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 material and a method of producing thereof is provided. The positive electrode material having a bimodal particle diameter distribution and including large-diameter particles and small-diameter particles, wherein the small-diameter particle is a lithium composite transition metal oxide in the form of a single particle and containing a rock salt phase formed on a surface portion thereof.

Abstract: A positive electrode active material includes a nickel-based 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, wherein cobalt is included in an amount of greater than 0 ppm to 6,000 ppm or less on a surface of the nickel-based lithium transition metal oxide. A method of preparing the positive electrode active material, a positive electrode for a lithium secondary battery and a lithium secondary battery which includes the positive electrode active material are also provided.

Abstract: A positive electrode material and a positive electrode and a lithium secondary battery including the same are provided. The positive electrode material having a bimodal particle size distribution which includes large-diameter particles and small-diameter particles having different average particle diameters (D50), wherein the large-diameter particles are lithium composite transition metal oxide having a nickel content of 80 atm % or more in all transition metals thereof, and the small-diameter particles are a lithium composite transition metal oxide including nickel, cobalt, and aluminum, having a nickel content of 80 atm % to 85 atm % in all transition metals, and having an atomic ratio of the cobalt to the aluminum (Co/Al) of 1.5 to 5.

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 at least one particle growth-promoting element selected from the group consisting of strontium (Sr), zirconium (Zr), magnesium (Mg), yttrium (Y), and aluminum (Al). The lithium composite transition metal oxide includes the nickel (Ni) in an amount of 65 mol % or more and the manganese (Mn) in an amount of 5 mol % or more based on a total amount of transition metals, and the positive active material has a single particle.

Abstract: The present disclosure provides a method for manufacturing a positive electrode for a secondary battery, the method including forming a positive electrode mixture layer including a positive electrode active material on a positive electrode current collector, and forming a metal oxide coating layer on the positive electrode mixture layer by atomic layer deposition, wherein the positive electrode active material includes lithium composite transition metal oxide particles and a boron-containing coating layer formed on the lithium composite transition metal oxide particles, and the lithium composite transition metal oxide particles include nickel (Ni), cobalt (Co), and manganese (Mn), wherein the nickel (Ni) is 60 mol % or greater of all metals excluding lithium.

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.

Abstract: A method for producing a high-nickel positive electrode active material, a positive electrode active material produced thereby, and a positive electrode and a lithium secondary battery including the same is provided. The method includes preparing a lithium composite transition metal oxide having a nickel content of 80 atm % or greater among transition metals, washing the lithium composite transition metal oxide, and mixing the washed lithium composite transition metal oxide with an aluminum raw material and heat treating the mixture at a temperature of 650° C. to 690° C. to obtain a positive electrode active material having a surface portion doped with aluminum.

Abstract: Provided are a positive electrode active material comprising at least one secondary particle comprising an agglomerate of primary macro particles, a method for preparing the same and a lithium secondary battery comprising the same. Further provided is a positive electrode active material comprising secondary particles with improved resistance by simultaneously growing the average particle size (D50) and the crystal size of the primary macro particles. Thus, it is possible to provide a nickel-based positive electrode active material with high press strength, long life and good gas performance.

Abstract: A positive electrode material including a first positive electrode active material represented by Formula 1 and a second positive electrode active material represented by Formula 2, a positive electrode including the same, and a lithium secondary battery including the positive electrode are provided. The positive electrode material has a bimodal particle size distribution including large diameter particles and small diameter particles, and the difference in average particle diameter (D50) between the large diameter particles and the small diameter particles is 3 ?m or greater.

Abstract: A positive electrode active material precursor is provided, which includes a transition metal hydroxide particle represented by Formula 1 and a cobalt oxide particle and a manganese oxide particle attached to the surface of the transition metal hydroxide particle. A preparation method thereof, a positive electrode active material prepared using the same, a positive electrode including the positive electrode active material, and a secondary battery including the positive electrode are also provided.

Abstract: A positive electrode material for a secondary battery, including a first positive electrode active material and a second positive electrode active material, wherein the first positive electrode active material and the second positive electrode active material consist of a lithium composite transition metal oxide including at least two or more transition metals selected from the group consisting of nickel (Ni), cobalt (Co) and manganese (Mn) are provided. The average particle size (D50) of the first positive electrode active material is two or more times larger than that of the second positive electrode active material, and the first positive electrode active material has a concentration gradient in which at least one of Ni, Co or Mn contained in the lithium composite transition metal oxide has a concentration difference of 1.5 mol % or more between the center and the surface of a particle of the lithium composite transition metal oxide.

Abstract: The present invention relates to a novel compound as an mTOR inhibitor and a use thereof and, more specifically, to a novel compound represented by formula 1 that exhibits mTOR inhibitory activity and a pharmaceutical composition comprising same as an active ingredient for preventing or treating brain diseases associated with an mTOR pathway.

Abstract: A method for producing a positive electrode active material, a positive electrode active material produced thereby, and a positive electrode and a lithium secondary battery including the same are provided. The method includes preparing a nickel-manganese-aluminum precursor having an atomic fraction of nickel of 90 atm % or greater in all transition metals, and mixing the nickel-manganese-aluminum precursor, a cobalt raw material, and a lithium raw material and heat treating the mixture.

Abstract: Disclosed are a transition metal precursor for preparation of a lithium transition metal oxide, in which a ratio of tap density of the precursor to average particle diameter D50 of the precursor satisfies the condition represented by Equation 1 below, and a lithium transition metal oxide prepared using the same.

Abstract: A positive electrode active material includes a center portion including a first lithium transition metal oxide with an average composition represented by Formula 1, Li1+a1(Nib1Coc1Mnd1Ale1M1f1)O2??[Formula 1] wherein, in Formula 1, ?0.1?a1?0.2, 0.8?b1<1.0, 0<c1?0.2, 0<d1?0.1, 0<e1?0.05, 0?f1?0.05, b1/c1?25, and b1/d1?20, and M1 includes at least one selected from the group consisting of Mg, Ti, Zr, Nb, and W, and a surface portion including a second lithium transition metal oxide with an average composition represented by Formula 2, Li1+a2(Nib2Coc2Mnd2Ale2M1f2)O2??[Formula 2] wherein, in Formula 2, ?0.1?a2?0.2, 0.6?b2?0.95, 0?c2?0.2, 0?d2?0.1, 0?e2?0.05, 0?f2?0.05, b2/c2?13, and b2/d2?3, and M1 includes at least one selected from the group consisting of Mg, Ti, Zr, Nb, and W.

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 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.

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 method of preparing a positive electrode active material for a secondary battery includes preparing a positive electrode active material precursor including nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and forming a lithium composite transition metal oxide by mixing the positive electrode active material precursor and a lithium source and performing calcination, wherein the positive electrode active material precursor includes nickel (Ni) in an amount of 60 mol % or more out of the entire metal element, and a molar ratio (Li/M) of lithium (Li) of the lithium source to the entire metal element (M) of the positive electrode active material precursor is greater than 1.1.