Abstract: Spherical MnO₂ powders were prepared by the redox method at room temperature.The spherical spinel LiMn₂O₄ powders were synthesized by sintering the MnO₂ precursor mixed with LiOH·H₂O by controlling the molar ratio of metal ions Li+: Mn²⁺ at 750℃ for 8h.The structures and morphologies of MnO₂ and LiMn₂O₄ were characterized by XRD and SEM.And the spherical LiMn₂O₄ cathode material was measured by electrochemical test of chargedischarge.The results show that the spherical LiMn₂O₄ particles which are sized as 4μm uniformly have excellent dispersty and mobility.The initial charge capacity and discharge capacity of sample are 130.5 mAh·g^-1 and 128.2 mAh·g^-1 respectively with the charge-discharge efficiency of 98.2%.After 50 cycles,the retention of capacity is 90%.The spherical spinel LiMn₂O₄ has both higher specific capacity and excellent cycleability.