The reversible oxidation of LiMnO2 to LiMn2O4 and Li2MnO3 coexisting phases has been investigated in view of its possible application as high temperature energy storage system. By means of thermoanalytical techniques information regarding the heat exchanged during both oxidation and reduction reactions have been collected and the temperature range for cyclic reduction oxidation has been explored. Initial tests regarding the cyclical operation highlight the optimal thermal stability of the mixture confirming the exploitability of the system for high temperature thermal energy storage applications. Preliminary information concerning the kinetic behavior of the powder during the reduction stage evidences a two-step mechanism. The reaction can be described through a first stage characterized by oxygen depletion from the spinel phase, followed by a major oxygen loss concomitant with the depleted LiMn2O4 and Li2MnO3 solid state transformation into LiMnO2. (C) 2016 Elsevier B.V. All rights reserved.