Surface structure of LiMn2O4 electrodes

被引：37

作者：

Eriksson, T ^{[1
]}

Gustafsson, T ^{[1
]}

Thomas, JO ^{[1
]}

机构：

[1] Uppsala Univ, Angstrom Lab, SE-75121 Uppsala, Sweden

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2002年 / 5卷 / 02期

关键词：

D O I：

10.1149/1.1432782

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The chemical composition of LiMn2O4 electrode surfaces has been determined by X-ray photoelectron spectroscopy and compared with the results of X-ray diffraction studies to expose differences between bulk and surface structure in electrodes cycled or stored at room temperature. The surface of electrodes discharged to Li2Mn2O4 contains only Mn3+ although the bulk phase also contains a component of LiMn2O4 phase. On the other hand, both Mn3+ and Mn4+ are found oil the surface of an electrode delithiated to phase-pure lambda-MnO2. Electrodes cycled or stored exhibit a Mn3+-rich surface, contrary to the bulk structure. It is concluded that Li2Mn2O4 or some defect spinel-type structure with averaged Mn oxidation state below 3.5 is formed on the electrode surface. (C) 2001 The Electrochemical Society.

引用

页码：A35 / A38

页数：4

共 37 条

[21] Electrochemical quartz crystal microbalance for insertion/extraction of lithium in spinel LiMn2O4 thin films [J].