Impedance analysis of Na0.44MnO2 positive electrode for reversible sodium batteries in organic electrolyte

被引：69

作者：

Ruffo, Riccardo ^{[1
]}

Fathi, Reza ^{[1
]}

Kim, Dong Jun ^{[2
]}

Jung, Young Hwa ^{[2
]}

Mari, Claudio M. ^{[1
]}

Kim, Do Kyung ^{[2
]}

机构：

[1] Univ Milano Bicocca, Dept Mat Sci, I-20125 Milan, Italy

[2] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

来源：

ELECTROCHIMICA ACTA | 2013年 / 108卷

基金：

新加坡国家研究基金会;

关键词：

Sodium manganese oxide; Cathode material; Sodium ion batteries; Impedance spectroscopy; Solid state diffusion; ELECTROCHEMICAL INTERCALATION; MANGANESE OXIDE; ION; NANOWIRES; CATHODE;

D O I：

10.1016/j.electacta.2013.07.009

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Na0.44MnO2 (NMO) is one of the most promising positive electrode materials for the development of sodium ion secondary batteries. In this work, a NMO orthorhombic compound was prepared by a soft chemistry modified Pechini method and characterized. The material exhibits a good discharge capacity (about 110 mAh/g) at low current rate (11 mA/g, C/25) which decreases to 65 mAh/g at high rate (275 mA/g, 1C). The electrochemical behavior was investigated by the extensive use of electrochemical impedance spectroscopy analysis. It was observed that the kinetic limitations are mainly due to the low diffusion coefficient of Na+ ions in the structure (in the range 10(-13)/10(-14) cm(2)/s) and to the high values of the surface resistance which is the sum of two contributes attributed to the charge transfer process and the presence of a passivating layer. The diffusion coefficient as well as the charge transfer resistance depends on the sodium amount in the electrode. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：575 / 582

页数：8

共 29 条

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