A positive electrode active material includes a lithium composite metal oxide including nickel, cobalt, manganese, and aluminum. The positive electrode active material includes 85 mol % to 97 mol % of nickel, and 2 mol % to 5 mol % of cobalt, with respect to the total number of moles of metals other than lithium, and satisfies Expression (1): 0.25I.sub.550/I.sub.7000.4. In Expression (1), I.sub.700 and I.sub.550 are respectively a maximum value of a peak intensity appearing in a range of 600 ppm to 800 ppm and a maximum value of a peak intensity appearing in a range of 450 ppm to 650 ppm when a spectral analysis (peak deconvolution) is performed on a 1D NMR center band spectrum extracted from a 2D .sup.7Li Magic Angle Turning Phase Adjusted Spinning Sideband (MATPASS) NMR spectrum. A positive electrode and a lithium secondary battery are also included

A method of preparing a positive electrode active material, and a rechargeable lithium battery including a positive electrode active material prepared therefrom are provided. The method includes adding lithium carbonate, nickel carbonate, and cobalt carbonate to an aqueous solvent and mixing the lithium carbonate, the nickel carbonate, the cobalt carbonate, and the aqueous solvent to prepare a raw material mixture, wet-pulverizing the raw material mixture, spray-drying the pulverized raw material mixture to obtain a positive electrode active material precursor mixture, and subjecting the positive electrode active material precursor mixture to heat treatment to obtain a positive electrode active material in a form of single particles and including lithium nickel-cobalt-based composite oxide.

A method of preparing a positive electrode active material, and a rechargeable lithium battery including a positive electrode active material prepared therefrom are provided. The method includes adding lithium carbonate, nickel carbonate, and cobalt carbonate to an aqueous solvent and mixing the lithium carbonate, the nickel carbonate, the cobalt carbonate, and the aqueous solvent to prepare a raw material mixture, wet-pulverizing the raw material mixture, spray-drying the pulverized raw material mixture to obtain a positive electrode active material precursor mixture, and subjecting the positive electrode active material precursor mixture to heat treatment to obtain a positive electrode active material in a form of single particles and including lithium nickel-cobalt-based composite oxide.

A positive electrode active material for lithium-ion rechargeable batteries comprises particles having Li, M, and oxygen. M comprises Ni in a content x, wherein x80 at %, relative to M; Co in a content y, wherein 0.01y20.0 at %, relative to M; Mn in a content z, wherein 0z20.0 at %, relative to M; Y in a content b, wherein 0.01b2.0 at %, relative to M; Zr in a content c, wherein 0.01c2.0 at %, relative to M; D in a content a, wherein 0 a5.0 at %, relative to M. D is selected from B, Ba, Ca, Cr, Fe, Mg, Mo, Nb, S, Si, Sr, Ti, V, W, and Zn. The material comprises secondary particles, wherein each of the secondary particles consists of at least two primary particles and at most twenty primary particles.

A positive electrode active material for lithium-ion rechargeable batteries comprises particles having Li, M, and oxygen. M comprises Ni in a content x, wherein x80 at %, relative to M; Co in a content y, wherein 0.01y20.0 at %, relative to M; Mn in a content z, wherein 0z20.0 at %, relative to M; Y in a content b, wherein 0.01b2.0 at %, relative to M; Zr in a content c, wherein 0.01c2.0 at %, relative to M; D in a content a, wherein 0 a5.0 at %, relative to M. D is selected from B, Ba, Ca, Cr, Fe, Mg, Mo, Nb, S, Si, Sr, Ti, V, W, and Zn. The material comprises secondary particles, wherein each of the secondary particles consists of at least two primary particles and at most twenty primary particles.

A positive electrode material includes a laminar lithium-containing metal oxide which includes other positive ions with a radius greater than a radius of lithium ions. The radius of the other positive ions in the positive electrode material is greater than the radius of the lithium ions, so that the other positive ions may play a supporting role in a laminar structure to enhance a misalignment energy barrier, alleviate the problem of aggravated misalignment of metal ions and lithium ions in a laminar negative electrode, and improve the stability of the laminar structure. Moreover, the other positive ions in the positive electrode material may also be embedded into a negative electrode material, where the other positive ions with the greater ionic radius play a supporting role in graphite, so as to reduce expansion/shrinkage of the graphite in the process that the ions with the less ionic radius are intercalated/deintercalated.

A positive electrode material includes a laminar lithium-containing metal oxide which includes other positive ions with a radius greater than a radius of lithium ions. The radius of the other positive ions in the positive electrode material is greater than the radius of the lithium ions, so that the other positive ions may play a supporting role in a laminar structure to enhance a misalignment energy barrier, alleviate the problem of aggravated misalignment of metal ions and lithium ions in a laminar negative electrode, and improve the stability of the laminar structure. Moreover, the other positive ions in the positive electrode material may also be embedded into a negative electrode material, where the other positive ions with the greater ionic radius play a supporting role in graphite, so as to reduce expansion/shrinkage of the graphite in the process that the ions with the less ionic radius are intercalated/deintercalated.

A positive electrode active material includes a lithium composite transition metal oxide in the form of a secondary particle including plural aggregated grains, and including an oriented structure in which a long axis of the grain is arranged in a direction from the secondary particle center toward the surface thereof in at least one portion of the secondary particle. A coating layer is formed on the surface of the secondary particle and includes a Co element. The lithium composite transition metal oxide contains nickel and cobalt. When the ratio of the molar number (mn) of cobalt to the mn of nickel in the grain is C1, the ratio of the mn of cobalt to the mn of nickel at a grain boundary is C2, and the ratio of the mn of cobalt to the mn of nickel in the coating layer is C3, C1<C2<C3 is satisfied.

A positive electrode active material includes a lithium composite transition metal oxide in the form of a secondary particle including plural aggregated grains, and including an oriented structure in which a long axis of the grain is arranged in a direction from the secondary particle center toward the surface thereof in at least one portion of the secondary particle. A coating layer is formed on the surface of the secondary particle and includes a Co element. The lithium composite transition metal oxide contains nickel and cobalt. When the ratio of the molar number (mn) of cobalt to the mn of nickel in the grain is C1, the ratio of the mn of cobalt to the mn of nickel at a grain boundary is C2, and the ratio of the mn of cobalt to the mn of nickel in the coating layer is C3, C1<C2<C3 is satisfied.

A positive electrode material, a preparation method thereof, a positive electrode plate, a secondary battery, and an electric apparatus. The positive electrode material includes positive electrode material particles. The positive electrode material particle includes a matrix and a modifying element, where the matrix includes LiNixCoyMnzO2, where x0.8, y0.12, and x+y+z=1. The modifying element includes a rare earth element and/or a refractory metal element.