Abstract
The monoclinic and orthorhombic ordered-rocksalt polymorphs of LiMnO 2 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 LiAl y Mn 1− y O 2 phases while minimizing impurity phases such as LiMn 2O 4, Li 2MnO 3, and Mn 3O 4. The solid solubility of Al in LiMnO 2 has been determined to reach a maximum of 5–7% at 950°C and P O 2 =10 −7 atm. The existence of a maximum in Al solid solubility is attributed to the competing stability of γ-LiAlO 2 at higher temperatures. A phase stability mechanism for the monoclinic phase upon Al-doping is proposed.
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