The present application provides a high-nickel ternary precursor material, with a molecular formula shown in formula (I): Ni.sub.aCo.sub.bMn.sub.c(OH).sub.2.Math.(BO.sub.2).sub.d (I); where 0.8a<1, 0<b0.15, 0<c0.05, a+b+c=1, and 0<d0.05; the high-nickel ternary precursor material has an inner core having a densely stacked structure and an outer shell having a dendritic radial loose structure, and both the inner core and the outer shell of the high-nickel ternary precursor are evenly doped with B element. The present application can ensure the uniformity of a doping element by adding the doping element during the preparation process of the precursor material. The above precursor material of the present application has good high-temperature stability and can be used to obtain a fully radial positive electrode material with excellent performance by controlling the high-temperature sintering.

The present application provides a high-nickel ternary precursor material, with a molecular formula shown in formula (I): Ni.sub.aCo.sub.bMn.sub.c(OH).sub.2.Math.(BO.sub.2).sub.d (I); where 0.8a<1, 0<b0.15, 0<c0.05, a+b+c=1, and 0<d0.05; the high-nickel ternary precursor material has an inner core having a densely stacked structure and an outer shell having a dendritic radial loose structure, and both the inner core and the outer shell of the high-nickel ternary precursor are evenly doped with B element. The present application can ensure the uniformity of a doping element by adding the doping element during the preparation process of the precursor material. The above precursor material of the present application has good high-temperature stability and can be used to obtain a fully radial positive electrode material with excellent performance by controlling the high-temperature sintering.

The present application provides a positive electrode active material comprising a matrix material and a coating layer on the surface of the matrix material, wherein the matrix material has a chemical formula of LiNi.sub.xCo.sub.yMn.sub.zM.sub.aM.sub.bO.sub.2, wherein M=at least one of Zr, Y, Al, Ti, W, Sr, Ta, Sb, Nb, Na, K, Ca or Ce, M=at least one of N, F, S or Cl, 0.80x1.0, 0y0.20, 0z0.02, 0a0.02, and b=1-x-y-z-a; and the coating layer is a boron-containing ternary alloy or a boron-containing ternary alloy oxide. The present application further provides a method for preparing the positive electrode active material, a positive electrode plate comprising the positive electrode active material, a secondary battery, a battery module, a battery pack and a power consuming device.

The present application provides a positive electrode active material comprising a matrix material and a coating layer on the surface of the matrix material, wherein the matrix material has a chemical formula of LiNi.sub.xCo.sub.yMn.sub.zM.sub.aM.sub.bO.sub.2, wherein M=at least one of Zr, Y, Al, Ti, W, Sr, Ta, Sb, Nb, Na, K, Ca or Ce, M=at least one of N, F, S or Cl, 0.80x1.0, 0y0.20, 0z0.02, 0a0.02, and b=1-x-y-z-a; and the coating layer is a boron-containing ternary alloy or a boron-containing ternary alloy oxide. The present application further provides a method for preparing the positive electrode active material, a positive electrode plate comprising the positive electrode active material, a secondary battery, a battery module, a battery pack and a power consuming device.

Provided are a positive electrode material, a preparation method thereof and a lithium-ion battery. The positive electrode material has a composition as represented by formula (I): Ni.sub.xCo.sub.yMn.sub.1-x-yD.sub.kLi.sub.zO.sub.2 (I); where value ranges of x, y, z and k in the positive electrode material are respectively as follows: 0.6<x<1,0<y<0.2, and x+y<1; 1z1.05, 0k0.05; D is a modifying element including at least one of S, P, F, B, Al, Ti, Mg, Cr, Zr, V, Nb, Y, W, Ta, Co, Ce and Zn. A three-electrode battery cell is prepared with the positive electrode material of the present disclosure, and a change rate of an electrochemical active surface area of the positive electrode material is less than 5% during charge and discharge cycles of the three-electrode battery cell.

