期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 36, 页码 18564-18571出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta04527d
关键词
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资金
- Department of Science and Technology (DST), Govt. of India under the aegis of Solar Energy Research Initiative (SERI) programme [DST/TMC/SERI/FR/169]
- Ministry of Human Resource Development (MHRD)
- Erasmus Mundus
- Carl Tryggers Stiftelse for Vetenskaplig Forskning (CTS)
- Swedish Research Council (VR)
- Swedish Energy Agency STandUP
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.
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