Patent ID: 11909030
Assignee: SK ON CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A cathode active material for a lithium secondary battery, comprising:
a first cathode active material particle represented by the following Chemical Formula 1;

LixM1aM2bM3cOy  [Chemical Formula 1]

wherein in Chemical Formula 1, M1, M2 and M3 independently include at least one element selected from a group consisting of Ni, Co, Mn, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga and B,
0<x≤1.1, 1.98≤y≤2.02, 0.6≤a≤0.95 and 0.05≤b+c≤0.4, and
a second cathode active material particle represented by the following Chemical Formula 2 or Formula 3;

LixNiaCobMncM4dM5eOy  [Chemical Formula 2]

wherein in Chemical Formula 2, M4 includes at least one element selected from a group consisting of Ti, Zr, Al, Mg, and Cr; and M5 includes at least one element selected from a group consisting of Sr, Y, W, and Mo; and
0<x<1.5, 1.98≤y≤2.02, 0.313≤a≤0.353, 0.313≤b≤0.353, 0.313≤c≤0.353, 0≤d≤0.03, 0≤e≤0.03, and 0.98≤a+b+c≤1.02,

LixNiαCoβMnγM4δM5εOy  [Chemical Formula 3]

wherein in Chemical Formula 3, M4 includes at least one element selected from a group consisting of Ti, Zr, Al, Mg, and Cr; and M5 includes at least one element selected from a group consisting of Sr, Y, W, and Mo; and
0<x<1.1, 1.98≤y≤2.02, 0.48≤α≤0.52 0.18<β≤0.27, 0.24≤γ≤0.32, 0≤δ≤0.03, 0≤ε≤0.03, and 0.98≤α+β+γ≤1.02,
wherein metal elements except for lithium included in the second cathode active material particle do not have a concentration gradient region between a central portion of the second cathode active material particle and a surface of second cathode active material particle,
wherein the second cathode active material particle includes primary particles being aggregated with each other, the primary particles having different shapes or crystalline structures from each other,
wherein the different shapes include a first shape including a granular shape or a spherical shape and a second shape including a rod shape or a needle shape,
wherein the second cathode active material particle includes a first particle arranged in a central region and a second particle arranged in a peripheral region, and the first particle and the second particle have the different shapes or crystalline structures from each other.