Crystal structure studies of thermally aged LiCoO2 and LiMn2O4 cathodes

被引：53

作者：

Gabrisch, Heike ^{[1
]}

Ozawa, Yasunori

Yazami, Rachid

机构：

[1] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA

[2] CALTECH, CNRS, Int Lab Mat Electrochem Energet, Div Engn & Appl Sci, Pasadena, CA 91125 USA

来源：

ELECTROCHIMICA ACTA | 2006年 / 52卷 / 04期

基金：

美国国家科学基金会;

关键词：

rechargeable Li-ion batteries; self discharge; LiMn2O4; LiCoO2; electron diffraction;

D O I：

10.1016/j.electacta.2006.02.050

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

LiCoO2 and LiMn2O4 cathodes Were Studied by X-ray diffractometry (XRD) and electron diffraction after ageing in the charged state at elevated temperature. Some cathodes were stopped at different times during ageing and XRD measurements were taken to monitor changes in the crystal structure over ageing time. The results indicate that Li-ions intercalate into the cathodes lattice during ageing thus decreasing the available discharge capacity. Analysis of electron diffraction patterns of LiCoO2 and LiMn2O4 retrieved from the cathodes after ageing shows that irreversible crystallographic transformations have taken place in both electrodes. Dark field imaging illustrates that LiCoO2 forms a layer of spinel phase on its surface. In LiMu(2)O(4) a tetragonal distorted spinel is observed when the cathode has been in the 3 V regime for considerable length of time. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1499 / 1506

页数：8