On the role of faradaic and capacitive contributions in the electrochemical performance of CoFe2O4 as conversion anode for Li-ion cells

被引：43

作者：

Vidal-Abarca, C. ^{[1
]}

Lavela, P. ^{[1
]}

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

机构：

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

来源：

SOLID STATE IONICS | 2010年 / 181卷 / 13-14期

关键词：

Faradaic; Capacitive; Mossbauer spectroscopy; Lithium; ELECTRODE MATERIALS; MAGNETIC-PROPERTIES; NEGATIVE-ELECTRODE; LITHIUM; ALPHA-FE2O3; REACTIVITY; BATTERIES;

D O I：

10.1016/j.ssi.2010.02.028

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CoFe2O4 samples were synthesized by the reverse micelles procedure. The electrochemical performance of the studied samples was explained in terms of capacitive and faradaic contributions to charge storage, by using SPES at several sweep rates. The faradaic storage mechanism was considered as the main contribution to global capacity, while the capacitive component has a positive effect on the kinetic response. Fe-57 Mossbauer spectra of recorded samples revealed that core iron plays an important role to prolong the faradaic redox reaction for a large number of cycles at high capacity values. The best performance was recorded for the sample prepared in strong alkaline medium and annealed at 800 degrees C. Capacity values of ca. 600 mAh/g were recorded after 100 cycles. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：616 / 622

页数：7

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