An electrode active composition, comprising: a first component, the first component being lithium cobalt oxide particles; and a second component, the second component being ternary material particles; a chemical formula of the lithium cobalt oxide is Li x Co y M 1 (1-y) O 2, wherein 0.95≤x≤1.05, 0.8≤y≤1, and M 1 is selected from a combination of one or more of Zr, Mg, Ti, Sr, W, Nb, Al, P, F, and S; the ternary material is selected from lithium nickel manganese cobalt oxide or lithium nickel cobalt aluminum oxide; a chemical formula of the lithium nickel manganese cobalt oxide is Li a Ni b Co c Mn d M 2 (1-b-c-d) O 2, wherein 0.5≤a≤1.2, 0.65≤b≤1, 0≤c≤0.35, 0≤d≤0.35, and M 2 is selected from a combination of one or more of Zr, Zn, Ti, Sr, Sb, Y, W, Al, B, P, F, and S; and a chemical formula of the lithium nickel cobalt aluminum oxide is Li x Ni e Co f Al g M 3 (1-e-f-g) O 2, 0.5≤x≤1.2, 0. 5≤e≤1, 0≤f≤0.5, 0≤g≤0.5, and M 3 is selected from a combination of one or more of Zr, Mg, Ba, Ti, Sr, Sb, Y, W, and B; wherein the first component comprises lithium cobalt oxide particles with a particle size greater than 11 μm and lithium cobalt oxide particles with a particle size less than 6 μm, wherein the particle size is determined as described in the application, and a ratio in number of the lithium cobalt oxide particles with a particle size greater than 11 μm to the lithium cobalt oxide particles with a particle size less than 6 μm is 0.2-2.8; and a summed number of the lithium cobalt oxide particles with a particle size greater than 11 μm and the lithium cobalt oxide particles with a particle size less than 6 μm accounts for above 90% of a total number of particles in the first component. a first component, the first component being lithium cobalt oxide particles; and a second component, the second component being ternary material particles; a chemical formula of the lithium cobalt oxide is Li x Co y M 1 (1-y) O 2, wherein 0.95≤x≤1.05, 0.8≤y≤1, and M 1 is selected from a combination of one or more of Zr, Mg, Ti, Sr, W, Nb, Al, P, F, and S; the ternary material is selected from lithium nickel manganese cobalt oxide or lithium nickel cobalt aluminum oxide; a chemical formula of the lithium nickel manganese cobalt oxide is Li a Ni b Co c Mn d M 2 (1-b-c-d) O 2, wherein 0.5≤a≤1.2, 0.65≤b≤1, 0≤c≤0.35, 0≤d≤0.35, and M 2 is selected from a combination of one or more of Zr, Zn, Ti, Sr, Sb, Y, W, Al, B, P, F, and S; and a chemical formula of the lithium nickel cobalt aluminum oxide is Li x Ni e Co f Al g M 3 (1-e-f-g) O 2, 0.5≤x≤1.2, 0. 5≤e≤1, 0≤f≤0.5, 0≤g≤0.5, and M 3 is selected from a combination of one or more of Zr, Mg, Ba, Ti, Sr, Sb, Y, W, and B; wherein the first component comprises lithium cobalt oxide particles with a particle size greater than 11 μm and lithium cobalt oxide particles with a particle size less than 6 μm, wherein the particle size is determined as described in the application, and a ratio in number of the lithium cobalt oxide particles with a particle size greater than 11 μm to the lithium cobalt oxide particles with a particle size less than 6 μm is 0.2-2.8; and a summed number of the lithium cobalt oxide particles with a particle size greater than 11 μm and the lithium cobalt oxide particles with a particle size less than 6 μm accounts for above 90% of a total number of particles in the first component.