| abstract |
Disclosed is a surface-modified lithium-containing complex oxide which has excellent discharge capacity, volumetric capacity, safety, charge/discharge cycle durability and high rate characteristics. Specifically disclosed is a surface-modified lithium-containing complex oxide which contains lithium-titanium complex oxide that contains lithium, titanium and element Q (Q represents one element selected from a group consisting of B, Al, Sc, Y and In) in the surface layers of lithium-containing complex oxide particles having a specific composition. The lithium-titanium complex oxide is contained in the surface layer of each particle in such an amount that the total of titanium and the element Q in the lithium-titanium complex oxide contained in the surface layer is 0.01-2 mol% of the lithium-containing complex oxide particle. The lithium-titanium complex oxide has a peak within a range where the diffraction angle 2theta is 43.8 +- 0.5 DEG in the powder X-ray diffraction analysis using a Cu-K alpha ray. |