This paper investigates the role of stacking fault (5%, 20% and 50%) morphology Li2MnO3 lamellar materials, issued from coprecipitation method with three annealing temperatures, on surface reactivity. The structure have been characterized by XRD, SEM TEM. We studied reactivity these materials combining X-ray photoemission spectroscopy (XPS), gaseous adsorption first-principle calculations. An e...