Gallium doped lithium manganese oxide spinels (LiGaxMn2xO4) as cathode material for lithium or lithium-ion rechargeable batteries with improved cycling performance

摘要

An improved process for preparing a spinel type lithium manganese composite oxide represented by the general formula (I): Li_x Mn_(2y) M_y1 B_y2 O₄ wherein M represents at least one member selected form among Al, Cr, Fe, Ni, Co, Ga, and Mg; 0.9x1.1; and yy₁y₂, wherein 0.002y0.5, 0y₁0.5, and 0.002y₂0.1 or represented by the general formula (Ia) Li_x Mn_(2y) M_y O₄, which is the same as the general formula (I) except that y₂ is 0. In formula (Ia) M and x are each as defined above and 0.002y0.5; and a cathode active material for a lithium ion rechargeable battery comprising the spinel type lithium manganese composite oxide having improved charge-discharge characteristics produce by the above method. The composite oxide thus produce is a novel one improved in cycle characterized, particularly in charge-discharge cycle characterized in a high-temperature (50 C. or above) environment, and hence is very useful form the viewpoint of industry.