Elucidation of Capacity Fading on CoFe2O4 Conversion Electrodes for Lithium Batteries Based on 57Fe Mossbauer Spectroscopy

被引：25

作者：

Lavela, P. ^{[1
]}

Tirado, J. L. ^{[1
]}

Womes, M. ^{[2
]}

Jumas, J. C. ^{[2
]}

机构：

[1] Univ Cordoba, Lab Quim Inorgan, E-14071 Cordoba, Spain

[2] Univ Montpellier 2, Inst Charles Gerhardt, UMR 5253, Equipe Agregats Interfaces & Mat Energie, F-34095 Montpellier 5, France

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 07期

关键词：

FERRITE THIN-FILMS; MAGNETIC-PROPERTIES; NEGATIVE-ELECTRODE; REVERSE MICELLES; ANODE MATERIAL; ION; OXIDE; MICROSCOPY; REACTIVITY; PARTICLES;

D O I：

10.1149/1.3129691

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Two CoFe2O4 samples prepared at 600 and 1000 degrees C have been subjected to galvanostatic cycling in lithium test cells. Fe-57 Mossbauer spectra have been analyzed to elucidate the possible causes of capacity fading during the first cycles. Fe-57 conversion electron Mossbauer spectroscopy has been applied to distinguish between bulk and surface iron locations. This technique revealed the presence of reduced iron atoms near the surface of the sample annealed at 1000 degrees C. Their suitable accessibility to lithium may explain the better capacity retention observed for a large number of cycles. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3129691] All rights reserved.

引用

页码：A589 / A594

页数：6

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