Abstract: Provided is a lithium nickel complex oxide represented by Chemical Formula 1: LiwNiIIx1NiIIIx2MnyCozFdO2-d??<Chemical Formula 1> where x1+x2+y+z=1, 0.4?x1+x2?0.9, 0<y?0.6 and 0<z?0.6, 0.9?w?1.3, and 0<d?0.3.

Abstract: The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material being a secondary particle that includes a primary particle having a rectangular parallelepiped shape, the rectangular parallelepiped having at least one portion of vertices and edges formed in a round shape that is convex outward, wherein 1% to 40% of a total surface area of the secondary particle has open porosity, and the primary particle includes a lithium composite metal oxide of Formula 1 herein so that intercalation and deintercalation of lithium are facilitated, elution of an active material-constituting metal element is suppressed, and excellent structural stability is exhibited, thereby decreasing resistance and improving output and lifespan characteristics when applied to a battery, and a secondary battery comprising the same.

Abstract: Provided is a cathode active material including a complex coating layer, which includes M below, formed on a surface of the cathode active material through reaction of a lithium transition metal oxide represented by Formula 1 below with a coating precursor: LixMO2??(1) wherein M is represented by MnaM?1-b, M? is at least one selected from the group consisting of Al, Mg, Ni, Co, Cr, V, Fe, Cu, Zn, Ti and B, 0.95?x?1.5, and 0.5?a?1. The lithium secondary battery including the cathode active material exhibits improved lifespan and rate characteristics due to superior stability.

Abstract: The present invention provides a positive electrode active material for a secondary battery, a positive electrode for a secondary battery, and a secondary battery including the same, the positive electrode active material including a first lithium-nickel oxide particle having an average particle size (D50) of more than 8 ?m to 20 ?m or less, and a second lithium-nickel oxide particle having an average particle size (D50) of 8 ?m or less, wherein the first lithium-nickel oxide particle has a particle strength of 100 MPa to 250 MPa, the second lithium-nickel oxide particle has a particle strength of 50 MPa to 100 MPa, a ratio r of the strength of the first lithium-nickel oxide particle to the strength of the second lithium-nickel oxide particle satisfies Equation 1 set forth herein.

Abstract: Provided are a method of preparing a cathode active material including coating a surface of a lithium transition metal oxide with a lithium boron oxide by dry mixing the lithium transition metal oxide and a boron-containing compound and performing a heat treatment, and a cathode active material prepared thereby. A method of preparing a cathode active material according to an embodiment of the present invention may easily transform lithium impurities present in a lithium transition metal oxide into a structurally stable lithium boron oxide by performing a heat treatment near the melting point of a boron-containing compound. Also, a coating layer may be formed in which the lithium boron oxide is uniformly coated in an amount proportional to the used amount of the boron-containing compound even at a low heat treatment temperature.

Abstract: The present disclosure provides a method for testing a cycle life of a positive electrode active material for a secondary battery capable of predicting and assessing a cycle life of a positive electrode active material with high accuracy and excellent reliability in a short period of time using a simple method.

Abstract: The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material including a lithium composite metal oxide particle represented by Formula 1 below, and a secondary battery including the same. LiaNi1?x?yCoxM1yM2zM3wO2??[Formula 1] In Formula 1, M1 is a metal element whose surface energy (?Esurf) calculated by Equation 1 below is ?0.5 eV or higher, M2 is a metal element whose surface energy (?Esurf) calculated by Equation 1 below is ?1.5 eV or higher and less than ?0.5 eV, M3 is a metal element whose surface energy (?Esurf) calculated by Equation 1 below is less than ?1.5 eV, and 1.0?a?1.5, 0<x?0.5, 0<z?0.05, 0.002?w?0.1, 0<x+y?0.7.

Abstract: The present invention relates to a positive electrode active material for a secondary battery, which comprises a core including a lithium composite metal oxide, and a surface treatment layer located on a surface of the core and including an amorphous oxide, wherein the amorphous oxide including silicon (Si), nitrogen (N) and at least one metal element selected from the group consisting of a Group 1A element, a Group 2A element, and a Group 3B element, and a method for preparing the same.

Abstract: The present invention provides a positive electrode active material for a secondary battery and a secondary battery including the same, which includes a core; a shell located to surround the core; and a buffer layer located between the core and the shell, and including a three-dimensional network structure connecting the core and the shell and a pore, in which the core, the shell, and the three-dimensional network structure in the buffer layer each independently include a lithium nickel-manganese-cobalt-based composite metal oxide, and the positive electrode active material has a BET specific surface area of 0.2 m2/g to 0.5 m2/g, a porosity of 30 vol % or less, and an average particle size (D50) of 8 ?m to 15 ?m.

Abstract: The present invention relates to a method for recovering a positive electrode active material from a lithium secondary battery including: 1) separating a positive electrode into a collector and a positive electrode part; 2) removing an organic substance by firing the separated positive electrode part; 3) washing the fired resultant and removing remaining fluorine (F); 4) adding a lithium-containing material into the washed resultant and firing to recover a lithium transition metal oxide.

