Lithium-ion cell based on orthorhombic LiMnO2

This paper will demonstrate that cathodes based on the high temperature form of orthorhombic LiMnO2, with the structure described by Hoppe, Brachtel and Jansen, have good capacity and cycle life. X-ray diffraction studies have revealed that cathodes prepared from orthorhombic LiMnO2 undergo a structural change on being charged beyond a certain potential in which the original structure is converted to spinel Li1−xMn2O4. Orthorhombic LiMnO2 has been found to have long-term stability in ambient conditions and is easily prepared in a one-step reaction.