The present disclosure relates to a positive active material, a method of preparing the same, and a lithium secondary battery having a positive electrode including the positive active material, the positive active material including: a lithium transition metal oxide having a portion of Li substituted by Na, and including Ni and Co; and a cobalt-containing coating layer arranged on the surface of the lithium transition metal oxide particle, wherein the lithium transition metal oxide particle includes a concentration gradient region in which the concentration of Co decreases in a direction from the surface to the center of the particle.

The present disclosure relates to a positive electrode active material, a method of preparing the same, and a lithium secondary battery having a positive electrode including the same. The positive electrode active material includes: a lithium transition metal oxide particle in which a portion of Li is substituted with Na, and which includes Ni and Co atoms, wherein the lithium transition metal oxide particle includes a concentration gradient region in which the concentration of Co atoms decreases from the surface toward the center of the particle.

The present disclosure discloses a W-containing high-nickel ternary cathode material, including both spherical secondary particles and single-crystal particles. There is basically no W inside the single-crystal particles, and the spherical secondary particles are doped with W. A preparation method of the W-containing high-nickel ternary cathode material includes: mixing a nickel salt, a cobalt salt, and a manganese salt according to a specified molar ratio, and adding an ammonia solution and a sodium hydroxide solution for co-precipitation to prepare a precursor A; mixing a nickel salt, a cobalt salt, a manganese salt, and a tungsten salt, and adding an ammonia solution and a sodium hydroxide solution for co-precipitation to prepare a W-containing precursor B; and mixing the precursor A, the precursor B, a lithium source, and a doping element M-containing compound, and subjecting a resulting mixture to high-temperature sintering in an oxygen atmosphere to obtain the high-nickel ternary cathode material including both spherical secondary particles and single-crystal particles. While increasing the capacity, the spherical secondary particles in the product of the present disclosure can ensure that a crystal structure will not undergo obvious phase transition when lithium ions are deintercalated during a cycling process, which helps to improve the cycling performance.

Provided are a positive active material for a lithium secondary battery, a method of preparing the positive active material, a positive electrode for a lithium secondary battery including the positive active material, and a lithium secondary battery including a positive electrode including the positive active material, in which the positive active material may include a nickel-based lithium metal oxide secondary particle including a plurality of large primary particles, the nickel-based lithium metal oxide secondary particle may have a hollow structure having a pore inside, a size of each of the large primary particles may be in a range of about 2 micrometers (μm) to about 6 μm, and a size of the nickel-based lithium metal oxide secondary particle may be in a range of about 10 μm to about 18 μm.

The present disclosure relates to a positive electrode active material, a method of manufacturing the same, and a lithium secondary battery including a positive electrode including the same. The positive electrode active material includes: a lithium transition metal oxide particle in which a portion of Li is substituted with Na, and which includes Ni and Co atoms; and a phosphorus-containing coating layer disposed on the surface of the lithium transition metal oxide particle, wherein the lithium transition metal oxide particle includes a concentration gradient region in which the concentration of Co atoms decreases from the surface toward the center of the particle.

A process for producing a surface-modified particulate lithium nickel metal oxide material is provided. The process comprises the dry mixing lithium nickel metal oxide particles with at least one metal-containing compound using acoustic energy and then calcining the mixture at a temperature of less than or equal to 800 # C.

This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li.sub.1+a[Ni.sub.xCo.sub.yMn.sub.zM.sub.bM′.sub.c]O.sub.2−dY.sub.d, where distribution of each of the doping elements M, M′, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.

A lithium battery positive active material precursor, a preparation method therefor and the use thereof are provided. The precursor has a chemical formula of Ni.sub.xCo.sub.yM.sub.z(OH).sub.2, wherein M is at least one metal selected from the group consisting of Fe, Cr, Cu, Ti, Mg, W, Mo, Nb, Zn, Sn, Zr, Ga, Mn and Al, 0.3≤x≤1, 0<y≤0.5, 0<z≤0.3; and the precursor comprises aggregates of platy monocrystals and polyhedral monocrystal particles. In the XRD pattern of the precursor, I(001), I(100) and I(101) satisfy the following relationship: I(001)/I(100) is not less than about 1.5, and I(001)/I(101) is not less than about 1.2.

The invention provides a positive electrode active material for a lithium ion battery, comprising a lithium transition metal-based oxide powder, the powder comprising single crystal monolithic particles comprising Ni and Co and having a general formula Li.sub.1+a ((Ni.sub.z (Ni.sub.1/2 Mn.sub.1/2).sub.y Co.sub.x).sub.1−kA.sub.k).sub.1-a 02, wherein A is a dopant, −0.02<a≤0.06, 0.10≤x≤0.35, 0≤z≤0.90, x+y+z=1 and k≤0.01, the particles having a cobalt concentration gradient wherein the particle surface has a higher Co content than the particle center.

A positive electrode active material for a lithium ion battery comprises a lithium transition metal-based oxide powder, the powder comprising single crystal monolithic particles comprising Ni and Co and having a general formula Li.sub.1+a (Ni.sub.z Mn.sub.y Co.sub.x Zr.sub.q A.sub.k).sub.1−a O.sub.2, wherein A is a dopant, −0.025≤a<0.005, 0.60≤z≤0.95, y≤0.20, 0.05≤x≤0.20, k≤0.20, 0≤q≤0.10, and x+y+z+k+q=1. The particles have a cobalt concentration gradient wherein the particle surface has a higher Co content than the particle center.