Abstract: Provided are a lithium-ion battery positive electrode plate, comprising a positive electrode film layer disposed on at least one surface of the positive electrode current collector, wherein the positive electrode film layer comprises a positive electrode active material mixture composed of the following materials: polycrystalline particles of a first positive electrode active material with a particle size of 11.0-20.0 ?m; polycrystalline particles of a second positive electrode active material with a particle size of 6.0-10.5 ?m; and monocrystalline particles of a third positive electrode active material with a particle size of 1.1-5.2 ?m; wherein the number of the polycrystalline particles of the first positive electrode active material is a, the number of the polycrystalline particles of the second positive electrode active material is b, the number of the monocrystalline particles of the third positive electrode active material is c, and (a+b):c is in the range of 5.7:4.3 to 7.7:2.3.

Abstract: Embodiments of this application provide a ternary precursor material, a preparation method thereof, and a positive electrode active substance. A ternary precursor material may be provided in this application and may include a core and a shell, wherein (1) the core may have a molecular formula of NixCoyMn1-x-y(OH)2±a, where 0.8?x<1.0, 0<y<0.2, and 0<a<0.2; and the shell may include a doping element; and (2) a deformation stacking fault probability fD of the ternary precursor material may be ?4%. With use of the positive electrode active substance prepared by sintering the precursor material, secondary batteries have relatively high gram capacity and cycling performance.