Synthesis and Electrochemical Properties of LiMn₂O₄ Powders by Spray Pyrolysis Using Carbonate Aqueous Solution

抄録

LiMn₂O₄ and Li_1.09Mn₂O₄ powders were prepared by spray pyrolysis with aqueous solution of manganese carbonate. The dispersion stability of manganese carbonate was influenced by pH of aqueous solution. The particle characteristics of LiMn₂O₄ and Li_1.09Mn₂O₄ powders were determined by XRD, SEM and BET. SEM photograph showed that LiMn₂O₄ powders had spherical morphology with porous microstructure and consisted of primary particles. XRD revealed that crystal phase of LiMn₂O₄ and Li_1.09Mn₂O₄ powders were good agreement with spinel phase. The dischargeable capacity of LiMn₂O₄ cathode was 125 mAh/g at 1C. The dischargeable capacity of Li_1.09Mn₂O₄ cathode was 107 mAh/g at 1C. The dischargeable capacity of Li_1.09Mn₂O₄ cathode exhibited high cycle stability compared with that of was LiMn₂O₄ cathode.