Fine cathode particles prepared by solid-state reaction method using nano-sized precursor particles

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 LiCo_1-xMn_xO₂ (0.1 ≤ x ≤ 0.3) particles had finer size than that of the pure LiCoO₂ particles. Manganese component disturbed the growth of the LiCo_1-xMn_xO₂ 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 LiCo_1-xMn_xO₂ (0.1 ≤ x ≤ 0.3) cathode particles decreased with increasing the contents of the manganese component. The discharge capacities of the LiMn_2-yCo_yO₄ (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 119 mAh g^-1.