アルファ型NaFeOの結晶構造とナトリウムイオン電池用正極特性
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概要
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Single phase, well-crystallized O3-type NaFeO2 (alpha NaFeO2) is prepared by a solid-state method. Electrode performance of O3-type NaFeO2 is examined as positive electrode materials for rechargeable sodium batteries. O3-type NaFeO2 can deliver 80–100 mAh g−1 of reversible capacity with a nearly flat voltage profile at approximately 3.3 V vs. Na metal. The electrode performance is significantly deteriorated by oxidation beyond x > 0.5 in Na1−xFeO2. X-ray diffraction study reveals that loss of electrode reversibility originates from irreversible structural change, possibly accompanied by iron ion migration in layered host structures. The sodium ion insertion into the host structures would be disturbed by the irreversible structural change when charged beyond x > 0.5 in Na1−xFeO2. Acceptable cyclability is, therefore, achieved for O3-type NaFeO2 as the positive electrode materials in the limited composition of x = 0–0.45 in Na1−xFeO2.
著者
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Yabuuchi Naoaki
Department Of Applied Chemistry Tokyo University Of Science
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Komaba Shinichi
Department Of Applied Chemistry And Molecular Science Faculty Of Engineering Iwate University
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Yoshida Hiroaki
Department Of Aeronautics And Astronautics Graduate School Of Engineering Kyoto University
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YABUUCHI Naoaki
Department of Applied Chemistry, Tokyo University of Science
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KOMABA Shinichi
Department of Applied Chemistry, Tokyo University of Science
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