| CPC H01M 4/525 (2013.01) [C01G 53/04 (2013.01); H01M 4/0471 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 12 Claims |
|
1. A nickel composite hydroxide, which is composed of secondary particles to which plural primary particles are aggregated,
wherein the nickel composite hydroxide comprises a nickel, a cobalt, a manganese, and optionally an element M with an atomic ratio of Ni:Co:Mn:M=1−x1−y1−z1:x1:y1:z1 (wherein M is at least one element selected from a group consisting of a transition metal element other than Ni, Co, Mn, a II group element, and a XIII group element, 0.15≤x1≤0.25, 0.15≤y1≤0.25, 0≤z1≤0.1),
the nickel composite hydroxide has:
a cobalt rich layer or a manganese rich layer from a surface of a particle of the secondary particles toward an inside of the particle of the secondary particles, and
a low-density layer that is layered between the cobalt rich layer or the manganese rich layer and a center of the particle of the secondary particles, the low-density layer having a lower mass density relative to the remainder of the particle,
the cobalt rich layer comprises a nickel, a cobalt, a manganese, and optionally an element M with an atomic ratio of Ni:Co:Mn:M=1−x2−y2−z2:x2:y2:z2 (wherein M is at least one element selected from a group consisting of a transition metal element other than Ni, Co, Mn, a II group element, and a XIII group element, x2 and y2 satisfy x2=1 and y2=0 or x2/(1−x2−y2−z2)+y2)≥1, and z2 is within a range of 0≤z2≤0.1),
the manganese rich layer comprises a nickel, a cobalt, a manganese, and optionally an element M with an atomic ratio of Ni:Co:Mn:M=1−x2−y2−z2:x2:y2:z2 (wherein M is at least one element selected from a group consisting of a transition metal element other than Ni, Co, Mn, a II group element, and a XIII group element, x2 and y2 satisfy x2=0 and y2=1 or y2/((1−x2−y2−z2)+x2)≥1, and z2 is within a range of 0≤z2≤0.1),
a thickness of the cobalt rich layer is 1% or more and less than 10% with respect to a diameter of the secondary particles or a thickness of the manganese rich layer is 1% or more and 10% or less with respect to the diameter of the secondary particles, and
a thickness of the low-density layer is 1% or more and 10% or less with respect to the diameter of the secondary particles.
|