the first time. Following low-temperature (ca. 350 degrees 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+2xMn2-xII(SO4)(3) has been found to be a potential high-voltage (ca. 4.4 V) cathode material for sodium batteries.
Place, publisher, year, edition, pages
2015. Vol. 3, no 36, 18564-18571 p.
IdentifiersURN: urn:nbn:se:uu:diva-263052DOI: 10.1039/c5ta04527dISI: 000360490600029OAI: oai:DiVA.org:uu-263052DiVA: diva2:856862
FunderCarl Tryggers foundation Swedish Research Council