Ionic and Electronic Transport in Alluaudite Na2+2xFe2-x(SO4)3

被引：40

作者：

Lu, Jiechen ^{[1
]}

Yamada, Atsuo ^{[1
,2
]}

机构：

[1] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan

[2] Kyoto Univ, ESICB, Unit Element Strategy Initiat Catalysts & Batteri, Kyoto 6158510, Japan

来源：

CHEMELECTROCHEM | 2016年 / 3卷 / 06期

关键词：

alluaudite; cathodes; high-rate capability; ionic conductivity; sodium-ion batteries; LITHIUM BATTERIES; CATHODE MATERIAL; PHASE-DIAGRAM; SODIUM; ELECTROCHEMISTRY; CHEMISTRY; FEPO4;

D O I：

10.1002/celc.201500535

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Alluaudite-type Na2+2xFe2-x(SO4)(3) has recently been discovered as a 3.8 V (highest ever Fe3+/Fe2+ redox potential) cathode material for sodium-ion batteries. Contrary to the sluggish kinetics caused by the large Na+ radius in most cathode materials for sodium-ion batteries, this alluaudite-type compound shows superior high-rate capability during electrochemical cycling. Here, to explore the underlying factors for the fast kinetics, we experimentally investigate the inherent ionic and electronic transport of this alluaudite phase by using impedance spectroscopy and potentiostatic polarization. Compared with the commercial cathode material, LiFePO4, we demonstrate four and two orders of magnitude higher intrinsic ionic and electronic conductivity, respectively, which underpin its superior high-rate capability in terms of electrode performance.

引用

页码：902 / 905

页数：4

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