Abstract: A cathode active material for a lithium secondary battery comprises lithium-nickel composite metal oxide particles, each of which has a secondary particle structure in which primary particles are aggregated. The lithium-nickel composite metal oxide particles include a first element including at least one element selected from the group consisting of B, Al, Si, Ti, V, Mn, Fe, Co, Cu, Zn, Zr, Mo and W, and a second element having an ionic radius of 80 pm or more. The second element is different from nickel and the first element. The second element is present on an outer surface of the secondary particle, at grain boundaries between the primary particles and at an inside of the primary particles.

Abstract: A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

Abstract: A cathode active material for a lithium secondary battery includes a first active material particle having a secondary particle structure that include first primary particles that are agglomerated or aggregated, and a second active material particle having a secondary particle structure that includes second primary particles that are agglomerated or aggregated. A particle diameter of the second active material particle is smaller than a particle diameter of the first active material particle, and an aspect ratio of the second primary particles is smaller than an aspect ratio of the first primary particles. Each of the first active material particle and the second active material particle includes a lithium-nickel-cobalt-based metal oxide, and a mass ratio of cobalt to active metals excluding lithium, nickel and cobalt in the lithium-nickel-cobalt-based metal oxide is in a range from 0.7 to 2.0.

Abstract: A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Abstract: In a method of manufacturing a cathode active material for a lithium secondary battery, a preliminary lithium metal oxide particle is prepared. The preliminary lithium metal oxide particle is cleaned using a boron compound cleaning solution. A cathode active material for a lithium secondary particle includes a lithium metal oxide particle where a ratio of a B+ peak intensity relative to a sum of peak intensities of Li+, B+ and LiB+ fragments by a TOF-SIMS analysis is in a range from 0.03% to 1.5%.

Abstract: In a method of manufacturing a cathode active material for a lithium secondary battery, a preliminary lithium metal oxide particle is prepared. The preliminary lithium metal oxide particle is cleaned using a boron compound cleaning solution. A cathode active material for a lithium secondary particle includes a lithium metal oxide particle where a ratio of a B+ peak intensity relative to a sum of peak intensities of Li+, B+ and LiB+ fragments by a TOF-SIMS analysis is in a range from 0.03% to 1.5%.

Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Abstract: In accordance with an embodiment of the present disclosure, there are provided a secondary battery and a battery module including the secondary battery as a unit battery, the secondary battery including an electrode assembly including a first electrode group including a first cathode; and a second electrode group including a second cathode, wherein the first cathode includes a first cathode active material, and the second cathode includes a first cathode active material and a second cathode active material, and wherein the first cathode active material is a lithium-nickel composite oxide having primary particles whose particle diameter is less than or equal to 1 ?m, and the second cathode active material is a lithium-nickel composite oxide having primary particles whose particle diameter is greater than 1 ?m.

Abstract: A cathode active material for a lithium secondary battery according to an embodiment of the present invention includes a lithium-nickel composite metal oxide in which an oxidation number of nickel is 2.8 or more. The lithium-nickel composite metal oxide includes a first doping element having an oxidation number of +2 and a second doping element having an oxidation number of +4. A ratio of a molar ratio of the second doping element relative to a molar ratio of the first doping element is greater than 1 and less than 5.

Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Abstract: A cathode active material for lithium secondary batteries according to embodiments of the present invention includes different types of lithium metal oxide particles having different circularities in a predetermined mixing weight ratio. When using the cathode active material for a lithium secondary battery, it is possible to provide a secondary battery having enhanced mechanical and electrical stability, and improved energy density.

Abstract: A cathode active material precursor for a lithium secondary battery has a structure of a nickel composite hydroxide. An oxygen position in a Z-axis direction measured by a Rietveld method in a space group P-3m crystal structure based on an X-ray diffraction (XRD) analysis is 0.200 or more. A cathode active material and a lithium secondary battery having a stabilized crystal structure are provided using the cathode active material precursor.

Abstract: A cathode active material precursor for a lithium secondary battery has a structure of a nickel composite hydroxide. A first peak intensity ratio represented by Equation 1 is 0.5 or more, and a second peak intensity ratio represented by Equation 2 is 0.7 or more. A cathode active material and a lithium secondary battery having a stabilized crystal structure are provided using the cathode active material precursor.

Abstract: A cathode active material for a lithium secondary battery according to an embodiment of the present invention has a structure of a lithium-nickel-based composite oxide. A crystallite size ratio obtained by an XRD analysis is in a range from 1.5 to 3.5, and D(003) exceeds 200 nm. The crystallite size is adjusted to promote movement of lithium ions in the cathode active material so that an initial efficiency of a lithium secondary battery is improved.

Abstract: A cathode active material for a lithium secondary battery comprises a lithium metal oxide that has a layered crystal structure and contains nickel and aluminum. The lithium metal oxide contains 70 mol % or more of nickel based on a total number of moles of all elements excluding lithium and oxygen. A ratio of lithium sites occupied by nickel instead of lithium among all lithium sites in the lithium metal oxide is in a range from 1% to 3.5%. A weight ratio of aluminum to nickel in the lithium metal oxide is in a range from 1/550 to 1/100.

Abstract: A cathode active material for a lithium secondary battery comprises lithium-nickel composite metal oxide particles, each of which has a secondary particle structure in which primary particles are aggregated. The lithium-nickel composite metal oxide particles include a first element including at least one element selected from the group consisting of B, Al, Si, Ti, V, Mn, Fe, Co, Cu, Zn, Zr, Mo and W, and a second element having an ionic radius of 80 pm or more. The second element is different from nickel and the first element. The second element is present on an outer surface of the secondary particle, at grain boundaries between the primary particles and at an inside of the primary particles.

Abstract: A cathode active material for a lithium secondary battery according to embodiments of the present invention has a high-nickel composition and includes a lithium-nickel composite metal oxide particle in which lithium, nickel and a metal having an oxidation number of +2 are combined in a predetermined range. A cation disorder caused when a nickel ion is present at a lithium-ion site is reduced to improve structural stability of the cathode active material. An initial capacity and a battery efficiency of a lithium secondary battery can be improved using the cathode active material.

Abstract: A cathode active material for a lithium secondary battery according to embodiments of the present invention has a high-nickel composition and includes a lithium-nickel composite metal oxide particle in which lithium, nickel and a metal having an oxidation number of +2 are combined in a predetermined range. A cation disorder caused when a nickel ion is present at a lithium-ion site is reduced to improve structural stability of the cathode active material. An initial capacity and a battery efficiency of a lithium secondary battery can be improved using the cathode active material.