A cathode material, a cathode slurry and a lithium ion battery provided. The cathode material has a general chemical formula of Li.sub.Ni.sub.aCo.sub.bMn.sub.cM1.sub.xM2.sub.yM3.sub.zO.sub.2+r, where 0.801.20, a+b+c+x+y+z=1, 0.6a1.0, 0.0b0.10, 0.0c0.3, 0<x<0.3, 0<y<0.3, 0<z<0.3, 0.2<r<0.3, M1, M2, and M3 each independently include at least one of Al, Co, Zr, B, Ti, Ca, Ce, Zn, Cr, Mg, Y, La, Sr, Ba, W, Mo, Nb, Si and Sb, and M1, M2, and M3 are not identical to each other; the cathode material has an initial Coulombic efficiency denoted as E, an oil absorption value denoted as P mL/100 g, and a span of volume particle size distribution denoted as S, where S=(D90D10)/D50. The cathode material satisfies the following relational expression: 1.0E*(P20)+S8. In the technical solution provided, while improving the processability of the cathode material, the cathode material also achieves both high energy density and rate performance.

A cathode material, a cathode slurry and a lithium ion battery provided. The cathode material has a general chemical formula of Li.sub.Ni.sub.aCo.sub.bMn.sub.cM1.sub.xM2.sub.yM3.sub.zO.sub.2+r, where 0.801.20, a+b+c+x+y+z=1, 0.6a1.0, 0.0b0.10, 0.0c0.3, 0<x<0.3, 0<y<0.3, 0<z<0.3, 0.2<r<0.3, M1, M2, and M3 each independently include at least one of Al, Co, Zr, B, Ti, Ca, Ce, Zn, Cr, Mg, Y, La, Sr, Ba, W, Mo, Nb, Si and Sb, and M1, M2, and M3 are not identical to each other; the cathode material has an initial Coulombic efficiency denoted as E, an oil absorption value denoted as P mL/100 g, and a span of volume particle size distribution denoted as S, where S=(D90D10)/D50. The cathode material satisfies the following relational expression: 1.0E*(P20)+S8. In the technical solution provided, while improving the processability of the cathode material, the cathode material also achieves both high energy density and rate performance.

An electrode active material is produced by performing a heat treatment after adding a plurality of metal salts each including metal components that are Li, Ni, Co, and Mn or Al to a black mass obtained by processing used lithium-ion batteries, so that the black mass and the metal salts are reacted with each other. A positive active material of a lithium-ion battery is an electrode active material produced by directly using the black mass. Thus, it is possible to achieve an electrode active material, and a lithium-ion battery, which have high practicality and are capable of ensuring desired battery properties without requiring much time and effort such as recovery of metal salts from the black mass and purification of the metal salts.

An electrode active material is produced by performing a heat treatment after adding a plurality of metal salts each including metal components that are Li, Ni, Co, and Mn or Al to a black mass obtained by processing used lithium-ion batteries, so that the black mass and the metal salts are reacted with each other. A positive active material of a lithium-ion battery is an electrode active material produced by directly using the black mass. Thus, it is possible to achieve an electrode active material, and a lithium-ion battery, which have high practicality and are capable of ensuring desired battery properties without requiring much time and effort such as recovery of metal salts from the black mass and purification of the metal salts.

A positive electrode material and a preparation method thereof, a positive electrode slurry, a positive electrode plate, a lithium ion battery and a preparation method thereof are provided. The battery comprises an electrolyte, the electrolyte comprises lithium hexafluorophosphate and an organic solvent, the positive electrode material comprises a positive electrode active substance and lithium carbonate, the lithium carbonate is coated on the surface of the positive electrode active substance, and a mass ratio of the positive electrode active substance to the lithium carbonate is 1:(0.001-0.03).

A positive electrode material and a preparation method thereof, a positive electrode slurry, a positive electrode plate, a lithium ion battery and a preparation method thereof are provided. The battery comprises an electrolyte, the electrolyte comprises lithium hexafluorophosphate and an organic solvent, the positive electrode material comprises a positive electrode active substance and lithium carbonate, the lithium carbonate is coated on the surface of the positive electrode active substance, and a mass ratio of the positive electrode active substance to the lithium carbonate is 1:(0.001-0.03).

A cathode active material for secondary battery according to the present disclosure includes lithium metal oxide particles. The lithium metal oxide particles include nickel, include or do not include cobalt, and have a single particle structure. Based on a total number of moles of elements excluding lithium and oxygen in the lithium metal oxide particles, a content of nickel is 70 mol % to 85 mol %, and a content of cobalt is 0.1 times or less than the content of nickel. A (104) plane grain size of the lithium metal oxide particles calculated through X-ray diffraction (XRD) analysis is 400 nm to 700 nm.

A cathode active material for secondary battery according to the present disclosure includes lithium metal oxide particles. The lithium metal oxide particles include nickel, include or do not include cobalt, and have a single particle structure. Based on a total number of moles of elements excluding lithium and oxygen in the lithium metal oxide particles, a content of nickel is 70 mol % to 85 mol %, and a content of cobalt is 0.1 times or less than the content of nickel. A (104) plane grain size of the lithium metal oxide particles calculated through X-ray diffraction (XRD) analysis is 400 nm to 700 nm.

A metal oxide precursor particle according to the present disclosure has a hollow structure, includes nickel, cobalt and manganese, and has a median particle diameter of 20 to 40 m. According to a method for preparing metal oxide precursor particles according to the present disclosure, a mixed solution containing water and a metal source including a nickel source, a cobalt source and a manganese source is prepared. The mixed solution is sprayed into a quartz tube. The quartz tube includes a particle formation region therein, and the temperature of the particle formation region is set to 750 to 1100 C. According to a method for preparing a cathode active material of the present disclosure, the metal oxide precursor particles are pulverized to prepare small-sized metal oxide precursor particles. A mixture including the small-sized metal oxide precursor particles and a lithium source is calcined to prepare lithium metal oxide particles.

A metal oxide precursor particle according to the present disclosure has a hollow structure, includes nickel, cobalt and manganese, and has a median particle diameter of 20 to 40 m. According to a method for preparing metal oxide precursor particles according to the present disclosure, a mixed solution containing water and a metal source including a nickel source, a cobalt source and a manganese source is prepared. The mixed solution is sprayed into a quartz tube. The quartz tube includes a particle formation region therein, and the temperature of the particle formation region is set to 750 to 1100 C. According to a method for preparing a cathode active material of the present disclosure, the metal oxide precursor particles are pulverized to prepare small-sized metal oxide precursor particles. A mixture including the small-sized metal oxide precursor particles and a lithium source is calcined to prepare lithium metal oxide particles.