IP Library › Granted Patent US 12,237,510
Granted Patent B2
US 12,237,510 · App. 18/226,906 · Granted Feb 25, 2025

Negative electrode for a rechargeable lithium battery and rechargeable lithium battery including the same

Inventors: Jinhyon Lee (Suwon-si, KR); Bokhyun Ka (Suwon-si, KR); Kyeuyoon Sheem (Suwon-si, KR); Soonho Ahn (Suwon-si, KR)
Assignee: SAMSUNG SDI CO., LTD.
H01M4/587H01M10/0525H01M2004/021H01M2004/027
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Quick Facts
Patent No.
US 12,237,510
App. No.
18/226,906
Granted
Feb 25, 2025
Kind
B2
Abstract

A negative electrode and a rechargeable lithium battery, the negative electrode including a current collector; and a negative active material layer on the current collector, the negative active material including a carbon negative active material; wherein: an electrode density of the negative electrode is in the range of about 1.0 g/cc to about 1.5 g/cc, and a DD (Degree of Divergence) value as defined by the following Equation 1 is about 24 or greater, DD (Degree of Divergence)=( I a /I total )*100  [Equation 1] wherein, in Equation 1, I a is a sum of peak intensities at non-planar angles measured by XRD using a CuKα ray, and I total is a sum of peak intensities at all angles measured by XRD using a CuKα ray.

Claims (29)

1. A rechargeable lithium battery, comprising:

a positive electrode; and

a negative electrode, the negative electrode including:

a current collector; and

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

wherein:

the negative electrode is larger than the positive electrode;

an electrode density of the negative electrode is about 1.0 g/cc to about 1.5 g/cc, and

a DD (Degree of Divergence) value as defined by the following Equation 1 is about 24 or greater,

DD (Degree of Divergence)=( I a /I total )*100  [Equation 1]

in Equation 1,

I a is a sum of peak intensities at 2θ=42.4±0.2°, 43.4±0.2° 44.6±0.2°, and 77.5±0.2° measured by XRD using a CuKα ray, and

I total is a sum of peak intensities at 2θ=26.5±0.2°, 42.4±0.2°, 43.4±0.2°, 44.6±0.2°, 54.7±0.2° and 77.5±0.2° measured by XRD using a CuKα ray.

2. The rechargeable lithium battery as claimed in claim 1 , wherein the DD value of the negative electrode is about 24 to about 70.

3. The rechargeable lithium battery as claimed in claim 1 , wherein the DD value of the negative electrode is about 24 to about 60.

4. The rechargeable lithium battery as claimed in claim 1 , wherein the electrode density of the negative electrode is about 1.0 g/cc to about 1.4 g/cc.

5. The rechargeable lithium battery as claimed in claim 1 , wherein the electrode density of the negative electrode is about 1.0 g/cc to about 1.2 g/cc.

6. The rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode has a single surface loading level (L/L) of about 6 mg/cm 2 to about 65 mg/cm 2 .

7. The rechargeable lithium battery as claimed in claim 1 , wherein the negative active material layer has a thickness of a single surface except a substrate of about 40 μm to about 650 μm.

8. The rechargeable lithium battery as claimed in claim 7 , wherein the negative active material layer has a thickness of a single surface except a substrate of about 40 μm to about 450 μm.

9. The rechargeable lithium battery as claimed in claim 7 , wherein the negative active material layer has a thickness of a single surface except a substrate of about 40 μm to about 200 μm.

10. The rechargeable lithium battery as claimed in claim 1 , wherein the peak intensities are peak integral area values.

11. The rechargeable lithium battery as claimed in claim 1 , wherein the carbon negative active material is artificial graphite or a mixture of artificial graphite and natural graphite.

12. The rechargeable lithium battery as claimed in claim 1 , wherein the negative active material layer further includes a Si negative active material, a Sn negative active material, a lithium vanadium oxide, or a combination thereof.

13. The rechargeable lithium battery as claimed in claim 1 , wherein:

the negative electrode has an active region facing a positive electrode and an inactive region not facing the positive electrode, and

a DD value of the inactive region is about 24 or greater.

14. The rechargeable lithium battery as claimed in claim 1 , wherein the rechargeable lithium battery is part of an electric vehicle.

15. The rechargeable lithium battery as claim in claim 1 , wherein the rechargeable lithium battery is part of one of a power tool and a vacuum cleaner.

Priority Claims (1)
KR 10-2018-0046210 · Apr 20, 2018 · national
Continuity (3)
Continuation 17537765 · Nov 30, 2021
Continuation 16382331 · Apr 12, 2019
Related Publication 20230369593A1 · Nov 16, 2023
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