Understanding structural defects in lithium-rich layered oxide cathodes

被引：72

作者：

Jarvis, Karalee A. ^{[1
]}

Deng, Zengqiang ^{[1
]}

Allard, Lawrence F. ^{[2
]}

Manthiram, Arumugam ^{[1
]}

Ferreira, Paulo J. ^{[1
]}

机构：

[1] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, High Temp Mat Lab, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 23期

关键词：

ION BATTERIES; LOCAL-STRUCTURE; ELECTRON-MICROSCOPY; SOLID-SOLUTION; DISORDER; LI2MNO3; MN; NI; CO;

D O I：

10.1039/c2jm30575e

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：

Planar defects in lithium-rich layered oxides were examined by aberration-corrected scanning transmission electron microscopy (STEM) to understand their formation. Planar defects were found to form during the transition of the transition metal layer from a disordered R (3) over barm state to a lithium-ordered C2/m state. This disorder-to-order transition resulted in three orientation variants, namely [100], [110], and [1 (1) over bar0]. The fundamental mechanism behind the observed defects is a shear of +/-b/3[010] on the (001) transition metal planes, which is equivalent to the point group operations lost during the disorder-to-order transition. These displacements also produced twins and single unit cells with P3(1)12 symmetry. Lithium-rich layered oxides with and without nickel show the presence of these three orientation variants.

引用

页码：11550 / 11555

页数：6

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