An alluaudite Na2+2xFe2-x(SO4)3(x=0.2) derivative phase as insertion host for lithium battery

被引：55
作者：
Ming, Jun [1 ,3 ]
Barpanda, Prabeer [1 ,2 ,3 ]
Nishimura, Shin-ichi [1 ,3 ]
Okubo, Masashi [1 ,3 ]
Yamada, Atsuo [1 ,3 ]
机构：
[1] Univ Tokyo, Grad Sch Engn, Dept Chem Syst Engn, Tokyo 1138656, Japan
[2] Indian Inst Sci, Mat Res Ctr, Faraday Mat Lab, Bangalore 560012, Karnataka, India
[3] Kyoto Univ, ESICB, Unit Element Strategy Initiat Catalysts & Batteri, Kyoto 6158510, Japan
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2015年 / 51卷
关键词：
Lithium batteries; Sodium batteries; Cathode; Alluaudite; Oxidation; IRON PYROPHOSPHATE; ION; CATHODE;
D O I：
10.1016/j.elecom.2014.11.009
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A new desodiated derivative compound, Na0.89Fe1.8(SO4)(3), was prepared by the chemical oxidation of alluaudite Na2.4Fe1.8(SO4)(3) Phase using NOBF4 as oxidant. The structure and valency of Fe were characterized by X-ray diffraction (XRD) and Fe-57 Mossbauer spectroscopy. Intercalation behavior of lithium ions in the structure of Na0.89Fe1.8(SO4)(3) was gauged by electrochemical analyses and ex-situ X-ray diffraction. A high capacity of 110 mAh g(-1) at 0.1 C was obtained with a good rate kinetics within a range of 0.1-10 C(1 C = 118 mAh g-1) involving a high Fe3+/Fe2+ redox potential of 3.75 V (vs. Li/Li+). These results confirmed that the Na2.4-delta Fe1.8(SO4)(3) framework was stable even after oxidation and forms a new competitive cathode for the reversible intercalation of lithium ions. (C) 2014 Elsevier B.V. All rights reserved.
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页码：19 / 22
页数：4
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