A high-nickel positive electrode single crystal precursor, a high-nickel single crystal positive electrode material and a preparation method thereof, and a secondary battery

Abstract

The present invention belongs to the technical field of battery active materials, and specifically discloses a high-nickel positive electrode single crystal precursor, a high-nickel single crystal positive electrode material and a preparation method thereof, and a secondary battery. The chemical formula of the precursor is (Ni x Co y Mn z A a )(OH)2, wherein x≥0.9, y>0, 0<z≤0.1, x+y+z=1, 0≤a≤0.003, A is a doping element; tap density is 1.9 g / cm 3 ~2.2g / cm 3 , with a specific surface area of ​​28.0m 2 / g~35.0m 2 / g. The positive electrode material is prepared by sintering the precursor. The present invention provides a high nickel positive electrode single crystal precursor with good primary particle sphericity, high specific surface area and high tap density. The sintering temperature can be reduced when preparing the positive electrode material based on the precursor, and a high nickel single crystal positive electrode material with a smaller primary particle size can be obtained, which is beneficial to the performance of the positive electrode capacity.

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