Abstract: A positive active material comprising active material bulk particles and a coating layer of an oxide containing N element is disclosed, wherein the surface of the active material bulk particle is doped with M element to form a doped layer, and the content of the M element is 400 ppm to 3000 ppm, and the content of the M element gradually decreases from the outer surface of active material bulk particles towards the core direction; wherein the content of the N element in the coating layer is 100 ppm to 2000 ppm; wherein the average content of the N element per unit volume of the coating layer is greater than the average content of the M element per unit volume of the doped layer; wherein the M element and the N element are each independently selected from one or more of Mg, Ca, Ce, Ti, Zr, Al, Zn, and B.

Abstract: This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li1+a[NixCoyMnzMbM?c]O2?dYd, where distribution of each of the doping elements M, M?, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.

Abstract: This application relates to a positive electrode active material and a preparation method thereof, a lithium-ion secondary battery and related battery module, battery pack, and apparatus. The positive electrode active material of this application includes a composite oxide of lithium, boron, and a transition metal element, where the transition metal element includes element nickel, and a molar ratio of element nickel to element lithium ranges from 0.55 to 0.95; the positive electrode active material includes secondary particles formed by primary particles; at least 50% of the primary particles in the secondary particle are arranged radially; in the outermost layer of the secondary particle, 70% or more of the primary particles each have at least two parallel sides; and in a cross section through the center of the secondary particle, 60% or more of the primary particles each have at least two parallel sides.

Abstract: The present disclosure relates to a ternary positive electrode material and a battery using the ternary positive electrode material. The ternary positive electrode material includes secondary particles composed of primary particles. The secondary particles have an average particle diameter D50 of 6 ?m-20 ?m, BET of 0.2 m2/g-1 m2/g, and the number ? of primary particles per unit area of the secondary particles is 5 particles/?m2-100 particles/?m2. The ternary positive electrode material has a formula of Li1+a[NixCoyMnzM1bM2c]O2?dNd, where element M1 and element M2 are each independently selected from at least one of Al, Zr, Ti, Mg, Zn, B, Ca, Ce, Te and Fe, element N is selected from at least one of F, Cl and S, and 0<x<1, 0<y?0.3, 0?z?0.3, ?0.1<a<0.2, 0?b<0.3, 0?c<0.3, 0?d<0.2, 0?b+c?0.3, x+y+z+b=1. The formed secondary particles have high compactness, thereby effectively improving the structural stability and the cycling performance at high or low temperature.

Abstract: This application provides a positive active material and a preparation method thereof, an electrochemical battery, a battery module, a battery pack, and an apparatus. The positive active material includes an inner core and a coating layer, where the coating layer coats a surface of the inner core. The inner core is selected from a ternary material with a molecular formula of Li1+a[NixCoyMnzMbM?c]O2?dYd, where distribution of each of the doping elements M, M?, and Y in the inner core meets the following condition: there is a reduced mass concentration gradient from an outer side of the inner core to a center of the inner core. The positive active material herein features high gram capacity, high structural stability, and high thermal stability, so that the electrochemical battery has excellent cycle performance and storage performance and high initial discharge gram capacity.

Abstract: A positive active material comprising active material bulk particles and a coating layer of an oxide containing N element is disclosed, wherein the surface of the active material bulk particle is doped with M element to form a doped layer, and the content of the M element is 400 ppm to 3000 ppm, and the content of the M element gradually decreases from the outer surface of active material bulk particles towards the core direction; wherein the content of the N element in the coating layer is 100 ppm to 2000 ppm; wherein the average content of the N element per unit volume of the coating layer is greater than the average content of the M element per unit volume of the doped layer; wherein the M element and the N element are each independently selected from one or more of Mg, Ca, Ce, Ti, Zr, Al, Zn, and B.

Abstract: The present disclosure relates to a ternary positive electrode material and a battery using the ternary positive electrode material. The ternary positive electrode material includes secondary particles composed of primary particles. The secondary particles have an average particle diameter D50 of 6 ?m-20 ?m, BET of 0.2 m2/g-1 m2/g, and the number ? of primary particles per unit area of the secondary particles is 5 particles/?m2-100 particles/?m2. The ternary positive electrode material has a formula of Li1+a[NixCoyMnzM1bM2c]O2-dNd, where element M1 and element M2 are each independently selected from at least one of Al, Zr, Ti, Mg, Zn, B, Ca, Ce, Te and Fe, element N is selected from at least one of F, Cl and S, and 0<x<1, 0<y?0.3, 0?z?0.3, ?0.1<a<0.2, 0?b<0.3, 0?c<0.3, 0?d<0.2, 0?b+c?0.3, x+y+z+b=1. The formed secondary particles have high compactness, thereby effectively improving the structural stability and the cycling performance at high or low temperature.