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−x Mn x O2 (0.1≤ x ≤0.3) particles had finer size than that of the pure LiCoO2 particles. Manganese component disturbed the growth of the LiCo1−x Mn x O2 cathode particles prepared by solid-state reaction method. The pure LiCoO2 cathode particles had high initial discharge capacity of 144mAhg−1. However, the initial discharge capacities of the LiCo1−x Mn x O2 (0.1≤ x ≤0.3) cathode particles decreased with increasing the contents of the manganese component. The discharge capacities of the LiMn2−y Co y O4 (0≤ y ≤0.2) cathode particles decreased abruptly with increasing the contents of the cobalt component. The pure LiMn2O4 cathode particles had the initial discharge capacities of 119mAhg−1.