Electrochemical and thermal properties of P2-type Na 2/3 Fe 1/3 Mn 2/3 O 2 for Na-ion batteries

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Abstract

P2-type Na2/3Fe1/3Mn2/3O2 was prepared by means of solid-state reaction. Its electrochemical properties as a cathode for sodium-ion batteries were investigated in the 1.5-4.3 V range vs. Na metal. This material delivers an initial discharge capacity as high as 193 mAh/g and maintains 153 mAh/g in 40 cycles. Such a high reversible capacity is achieved because both Mn3+/Mn4+ and Fe3+/ Fe4+ become active in the studied voltage range, as confirmed by X-ray absorption spectroscopy. The thermal stability of charged cathodes was investigated by differential scanning calorimetry. Although the total heat generated by the fully charged Na0.25Fe1/3Mn 2/3O2 is larger than that of the Li0.5CoO 2 used as a reference, it is remarkably stable up to ca. 320 °C. © Published by Elsevier B.V.

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Author Profiles

Sakurako Okada
Jiayixiu Zhao
University of Nottingham
Jiaying Xu
Smith College

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