An amorphous iron hydroxysulfate Na3Fe3(SO4)2(OH)6 has been prepared for the first time from sodium insertion into the crystalline phase NaFe3(SO4)2(OH)6. We show that this transformation is completely reversible, leading back to the well crystallized hexagonal phase on oxidation. This material could then be proposed as positive electrode material for Na ion batteries with a reversible capacity of 120mAh/g at 2.72V vs Na+/Na.
Solid State Ionics – Elsevier
Published: Oct 1, 2015
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