期刊
ELECTROCHEMISTRY
卷 80, 期 10, 页码 716-719出版社
ELECTROCHEMICAL SOC JAPAN
DOI: 10.5796/electrochemistry.80.716
关键词
Sodium Insertion; Iron Oxides; Sodium Batteries
资金
- Japan Society for the Promotion of Science (JSPS)
- Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) [24750186]
- MEXT, Nanotechnology Support Project [2011B1729]
- Grants-in-Aid for Scientific Research [24750186] Funding Source: KAKEN
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 mAhg(-1) of reversible capacity with a nearly flat voltage profile at approximately 3.3V 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. (C) The Electrochemical Society of Japan, All rights reserved.
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