Abstract: Provided is a positive electrode active material including a plurality of crystallites A, wherein the plurality of crystallites A has a crystallite long-axis orientation degree DoA represented by Equation 1 below is 0.5 to 1, and a crystallite c-axis orientation degree represented by a cross product value of a c-axis rotation vector Rc of a crystal lattice of a crystallite obtained by electron backscatter diffraction (EBSD) analysis and a position unit vector P? of the crystallite is 0.5 to 1. A proportion of the plurality of crystallites A is 25% to 80% with respect to a total number of crystallites in a cross-section of a positive electrode active material. Further provided is a positive electrode and a lithium secondary battery including the positive electrode active material.

Abstract: A positive electrode active material, a method of preparing the same, and a positive electrode and lithium secondary battery including the same are disclosed herein. In some embodiments, a positive electrode active material includes a lithium transition metal oxide which contains 60 mol % or more of nickel based on a total number of moles of transition metals excluding lithium in the lithium transition metal oxide, wherein the oxide is in a form of a secondary particle which is an aggregate of primary particles, wherein the lithium transition metal oxide satisfies Equation 1: 1 ? x y ? 20 Wherein x is a minimum area of a rectangle including all pores having an area greater than 0.002 ?m2 among closed pores distributed in the secondary particle, and y is a total sum of areas of the pores having an area greater than 0.002 ?m2 among the closed pores distributed in the secondary particle.

Abstract: A positive electrode for a secondary battery includes a positive electrode active material layer, which includes a positive electrode active material including a lithium transition metal oxide which contains nickel, cobalt, and manganese and has an atomic ratio of nickel in total transition metals of 80 atm % or more, and a metal oxide including a metallic element having a binding potential with lithium of 0.5 V to 4 V. A secondary battery including the positive electrode is also provided.

Abstract: A positive electrode active material has crystalline C having a crystalline major-axis orientation degree DoA of 0.5 to 1 and a crystalline c-axis orientation degree of less than 0.5, wherein among total crystallines in a cross section of a positive electrode active material particle, a ratio of the crystalline C is in a range of 25% to 70%. A positive electrode and a lithium secondary battery which include the same are also provided.

Abstract: A positive electrode active material precursor includes: a first region formed in the center of a particle of the positive electrode active material precursor and having a composition represented by Chemical Formula 1 or 2; and a second region formed on the first region and having a composition represented by Chemical Formula 3 or 4. A method of preparing the positive electrode active material precursor is also provided.

Abstract: A method for producing a positive electrode active material includes washing a lithium transition metal oxide with a washing solution, and solid-phase mixing the washed lithium transition metal oxide and a metal phosphate compound having a melting point of 500° C. or lower, followed by performing heat treatment to form a coating layer on the surface of the lithium transition metal oxide.

Abstract: A method of preparing a positive electrode active material which includes forming a pre-sintered mixture by adding a reaction mixture including a lithium raw material and a nickel-manganese-cobalt precursor to a first crucible and performing a primary heat treatment at a temperature of 500° C. to 800° C., and, after discharging the pre-sintered mixture from the first crucible, adding the pre-sintered mixture to a second crucible and performing a secondary heat treatment at a temperature of 700° C. to 1,000° C. to form a lithium nickel manganese cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the primary heat treatment is 20% to 50% of a volume of the reaction mixture added to the first crucible.

Abstract: The present disclosure relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

Abstract: The present invention provides a method of preparing a positive electrode active material precursor for a lithium secondary battery, a method of preparing a positive electrode active material for a lithium secondary battery in which the positive electrode active material precursor prepared by using the above method is used, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.

Abstract: A method of washing a positive electrode active material includes (1) preparing a lithium composite transition metal oxide which contains Ni, Co and Mn, and has the Ni content of 60 mol % or more; (2) putting the lithium composite transition metal oxide into water; and (3) adding a weak acid to water to which the lithium composite transition metal oxide is added to adjust the pH to 7 to 10, wherein the acid is a weak acid.

Abstract: A positive electrode for a secondary battery includes a positive electrode active material layer, which includes a positive electrode active material including a lithium transition metal oxide which contains nickel, cobalt, and manganese and has an atomic ratio of nickel in total transition metals of 80 atm % or more, and a metal oxide including a metallic element having a binding potential with lithium of 0.5 V to 4 V. A secondary battery including the positive electrode is also provided.

Abstract: A method of preparing a positive electrode active material which includes forming a pre-sintered mixture by adding a reaction mixture including a lithium raw material and a nickel-manganese-cobalt precursor to a first crucible and performing a primary heat treatment at a temperature of 500° C. to 800° C., and, after discharging the pre-sintered mixture from the first crucible, adding the pre-sintered mixture to a second crucible and performing a secondary heat treatment at a temperature of 700° C. to 1,000° C. to form a lithium nickel manganese cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the primary heat treatment is 20% to 50% of a volume of the reaction mixture added to the first crucible.

Abstract: A method of preparing a positive electrode active material precursor for a lithium secondary battery by using a batch-type reactor, which includes the steps of 1) forming positive electrode active material precursor particles while continuously adding a transition metal-containing solution including a transition metal cation, an aqueous alkaline solution, and an ammonium ion-containing solution to a batch-type reactor, 2) sedimenting the positive electrode active material precursor particles formed; 3) discharging a supernatant formed after the sedimentation of the positive electrode active material precursor particles to an outside; 4) adjusting a pH to 10 to 12 by adding the ammonium ion-containing solution; and 5) growing the positive electrode active material precursor particles while continuously again adding the transition metal-containing solution to the batch-type reactor, and a method of preparing a positive electrode active material using the same.

Abstract: The present disclosure relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

Abstract: The present invention relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

Abstract: The present invention provides a method of preparing a positive electrode active material precursor for a lithium secondary battery, a method of preparing a positive electrode active material for a lithium secondary battery in which the positive electrode active material precursor prepared by using the above method is used, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.

Abstract: A method of preparing a positive electrode active material precursor for a lithium secondary battery by using a batch-type reactor, which includes the steps of 1) forming positive electrode active material precursor particles while continuously adding a transition metal-containing solution including a transition metal cation, an aqueous alkaline solution, and an ammonium ion-containing solution to a batch-type reactor, 2) sedimenting the positive electrode active material precursor particles formed; 3) discharging a supernatant formed after the sedimentation of the positive electrode active material precursor particles to an outside; 4) adjusting a pH to 10 to 12 by adding the ammonium ion-containing solution; and 5) growing the positive electrode active material precursor particles while continuously again adding the transition metal-containing solution to the batch-type reactor, and a method of preparing a positive electrode active material using the same.

Abstract: The present invention relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.

Abstract: Disclosed is a separator for an electrochemical device including a porous polymer film, and a porous coating layer including at least one type of particles of inorganic particles and organic particles and binder polymer, the porous coating layer formed on one surface or both surfaces of the porous polymer film, wherein the porous polymer film has a structure in which multiple fibrils arranged parallel to the surface of the film are stacked in layers, and a diameter of the fibril disposed at the side of one surface of the film where the porous coating layer is formed is smaller than a diameter of the fibril disposed at a central part in a thickness-wise direction of the film, and an electrochemical device comprising the same.