Provided are a positive electrode material, a preparation method thereof and a lithium-ion battery. The positive electrode material has a composition as represented by formula (I): Ni.sub.xCo.sub.yMn.sub.1-x-yD.sub.kLi.sub.zO.sub.2 (I); where value ranges of x, y, z and k in the positive electrode material are respectively as follows: 0.6<x<1,0<y<0.2, and x+y<1; 1z1.05, 0k0.05; D is a modifying element including at least one of S, P, F, B, Al, Ti, Mg, Cr, Zr, V, Nb, Y, W, Ta, Co, Ce and Zn. A three-electrode battery cell is prepared with the positive electrode material of the present disclosure, and a change rate of an electrochemical active surface area of the positive electrode material is less than 5% during charge and discharge cycles of the three-electrode battery cell.

The present application relates to a positive electrode active material and a preparation method thereof, a positive electrode sheet and a secondary battery. The positive electrode active material has a composition chemical formula of Li.sub.xNa.sub.1-xA.sub.yB.sub.1-yO.sub.2-nD.sub.n, where A is selected from a combination of Ni and Mn, B is selected from at least one non-alkali metal positive-valent element other than Ni, Mn, Co, and S, D is selected from F and/or S, 0.8x0.92, 0.90y<1.0, 0<n0.2, and a peak position difference between the NiO bond and the MnO bond of the positive electrode active material in a Raman spectrum is greater than 80 cm.sup.1 and less than 110 cm.sup.1. The positive electrode active material has high specific capacity and high cycle stability at a high voltage window, and low cost, causing the prepared secondary battery to have high cost performance.

The present application relates to a positive electrode active material and a preparation method thereof, a positive electrode sheet and a secondary battery. The positive electrode active material has a composition chemical formula of Li.sub.xNa.sub.1-xA.sub.yB.sub.1-yO.sub.2-nD.sub.n, where A is selected from a combination of Ni and Mn, B is selected from at least one non-alkali metal positive-valent element other than Ni, Mn, Co, and S, D is selected from F and/or S, 0.8x0.92, 0.90y<1.0, 0<n0.2, and a peak position difference between the NiO bond and the MnO bond of the positive electrode active material in a Raman spectrum is greater than 80 cm.sup.1 and less than 110 cm.sup.1. The positive electrode active material has high specific capacity and high cycle stability at a high voltage window, and low cost, causing the prepared secondary battery to have high cost performance.

The present application provides a preparation method for a positive electrode material precursor having a large channel, and an application thereof. The method comprises: mixing a sodium hexanitrocobaltate aqueous solution, a nickel-manganese mixed salt solution, an oxalic acid solution, and aqueous ammonia for reaction; calcining a solid material; and soaking the calcined material in water to obtain a positive electrode material precursor having a large channel. According to the present application, nickel-cobalt-manganese and sodium-ammonium are co-precipitated and sintered, and then sodium-ammonium is removed; and since the radius of sodium ions is greater than the radius of lithium ions, a large ion channel is left in a nickel-cobalt-manganese precursor framework, thereby facilitating the deintercalation of the lithium ions of a chemically sintered positive electrode material, widening a lithium ion diffusion channel, and remarkably improving the rate capability and the cycle performance of the material.

The present application provides a preparation method for a positive electrode material precursor having a large channel, and an application thereof. The method comprises: mixing a sodium hexanitrocobaltate aqueous solution, a nickel-manganese mixed salt solution, an oxalic acid solution, and aqueous ammonia for reaction; calcining a solid material; and soaking the calcined material in water to obtain a positive electrode material precursor having a large channel. According to the present application, nickel-cobalt-manganese and sodium-ammonium are co-precipitated and sintered, and then sodium-ammonium is removed; and since the radius of sodium ions is greater than the radius of lithium ions, a large ion channel is left in a nickel-cobalt-manganese precursor framework, thereby facilitating the deintercalation of the lithium ions of a chemically sintered positive electrode material, widening a lithium ion diffusion channel, and remarkably improving the rate capability and the cycle performance of the material.