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

Patent metadata

Field	Value
Publication number	US-12002947-B2
Application number	US-202318109812-A
Country	US
Kind code	B2
Filing date	Feb 14, 2023
Priority date	Sep 10, 2020
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

This application relates to an electrode active composition, a preparation method thereof, an electrode, a battery, and an apparatus. The electrode active composition includes: a first component, the first component being lithium cobalt oxide particles; and a second component, the second component being ternary material particles. The first component includes 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, 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 in some embodiments, 0.2-2.8. 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.

First claim

What is claimed is:

1. An electrode active composition, comprising:
a plurality of first particles of lithium cobalt oxide having a formula of Li x Co y M 1 (1-y) O 2 , wherein x satisfies 0.95≤x≤1.05, y satisfies 0.8≤y≤1, and M 1 is selected from the group consisting of Zr, Mg, Ti, Sr, W, Nb, Al, P, F, S, and any combination thereof; and
a plurality of second particles, each one of the second particles having a core-coating layer structure, the core-coating layer structure comprising a core and a coating layer, wherein
the core of the second particles is a ternary material selected from the group consisting of lithium nickel cobalt aluminum oxide, lithium nickel manganese cobalt oxide, and a combination thereof; and
the coating layer is disposed on at least a partial surface of the core and comprises a reaction product of a sulfur-containing compound and a lithium-containing compound, the reaction product comprises Li, S, and O, S in the coating layer accounts for 400 ppm-5000 ppm in the second particles by weight, the reaction product further comprises an element selected from the group consisting of P, F, or a combination thereof, when the reaction product comprises P, P accounts for 500 ppm-3000 ppm in the second particles by weight, and when the reaction product comprises F, F accounts for 200 ppm-1500 ppm in the second particles by weight;

wherein the plurality of first particles comprise lithium cobalt oxide particles with a particle size greater than 11 μm and lithium cobalt oxide particles with a particle size less than 6 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 lithium cobalt oxide particles with a particle size greater than 11 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 particles.

2. The electrode active composition according to claim 1 , wherein a weight ratio of the first particles to the second particles is 1:1 to 9:1.

3. The electrode active composition according to claim 1 , wherein a particle size of the second particles is 2 μm-6 μm.

4. The electrode active composition according to claim 1 , wherein:
the second particles have at least a single crystal structure.

5. The electrode active composition according to claim 1 , wherein
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 the group consisting of Zr, Zn, Ti, Sr, Sb, Y, W, Al, B, P, F, S, and any combination thereof; 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 the group consisting of Zr, Mg, Ba, Ti, Sr, Sb, Y, W, B, or any combination thereof.

6. The electrode active composition according to claim 1 , wherein a compacted density of the electrode active composition is ≥4.05 g/cm 3 , and the compacted density is a density of a briquette formed by pressing the electrode active composition for 30 seconds under a pressure of 5 tons.

7. The electrode active composition according to claim 1 , wherein the coating layer further contains B and B accounts for 500 ppm-3000 ppm in the second particles by weight.

8. The electrode active composition according to claim 1 , wherein
the lithium-containing compound is selected from the group consisting of: Li 2 O, LiOH, Li 2 CO 3 , LiNO 3 , LiPF 6 , lithium oxalate, lithium acetate, and any combinations thereof.

9. The electrode active composition according to claim 1 , wherein the sulfur-containing compound is selected from the group consisting of: mercaptan, thiophenol, thioether, thioaldehyde, thioketone, thionocarboxylic acid, sulphoxide, sulfone, sulfur oxoacid, R1-S(═O) 2 —R2, R1-C(═S)—R2,

R1-C—S—C—R2, R1-S(═O) 2 —LiN—S(═O) 2 —R2, sulfamide, sulfamic acid, lithium bisfluorosulfonimide, thiopropionamide, thioisobutyramide, propylene sulfide, methyl ethyl sulfide, or and any combination thereof, wherein R1 and R2 are each independently selected from the group consisting of hydroxyl, amino, C 1-6 alkyl, aryl, a halogen atom selected from the group consisting of F, Cl, Br, and I, and a hydrogen atom.

10. 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 Li x Co y M 1 (1-y) O 2 , wherein x satisfies 0.95≤x≤1.05, y satisfies 0.8≤y≤1, and M 1 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.

11. The method according to claim 10 , further comprising: mixing the first lithium cobalt oxide particles and the second lithium cobalt oxide particles to obtain the plurality of first particles,
wherein a particle size D v 50 of the first lithium cobalt oxide particles is 17 μm-21 μm;
a particle size D v 50 of the second lithium cobalt oxide particles is 4 μm-8 μm; and
a weight ratio of the first lithium cobalt oxide particles to the second lithium cobalt oxide particles is 3:1 to 15:1.

12. The method according to claim 10 , wherein the core further comprises an alkaline lithium-containing compound on the su

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Guan Yingjie
• Liu Yongchao
• Huang Qisen
• Liu Na
• Liang Chengdu

Classifications

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title