A single-crystal ternary cathode material has an apparent factor Z = ( 1 S ⁡ ( D 9 ⁢ 0 ) ) x × H 1 . 2 - 1 ⁢ 9 . 4 × 0 . 1 ⁢ 8 x , with 1.1≤Z≤3; x=D90/D10, 2≤x≤5; wherein S(D90) is a number-average circularity equal to a sum of circularities of all target particles divided by n, n is a total number of the target particles. An area and a perimeter corresponding to a two-dimensional projected image of an individual target particle are S1 and l1 respectively, a circle with the area S1 has a perimeter of l2 and a circularity=l2/l1; H = D 1 ⁢ 0 ′ D 1 ⁢ 0 × 1 ⁢ 0 ⁢ 0 ⁢ % , D10′ is a particle size of a material obtained by pressing the single-crystal ternary cathode material under a pressure of 200 MPa, D10 does not exceed 2.4 μm, and D10′ does not exceed 2.3 μm.