Abstract: A method of preparing a lithium secondary battery includes: (1) mixing a small particle lithium composite transition metal oxide having an average particle diameter (D50) of less than 7 ?m with a boron-containing raw material and performing a heat treatment, mixing a large particle lithium composite transition metal oxide having an average particle diameter (D50) of 8 ?m or more with a cobalt-containing raw material and a boron-containing raw material and performing a heat treatment, mixing the first positive electrode active material and the second positive electrode active material to prepare a positive electrode material having a bimodal particle diameter distribution, preparing a positive electrode by coating the positive electrode material on a positive electrode collector, and assembling the positive electrode, a negative electrode including a silicon-based negative electrode active material, and a separator.

Abstract: A positive electrode active material includes: a lithium nickel-based oxide having a Ni content of about 60 mol % to 80 mol % among total metals excluding lithium; and a coating layer containing Ti and formed on a surface of the lithium nickel-based oxide. The lithium nickel-based oxide is of a single-particle-type including 50 or fewer nodules and has a thermal stability index (TSI) of about 42.5 or less as represented by Equation 1 according to the present disclosure. In Equation 1, the TSI is represented by “HFA×MPH/(T1?150),” and HFA, MPH, and Tl are values measured from a differential scanning calorimetry (DSC) analysis graph obtained by heating a lithium secondary battery fabricated using the positive electrode active material from 25° C. to 400° C. at a heating rate of 10° C./min.

Abstract: A positive electrode active material includes a lithium transition metal oxide, which is in the form of a secondary particle formed by aggregation of primary particles and is represented by Formula 1, wherein the lithium transition metal oxide has a crystalline size of 160 nm or less and an average particle diameter of the primary particle of 0.6 ?m or more. A preparation method thereof is also provided.

Abstract: A positive electrode active material includes a lithium transition metal oxide including Ni in an amount of about 60 at % or more among the transition metals excluding lithium, and is in a form of a single particle made up of one nodule or in a form of a pseudo-single particle that is a complex of 30 or fewer nodules. A proportion of a (003) plane with respect to a total surface area of the positive electrode active material is 40% or less.

Abstract: A positive electrode material includes a positive electrode active material comprising-including a lithium nickel-based oxide having a mole fraction of nickel of 50 mol % to 90 mol % among metallic elements excluding lithium, and a coating layer including boron (B), which is formed on the surface of the lithium nickel-based oxide, wherein the positive electrode material has a BET specific surface area of 0.2 m2/g to 0.4 m2/g, and the boron (B) is included in an amount of 500 ppm to 1,000 ppm based on the total weight of the positive electrode material.

Abstract: 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): 0.25?I550/I700?0.4. In Expression (1), I700 and I550 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 7Li Magic Angle Turning Phase Adjusted Spinning Sideband (MATPASS) NMR spectrum.

Abstract: A lithium secondary battery includes: a positive electrode; a negative electrode; an electrolyte; and a separator. The positive electrode includes first and second positive electrode active materials having different average particle diameters (D50). The average particle diameter (D50) of the first positive electrode active material is larger than that of the second positive electrode active material. The first and second positive electrode active materials include single-particle type particles. The negative electrode includes a silicon-based negative electrode active material, and the lithium secondary battery has an IRF value of about 1 to 1.4, defined by Equation 1 IRF = R p R n , wherein Rn refers to an interfacial resistance of the negative electrode measured after 100 cycles of charge/discharge are performed, and Rp refers to an interfacial resistance of the positive electrode measured after 100 cycles of charge/discharge are performed.

Abstract: A positive electrode includes a positive electrode active material layer including a first positive electrode active material and a second positive electrode active material having different average particle diameters from each other. An average particle diameter D50 of the first positive electrode active material is larger than an average particle diameter D50 of the second positive electrode active material, the first positive electrode active material and the second positive electrode active material include single-crystalline particles, and an interface resistance of the positive electrode having an SOC of 50% measured in a coin half-cell manufactured using the positive electrode is about 6.5? to 8.5?, and an interface resistance of the positive electrode having an SOC of 10% measured in a coin half-cell manufactured using the positive electrode is about 15? to 19?.

Abstract: A positive electrode active material for a secondary battery which includes a: nickel-based lithium composite transition metal oxide including nickel (Ni), wherein the lithium composite transition metal oxide satisfies Equation 2: [Equation 2] ? size (| crystallite sizeIB-crystallite sizeFWHM|) ?20, wherein, in Equation 1 and Equation 2, crystallite sizeFWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite sizeIB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

Abstract: A positive electrode material for a lithium secondary battery includes: a first positive electrode active material and a second positive electrode active material. The first positive electrode active material includes a lithium transition metal oxide in which a molar ratio of nickel among transition metals is 70 mol % or more, the second positive electrode active material includes a lithium transition metal oxide in which a molar ratio of nickel among transition metals is 25 mol % or more less than the molar ratio of the nickel among the transition metals of the first positive electrode active material, an average particle diameter of primary particles constituting the second positive electrode active material is larger than an average particle diameter of primary particles constituting the first positive electrode active material, and D50 of the second positive electrode active material is smaller than D50 of the first positive electrode active material.

Abstract: A method of preparing a positive electrode active material includes preparing a lithium transition metal oxide containing nickel in an amount of 60 mol % or more based on a total number of moles of metals excluding lithium, impregnating the lithium transition metal oxide with 300 ppm to 1,000 ppm of moisture based on 100 parts by weight of the lithium transition metal oxide, and performing a heat treatment on the lithium transition metal oxide impregnated with the moisture, wherein a lithium by-product present on a surface of the lithium transition metal oxide and the moisture react to form a passivation layer on the surface of the lithium transition metal oxide. A positive electrode active material prepared by the above-described preparation method, and a positive electrode and a lithium secondary battery which include the positive electrode active material are also provided.

