Hydrothermal Synthesis of Nanosized LiMnO[sub 2]–Li[sub 2]MnO[sub 3] Compounds and Their Electrochemical Performances

Nanosized compounds were synthesized by a hydrothermal method. The contents of and in these compounds vary with the employed molar ratio of starting materials [i.e., ]. The effects of the reaction time and temperature on the hydrothermal products were investigated. The hydrothermally prepared compounds have higher electrochemical activities compared to those obtained from conventional solid-state reaction at high temperature [e.g., during the initial discharging process at , (sample LMO-1) and (sample LMO-4) delivered at 184 and , respectively]. Meanwhile, such nanosized compounds exhibited good rate capabilities (e.g., at a current density of , sample LMO-4 delivered a capacity of , 84% of that obtained at ). Comparison of electrochemical performances among the four nanosized compounds obtained from our hydrothermal conditions indicates that the has the higher discharge capacity while the shows the better cyclability.