LiNi_0.5Co_0.5O₂ powder as a positive electrode material for lithium-ion batteries is systhesized by the emulsion method. LiOH·H₂, Ni(CH₃COO)₂·4H₂O and Co(CH₃COO)₂·4H₂O aqueous solution, kerosene, and span-80 are used as aqueous phase, oil phase and emulsifying agent. Weight loss of the precursor powder occurs rapidly below 400℃ and the formation of LiNi_0.5Co_0.5O₂ phase is starting. The heating condition for obtaining pure LiNi_0.5Co_0.5O₂ phase is above 750℃ for 12hr. Obtained powder shows very uniformly size distribution around 10㎛, and good electrochemical characteristics.