Non-stoichiometric lithium manganate fine powders were continuously produced by internal combustion-type spray pyrolysis. As-prepared particles were crystallized to a spinel structure with a Fd3m space group. The crystal phase and morphology of as-prepared particles were influenced by the flame temperature during pyrolysis. When the flame temperature was more than 1000degreesC, the crystal phase of Mn2O3 was observed. The discharge capacity of a lithium secondary battery was about 110 mAh/g at the rate of 1 C. The discharge capacity of a lithium secondary battery decreased at the rate of 1 to 9 C, but exhibited stable cycle performance at the rate of 9 C.