Electrode active composition, preparation method thereof, electrode, battery, and apparatus

A method of making an electrode active composition, the method comprising:

• providing a plurality of first particles of lithium cobalt oxide having a formula of LixCoyM1(1-y)O2, wherein x satisfies 0.95≤x≤1.05, y satisfies 0.8≤y≤1, and M1 is selected from the group consisting of Zr, Mg, Ti, Sr, W, Nb, Al, P, F, S, and any combination thereof;
• providing a plurality of second particles having a core-coating layer structure, wherein providing the plurality of second particles further comprises:
• providing a core comprising a ternary material selected from the group consisting of lithium nickel cobalt aluminum oxide, lithium nickel manganese cobalt oxide, or a combination thereof;
• providing a coating layer precursor comprising a sulfur-containing compound, wherein the sulfur-containing compound is selected from the group consisting of mercaptan, thiophenol, thioether, thioaldehyde, thioketone, thionocarboxylic acid, sulphoxide, sulfone, sulfur oxoacid, sulfamide, sulfamic acid, lithium bisfluorosulfonimide, thiopropionamide, thioisobutyramide, propylene sulfide, methyl ethyl sulfide, R1-S(═O)2—R2, R1-C(═S)—R2,
• R1-C—S—C—R2, or R1-S(═O)2—LiN—S(═O)2—R2, and any combination thereof, wherein R1 and R2 are each independently selected from hydroxyl, amino, Ci-6 alkyl, aryl, a halogen atom selected from the group consisting of F, Cl, Br, and I, and a hydrogen atom;
• and
• treating the core with the coating layer precursor to form a reaction product as the coating layer on at least a part of a surface of the core, wherein the reaction product comprises Li, S, and O, and S in the coating layer accounts for 400 ppm-5000 ppm in the second particles by weight;
• and
• mixing the plurality of first particles and the plurality of second particles;
• wherein the plurality of first particles comprise first lithium cobalt oxide particles with a particle size greater than 11 μm and second lithium cobalt oxide particles with a particle size less than 6 μm, 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 0.2-4.8;
• and
• a summed number of the first lithium cobalt oxide particles with a particle size greater than 11 μm and the second lithium cobalt oxide particles with a particle size less than 6 μm accounts for above 90% of a total number of particles in the plurality of first particles.