Fine-sized Li-Co-Mn-O cathode particles with various ratios of cobalt and manganese components were prepared by conventional solid-state reaction method using the nano-sized precursor particles. The nano-sized precursor particles of cobalt and manganese components were prepared by spray pyrolysis. The LiCo1-xMnxO2 (0-1 <= x <= 0.3) particles had finer size than that of the pure LiCoO2 Particles. Manganese component disturbed the growth of the LiCo1-xMnxO2 cathode particles prepared by solid-state reaction method. The pure LiCoO2 cathode particles had high initial discharge capacity of 144 mAh g(-1). However, the initial discharge capacities of the LiCo1-xMnxO2 (0.1 <= x <= 0. 3) cathode particles decreased with increasing the contents of the manganese component. The discharge capacities of the LiMn2-yCoyO4 (0 <= y <= 0.2) cathode particles decreased abruptly with increasing the contents of the cobalt component. The pure LiMn204 cathode particles had the initial discharge capacities of 119 mAh g(-1). (C) 2007 Elsevier B.V. All rights reserved.