Lithium Metal Composite Oxide Having Layered Structure

摘要

Provided is a lithium metal composite oxide having a layered structure, which is particularly excellent as a positive electrode active material for batteries that are mounted on electric vehicles or hybrid vehicles. Proposed is a lithium metal composite oxide having a layered structure, which is represented by general formula Li1+x(MnαCoβNiγ)1−xO2 (0.00≦X≦0.07, 0.10≦α≦0.40, 0.10≦β≦0.40, and 0.30≦γ≦0.75) and has a specific surface area of more than 2.0 m2/g but 5.0 m2/g or less and has an average particle size of the primary particles/crystallite size ratio of 5.7 to 18.5.

主权项

1. A lithium metal composite oxide having a layered structure, which is expressed by General Formula of Li1+x(MnαCoβNiγ)1−xO2 (0.00≦X≦0.07, 0.10≦α≦0.40, 0.10≦β≦0.40, and 0.30≦γ≦0.75),
wherein a specific surface area is more than 2.0 m2/g and equal to or less than 5.0 m2/g, a ratio (referred to as “average particle size of primary particles/crystallite size) of the average particle size of the primary particles, which is obtained by the following measurement method, to the crystallite size which is obtained by the following measurement method is 5.7 to 18.5, in the method of measuring the crystallite size, the crystallite size of a measurement sample (powder) is measured by using an X-ray diffraction device using Cu-kα rays, at this time, analysis is performed by employing a fundamental parameter, and the crystallite size is calculated by using analysis software on the basis of an X-ray diffraction pattern obtained from a diffraction angle (2θ) range of 15° to 120°, and in the method of measuring the average particle size of the primary particles, the average particle size of the primary particles is observed by using a scanning electron microscope at an acceleration voltage of 20 kV and a magnification of 5000 times, and an image of the primary particles in an electron microscope photograph is analyzed using image analysis software to calculate the average particle size of the primary particles.