Spinel LiMn2O4 as a cathode material for lithium rechargeable batteries is prepared at the low temperature of 250°C without any artificial mixing procedures of reactants. The phase transitions of lithium manganese oxide are found three times on heating at 250°C. The prepared material exhibits the initial discharge capacity of 85.5mAhg−1 and the discharge capacity retention of 91.5% after 50 cycles.