Stability of the monoclinic and orthorhombic phases of LiMnO2 with temperature, oxygen partial pressure, and Al doping

被引：41

作者：

Jang, YI

Chiang, YM

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Ctr Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

SOLID STATE IONICS | 2000年 / 130卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

lithium batteries; lithium manganese oxides; phase stability; solid solubility; Jahn-Teller distortion;

D O I：

10.1016/S0167-2738(00)00310-6

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：

The monoclinic and orthorhombic ordered-rocksalt polymorphs of LiMnO2 are of interest as high-capacity cathode materials for rechargeable Li batteries. The relative stability of the monoclinic and orthorhombic phases has been studied as a function of firing temperature, oxygen partial pressure, and Al doping. Control of temperature and oxygen partial pressure is crucial in order to obtain the LiAlyMn1-yO2 phases while minimizing impurity phases such as LiMn2O4, Li2MnO3, and Mn3O4. The solid solubility of Al in LiMnO2 has been determined to reach a maximum of 5-7% at 950 degrees C and P-O2 = 10(-7) atm. The existence of a maximum in Al solid solubility is attributed to the competing stability of gamma-LiAlO2 at higher temperatures. A phase stability mechanism for the monoclinic phase upon Al-doping is proposed. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：53 / 59

页数：7

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