期刊
CHEMELECTROCHEM
卷 2, 期 7, 页码 1019-1023出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201500036
关键词
alluaudite; high-voltage cathode; nonstoichiometric compounds; sodium-ion batteries; sodium iron sulfate
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) under the 'Element Strategy Initiative for Catalysts and Batteries' (ESICB)
- JSPS
- Grants-in-Aid for Scientific Research [14J11078] Funding Source: KAKEN
An alluaudite-type sodium iron sulfate has recently been discovered as a 3.8 V cathode material for low-cost, high-power, and efficient sodium-ion batteries. To optimize the composition of the alluaudite phase and to explore further compounds, we have carefully surveyed the Na2SO4-FeSO4 binary system. Solid-state reactions at a moderate temperature of 623 K produce two stable phases: 1)vanthoffite-structured Na6Fe(SO4)(4) and 2)alluaudite-type Na2+2xFe2-x(SO4)(3) with a certain non-stoichiometry. The possible compositional and structural flexibilities demonstrated in this work inspire further improvement of the alluaudite-type sodium metal sulfates for advanced sodium-ion batteries.
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