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), wherein the lithium composite transition metal oxide has a layered crystal structure of space group R3m, includes the nickel (Ni) in an amount of 60 mol % or less based on a total amount of transition metals, includes the cobalt (Co) in an amount greater than an amount of the manganese (Mn), and is composed of single particles.

Abstract: A manufacturing apparatus of a precursor for positive electrode active material includes a reactor configured to receive a reaction solution and produce a precursor for positive electrode active material through a co-precipitation reaction of the reaction solution, a filtration unit disposed inside the reactor and configured to discharge a filtrate excluding solids in the reaction solution to the outside of the reactor when the reaction solution reaches a predetermined solution level, an extraction unit configured to extract a portion of the reaction solution when the size of a precursor particle in the reaction solution reaches a predetermined size, and a storage tank configured to receive a reaction solution extracted from the reactor through the extraction unit. A method of manufacturing and the precursor are also provided.

Abstract: A positive electrode active material is provided, including a lithium transition metal oxide containing nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium transition metal oxide has 60 mol % or more nickel (Ni) with respect the total number of moles of transition metal except lithium, and is doped with at least any one doping element selected from the group consisting of B, Zr, Mg, Ti, Sr, W, and Al. The positive electrode active material has an average particle diameter (D50) of 4 ?m to 10 ?m after rolling at a rolling density of 3.0 g/cm3 to 3.3 g/cm3 and has the form of a single particle. A method of preparing the positive electrode active material, a positive electrode including the positive electrode active material, and a lithium secondary battery are also provided.

Abstract: A positive electrode active material for a secondary battery which includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium composite transition metal oxide has a layered crystal structure of space group R3m, includes the nickel (Ni) in an amount of 60 mol % or less based on a total amount of transition metals, includes the cobalt (Co) in an amount greater than an amount of the manganese (Mn), and is composed of single particles.

Abstract: A method for analyzing an object includes measuring a first reflectivity of light from a surface and measuring a second reflectivity of light from the object, after the object is formed on the surface. A variation between the first and second reflectivities is calculated, and the variation is transformed by a predetermined transform. A thickness of the object is determined based on the transformed variation.

Abstract: A method for analyzing an object includes measuring a first reflectivity of light from a surface and measuring a second reflectivity of light from the object, after the object is formed on the surface. A variation between the first and second reflectivities is calculated, and the variation is transformed by a predetermined transform. A thickness of the object is determined based on the transformed variation.