Abstract: The present invention provides a lithium secondary battery, including a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and a separator provided between the positive electrode and the negative electrode, wherein the negative electrode active material may include a titanium-based composite, wherein, when the lithium secondary battery is charged to SOC 50 under C-rate conditions of 0.1 to 40 C, the titanium-based composite has a ratio of the peak area of a plane (400) and the peak area of a plane (111) of 0.76 or more in a measured X-ray diffraction spectrum (XRD). Therefore, the present invention may provide a lithium secondary battery having excellent output characteristics and a battery pack in which a BMS prediction algorithm is simplified.

Abstract: Provided is a cathode active material including a complex coating layer, which includes M below, formed on a surface of the cathode active material through reaction of a lithium transition metal oxide represented by Formula 1 below with a coating precursor: LixMO2??(1) wherein M is represented by MnaM?1-b, M? is at least one selected from the group consisting of Al, Mg, Ni, Co, Cr, V, Fe, Cu, Zn, Ti and B, 0.95?x?51.5, and 0.5?a?1. The lithium secondary battery including the cathode active material exhibits improved lifespan and rate characteristics due to superior stability.

Abstract: Provided are a positive electrode active material having a concentration gradient in which concentrations of nickel and manganese are gradually changed from a center of a particle to a surface thereof, and a peak appears at 235° C. or more when heat flow of the positive electrode active material is measured by differential scanning calorimetry, a method of preparing the positive electrode active material, and a lithium secondary battery including the positive electrode active material.

Abstract: Provided are a method of manufacturing a lithium nickel complex oxide including mixing a nickel-containing mixed transition metal precursor, a lithium compound, and a polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, and heat treating the mixture, a lithium nickel complex oxide manufactured thereby, and a cathode active material including the lithium nickel complex oxide. The method of manufacturing a lithium nickel complex oxide according to an embodiment of the present invention may adjust a ratio of divalent nickel (NiII) to trivalent nickel (NiIII) by using a polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, and thus, the method may improve capacity of a secondary battery.

Abstract: The present disclosure relates to a cathode active material for a lithium secondary battery with improved rate characteristics in which a spinel surface structure is formed by fluorine coating on a surface of layered lithium nickel-manganese-cobalt cathode active material and a method for manufacturing the same, and according to the present disclosure, there is provided a lithium secondary battery with improved rate characteristics that may be charged to a capacity close to a full charge in a short time when compared to a related art and thus is suitable for high capacity of a secondary battery.

Abstract: Disclosed are a transition metal precursor for preparing a lithium composite transition metal oxide, a method for preparing the precursor, and a lithium composite transition metal oxide. The transition metal precursor includes a composite transition metal compound having a composition represented by Formula (1) and a Mn content of 60 to 85 mol %: NiaMbMn1-(a+b)(OH1-x)2??(1) where M is at least one selected from the group consisting of Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zr, Zn and period II transition metals, 0.15?a?0.3, 0?b?0.1 and 0<x<0.5. The lithium composite transition metal oxide has a composition represented by Formula (2) and a Mn content of 60 to 85 mol %: Li1+z[NiaMbMn1-(a+b)]2O4-yAy??(2) where M is at least one selected from the group consisting of Ti, Co, Al, Cu, Fe, Mg, B, Cr and period II transition metals, A is a monoanion or dianion, 0.15?a?0.3, 0.005?b?0.1, ?0.1?z?0.1 and 0?y?0.1.

Abstract: A positive electrode active material particle includes a core that contains lithium cobalt oxide represented by the following Chemical Formula LiaCo(1-x)MxO2-yAy and a shell that is coated on the surface of the core and contains composite metal oxide of a metal with an oxidation number of +2 and a metal with an oxidation number of +3. In particular, M is at least one selected from the group consisting of Ti, Mg, Zn, Si, Al, Zr, V, Mn, Nb and Ni. A is oxygen-substitutional halogen and 1.00?a?1.05, 0?x?0.05, and 0?y?0.001.

Abstract: Provided are a cathode active material including lithium transition metal phosphate particles, wherein the lithium transition metal phosphate particles include a first secondary particle formed by agglomeration of two or more first primary particles, and a second secondary particle formed by agglomeration of two or more second primary particles in the first secondary particle, and a method of preparing the same. Since the cathode active material according to an embodiment of the present invention may include first primary particles and second primary particles having different average particle diameters, the exfoliation of the cathode active material from a cathode collector may be minimized and performance characteristics, such as high output characteristics and an increase in available capacity, of a secondary battery may be further improved. In addition, since the first secondary particles are porous, the secondary particles are collapsed and fractured due to rolling when used in a cathode.

Abstract: Provided is a positive electrode active material particle for a secondary battery, including a core part containing lithium cobalt oxide; and a shell part that is located on the surface of the core part and contains lithium-deficient cobalt oxide which is deficient in lithium because a molar ratio of lithium to cobalt is 0.9 or less.

Abstract: Disclosed are a cathode active material and a lithium secondary battery including the same, and a method of manufacturing the cathode active material, the method including: (a) manufacturing a lithium metal oxide according to formula 1 below: Li1+zNiaMnbCo1?(a+b)O2??(1) wherein 0?z?0.1, 0.1?a?0.8, 0.1?b?0.8 and a+b<1; (b) dry mixing the lithium metal oxide, and a precursor including zirconium and fluorine; and (c) changing the precursor including zirconium and fluorine into ZrO2 and substituting some of oxygen (O) anions with F by heat-treatment after dry mixing of step (b), wherein the cathode active material is coated with ZrO2 and F.