Abstract: Layered LiMnO2 and spinel LiMn2O4 were compared on specific capacity，initial efficiency，storage at high tem-perature，and cycle performance.Results showed that the layered LiMnO2 had higher capacity，but its performance of storage at high temperature was not better than spinel LiMn2O4.On cyclic performance at high temperature，because manganese dissolved at high temperature，both layered LiMnO2 and spinel LiMn2O4 had bad performance，their capacity retention ratios were below 80% after 400 cycles at 0.5C.In respect of cycles at room temperature，the spinel LiMn2O4 had better capacity retention.Finally，on the using at power battery，spinel LiMn2O4 had better advantage than layered LiMnO2.

Key words: lithium manganate, capacity retention, storage at high temperature, cycle