Quantitative analysis of Li contents in LixCoO2 cathodes via Rietveld refinement

被引：3

作者：

Rodriguez, MA ^{[1
]}

Ingersoll, D ^{[1
]}

Doughty, DH ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

POWDER DIFFRACTION | 2003年 / 18卷 / 02期

关键词：

Rietveld; LixCoO2; lithium; cobalt; oxide; Li-ion battery;

D O I：

10.1154/1.1528195

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Rietveld refinement of LixCoO2-type cathodes (where x=0.59-1.00) has been demonstrated to yield quantitative information about the Li occupancy with an error of about similar to 10%. With careful X-ray diffraction (XRD) data collection, refinement, and proper calibration, accurate values can be obtained. Rietveld refinement tends to under-predict the Li occupancy values in charged (de-lithiated) cathodes as compared to ICP measurements. A Li-gradient model that assumes a decreasing concentration of Li from the particle core to its surface is discussed to explain this observation. The observed lattice parameters for the fully lithiated LiCoO2 standard phase (R-3m symmetry) were a= 2.8155(1) Angstrom, c= 14.052(1) Angstrom. The error convention used in this paper is 3sigma of standard deviations obtained from Rietveld refinement output. (C) 2003 International Centre for Diffraction Data.

引用

页码：135 / 139

页数：5

共 8 条

[1]

Doughty DH, 1996, SAMPE J, V32, P75

[2]

IBERS JA, 1974, INT TABLES XRAY CRYS, V4, P71

[3] Taking charge of the 21st century [J].