Understanding the voltage profile of Li insertion into LiNi0.5-yFeyMn1.5O4 in Li cells

被引：7

作者：

Vicente, CP ^{[1
]}

Lloris, JM ^{[1
]}

Tirado, JL ^{[1
]}

机构：

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

来源：

ELECTROCHIMICA ACTA | 2004年 / 49卷 / 12期

关键词：

cathode material; lithium-ion battery; nickel-iron-manganese oxides; 5 V electrode; voltage modelization;

D O I：

10.1016/j.electacta.2003.12.025

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

LiNi0.5-yMyMn1.5O4 compounds have proven to be of great interest as active cathode material for high-voltage lithium-ion cells. The electrochemical behavior of LiNi0.5-yFeyMn1.5O4 compounds as cathode material in lithium cells is studied here. The charge-discharge curves are characterized by three main plateaus, ascribable to the removal (during charge) or filling (during discharge) of d electrons corresponding to the different redox pairs present: Fe-IV/Fe-III, Ni-IV/Ni-II and Mn-IV/Mn-III. Taking into account the entropy associated to the lithium extraction/insertion and the filling of the different electronic levels, the modelization gives a good reproducibility of the experimental electrochemical curves. The standard potential go of the redox pairs were estimated to be ca. -4.90, -4.80 and -4.23 eV, respectively. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：1963 / 1967

页数：5

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