A kinetic study of potential versus composition was conducted on orthorhombic LiMnO2 over the voltage range of 1.0 to 4.6 V with a variety of electrolyte formulations. The broad potential range enabled studying the electrochemical behaviour of the material over compositions from LiMnO2 to Li0.1MnO2. Substantial differences in the kinetics of the electrochemical processes associated with certain potential ranges were observed. Crown in right of Canada