| 摘要 |
Disclosed is a highly safe surface-modified lithium-containing complex oxide for positive electrode active material of lithium ion secondary batteries, which has excellent volumetric capacity, charge/discharge cycle durability and rate characteristics. A method for producing the surface-modified lithium-containing complex oxide is also disclosed. Particles of a lithium-containing complex oxide represented by the following formula: LiNMOF(wherein N represents at least one element selected from the group consisting of Co, Mn and Ni; M represents at least one element selected from the group consisting of transition metal elements other than N, Al, Sn and alkaline earth metal elements; 0.9 <= p <= 1.3; 0.9 <= x <= 2.0; 0 <= y <= 0.1; 1.9 <= z <= 4.2; and 0 <= a <= 0.05) are impregnated with a solution containing a lanthanoid source and a titanium source and then heat-treated at 550-1000°C, thereby producing a surface-modified lithium-containing complex oxide containing, in the surface layers of the particles, a highly crystalline lithium-lanthanoid-titanium complex oxide having a perovskite structure and containing no fluorine. |
