NEGATIVE ELECTRODE FOR RECHARGEABLE LITHIUM BATTERY AND RECHARGEABLE LITHIUM BATTERY INCLUDING SAME

• US 20190326600A1
• Filed: 04/22/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: PARK, Yoonsoo, KIM, Taesik, EOM, Jae-Hyeon
• Granted Patent: US 11,018,340 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A negative electrode for a rechargeable lithium battery includes a negative active material layer including a negative active material, and a current collector supporting the negative active material layer. The negative active material may include first spherical crystalline carbon, the first spherical crystalline carbon including secondary particles in which primary particles of crystalline carbon are assembled, the first spherical crystalline carbon having a coating of crystalline carbon, second spherical crystalline carbon, the second spherical crystalline carbon including secondary particles in which primary particles of crystalline carbon are assembled, the second spherical crystalline carbon having a coating of amorphous carbon, and flake-shaped graphite.

Claims

1. A negative electrode for a rechargeable lithium battery, comprising:

a negative active material layer including a negative active material; and

a current collector supporting the negative active material layer,

wherein the negative active material includes;

first spherical crystalline carbon, the first spherical crystalline carbon including secondary particles in which primary particles of crystalline carbon are assembled, the first spherical crystalline carbon having a coating of crystalline carbon;

second spherical crystalline carbon, the second spherical crystalline carbon including secondary particles in which primary particles of crystalline carbon are assembled, the second spherical crystalline carbon having a coating of amorphous carbon; and

flake-shaped graphite.

2. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein in the negative active material layer, the flake-shaped graphite is disposed between the first spherical crystalline carbon and the second spherical crystalline carbon, and the first spherical crystalline carbon and the second spherical crystalline carbon are in direct contact with the flake-shaped graphite.

3. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an average particle diameter (D50) of the flake-shaped graphite is about 1 μ

m to about 10 μ

m.

4. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an average particle diameter (D50) of the flake-shaped graphite is about 3 μ

m to about 7 μ

m.

5. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an amount of the flake-shaped graphite in the negative active material is about 1 wt % to about 10 wt % based on a total weight of the negative active material.

6. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an amount of the first spherical crystalline carbon in the negative active material is about 10 wt % to about 80 wt % based on a total weight of the negative active material.

7. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an amount of the second spherical crystalline carbon in the negative active material is about 10 wt % to about 80 wt % based on a total weight of the negative active material.

8. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein an amount of the negative active material in the negative active material layer is about 96 wt % to about 99 wt % based on a total weight of the negative active material layer.

9. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein a loading level of the negative active material layer is about 15 mg/cm² or more.

10. The negative electrode for a rechargeable lithium battery as claimed in claim 1, wherein a loading level of the negative active material layer is about 15 mg/cm² to about 40 mg/cm².

11. A rechargeable lithium battery, comprising:

the negative electrode as claimed in claim 1;

a positive electrode including a positive active material; and

a non-aqueous electrolyte.

12. A negative electrode for a rechargeable lithium battery, comprising:

a current collector; and

a negative active material on the current collector, the negative active material including;

flake-shaped graphite;

first particles, the first particles being an assembly of primary particles of crystalline carbon particles, the first particles including a coating of crystalline carbon on the assembled primary particles; and

second particles, the second particles being an assembly of crystalline carbon particles, the second particles including a coating of amorphous carbon on the assembled primary particles.