Lithium composite metal oxide, positive electrode active substance, positive electrode, and non-aqueous electrolyte secondary battery

摘要

A lithium composite metal oxide that contains Li, Ni, and Mn, has a layered structure, has a diffraction peak in a range of 2θ=20.8±1° in a powder X-ray diffraction pattern obtained with powder X-ray diffraction measurement using a Cu—Kα radiation, has a BET specific surface area in a range of 6 m2/g to 30 m2/g, and has an average particle diameter measured with a laser diffraction scattering method in a range of 0.1 μm to 10 μm.

主权项

1. A lithium composite metal oxide which
contains Li, Ni, and Mn, has a lamellar structure, has a diffraction peak in a range of 2θ=20.8±1° in a powder X-ray diffraction pattern obtained through powder X-ray diffraction measurement using a Cu—Kα radiation, has a BET specific surface area of from 6 m2/g to 30 m2/g, and has an average particle diameter measured by a laser diffraction scattering method of from 0.1 μm to 10 μm, and wherein the lithium composite metal oxide is represented by Formula (B) described below
nLi2b/3MnO3.(1−n)Lib/3Ni1-p-qMnpMqO2  (B), wherein in Formula (B) 0.2≦n≦0.6, 2.75≦b<3.0, 0.25≦p≦0.5, 0≦q≦0.31, 0.38≦p+q≦0.5, and M represents one or more elements selected from the group consisting of Co, Fe, Mg, Al, and Ca.