The mineral eldfellite, NaFe(SO4)2, is characterized as a potential cathode for a Na-ion battery that is fabricated in charged state; its 3 V discharge versus sodium for reversible Na+ intercalation is shown to have a better capacity, but lower insertion rate than Li+ intercalation. The theoretical specific capacity for Na+ insertion is 99 mA h g-1. After 80 cycles at 0.1C versus a Na anode, the specific capacity was 78 mA h g-1 with a coulomb efficiency approaching 100%.
Energy Environ. Sci., 2015,8, 3000-3005
DOI: 10.1039/C5EE02274F
原文链接：http://pubs.rsc.org/en/content/articlepdf/2015/ee/c5ee02274f
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