Abstract: A positive electrode active material for a secondary battery which includes a nickel-based lithium composite transition metal oxide including nickel (Ni), wherein the lithium composite transition metal oxide satisfies Equation 1 and Equation 2 below 80 nm?crystallite sizeFWHM?150 nm??[Equation 1] ? size(|crystallite sizeIB?crystallite sizeFWHM|)?20??[Equation 2] wherein, in Equation 1 and Equation 2, crystallite sizeFWHM is a crystallite size obtained by calculating from X-ray diffraction (XRD) data using a full width at half maximum (FWHM) method, and crystallite sizeIB is a crystallite size obtained by calculating from XRD data using an integral breadth (IB) method.

Abstract: A positive electrode active material for a secondary battery includes a lithium composite transition metal oxide comprising nickel (Ni), cobalt (Co), and manganese (Mn), and a coating layer formed on surfaces of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and the coating layer comprises a compound represented by Formula 1: LiaM1bOc ??[Formula 1] wherein, M1 includes aluminum (Al) and at least one selected from the group consisting of boron (B), silicon (Si), titanium (Ti), and phosphorus (P), and 1?a?4, 1?b?8, and 1?c?20.

Abstract: A method of manufacturing a lithium secondary battery includes (1) mixing a transition metal precursor and a lithium source material and then sintering the mixture to prepare a lithium composite transition metal oxide, (2) mixing the lithium composite transition metal oxide with a cobalt-containing raw material and heat-treating the mixture at 550° C. to 700° C. to form a cobalt coating layer on the oxide, (3) mixing the lithium composite transition metal oxide on which the cobalt coating layer is formed with a boron-containing raw material and heat-treating the mixture at 400° C. to 500° C. to prepare a positive electrode active material including a boron coating layer, (4) applying the positive electrode active material onto a positive electrode current collector to prepare a positive electrode, and (5) assembling the positive electrode, the negative electrode including a silicon-based negative electrode active material, and a separator, and injecting an electrolyte.

Abstract: The present invention provides a positive electrode active material for a secondary battery, which includes a lithium transition metal oxide including nickel (Ni) and cobalt (Co), and at least one selected from the group consisting of aluminum (Al), manganese (Mn), and a combination thereof. The lithium transition metal oxide is characterized in that the content of nickel (Ni) in the total transition metal elements is 80 mol % or more, and the cation mixing ratio of Ni cations in a lithium layer in the lithium transition metal oxide structure is 1.1% or less.

Abstract: In one arrangement, the present disclosure relates to a positive electrode active material including a nickel-cobalt-manganese-based lithium transition metal oxide which contains nickel in an amount of 60 mol % or more based on a total number of moles of metals excluding lithium, wherein the nickel-cobalt-manganese-based lithium transition metal oxide is doped with doping element M1 (where the doping element M1 is a metallic element including Al) and doping element M2 (where the doping element M2 is at least one metallic element selected from the group consisting of Mg, La, Ti, Zn, B, W, Ni, Co, Fe, Cr, V, Ru, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and Si), where the doping element M1 can be in an amount of 100 ppm to 10,000 ppm, and the doping element M1 and the doping element M2 are included in a weight ratio of 50:50 to 99:1.

Abstract: A positive electrode active material for a secondary battery includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), and a glassy coating layer formed on surfaces of particles of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and the glassy coating layer includes a glassy compound represented by Formula 1. LiaM1bOc??[Formula 1] wherein, M1 is at least one selected from the group consisting of boron (B), aluminum (Al), silicon (Si), titanium (Ti), and phosphorus (P), and 1?a?4, 1?b?8, and 1?c?20.

Abstract: A positive electrode and a lithium secondary including the same is disclosed herein. In some embodiments, the positive electrode includes a positive electrode current collector, a first positive electrode active material layer and a second positive electrode active material layer sequentially stacked on the positive electrode current collector, wherein the first positive electrode active material layer and the second positive electrode active material layer include a bimodal positive active material, the first positive electrode active material layer includes small-diameter particles in the form of single particles, and the second positive electrode active material layer includes small-diameter particles in the form of secondary particles. The positive electrode has improved capacity, efficiency, lifespan, output properties, and thermal stability.

Abstract: The present disclosure relates to a positive electrode active material for a secondary battery, the positive electrode active material being a lithium composite transition metal oxide particle including nickel (Ni) and cobalt (Co) and including at least one of manganese (Mn) and aluminum (Al), wherein the lithium composite transition metal oxide particle includes 60 mol % or greater of the nickel (Ni) in all metals excluding lithium, a doping element is doped on the lithium composite transition metal oxide particle, and the particle intensity of the lithium composite transition metal oxide particle is 210 MPa to 290 MPa.

Abstract: A method of producing a positive electrode material for a secondary battery includes preparing a lithium composite transition metal oxide containing nickel, cobalt, and manganese, forming a coating layer on a surface of the lithium composite transition metal oxide, and post-treating the lithium composite transition metal oxide having the coating layer formed thereon, wherein the post-treating is performed by exposing the lithium composite transition metal oxide having the coating layer formed thereon to moisture at a relative humidity of 10% to 50% at 25° C., and then heat treating the lithium composite transition metal oxide to remove residual moisture.