# US 12,191,492 B2 · Anode for lithium secondary battery and lithium secondary battery including the same

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- Number: US 12,191,492 B2
- Document ID: US12191492B2
- Status: Granted
- Kind: B2
- Application number: 18/464,619
- Filed: 2023-09-11
- Published: 2024-03-28
- Granted: 2025-01-07
- Earliest claimed: 2022-09-27
- Assignees: SK On Co., Ltd.
- Applicants: SK On Co., Ltd.
- Inventors: So Hyun Park; Kyung Hoon Kim; Chan Young Jeon
- Web page: https://patentgrep.com/patent/US12191492B2

## CPC

- H01M 4/587: for inserting or intercalating light metals
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/364: {as mixtures}
- H01M 10/052: Li-accumulators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An anode active material for a secondary battery according to an embodiment of the present disclosure includes an anode current collector, and an anode active material layer on at least one surface of the anode current collector. The anode active material layer includes an anode active material that includes a natural graphite and an artificial graphite. The artificial graphite has a form of single particles. An orientation index expressed as I(004)/I(110) is 15 or less.

## Claims

### Claim 1

An anode for a lithium secondary battery, comprising:
an anode current collector; and
an anode active material layer on at least one surface of the anode current collector, the anode active material layer comprising an anode active material that comprises a natural graphite and an artificial graphite, the artificial graphite having a form of single particles,
wherein an orientation index defined by Equation 1 is 15 or less:
Orientation Index=I(004)/I(110) [Equation 1]
wherein, in Equation 1, I(004) is a peak intensity of a (004) plane of the anode active material layer measured by an X-ray diffraction (XRD) analysis, and I(110) is a peak intensity of a (110) plane of the anode active material layer measured by the XRD analysis, and
wherein an irregularity degree defined by Equation 2 of the artificial graphite is in a range from 1.7 to 2.2:
IrregularityDegree=Da/D50 [Equation 2]
where, in Equation 2, Da is a value (μm) obtained by dividing a circumference of the artificial graphite measured by a particle size analyzer by π, and D50 is a volume average particle diameter (μm) of the artificial graphite.

### Claim 2 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein a content of the artificial graphite is in a range from 60 wt % to 80 wt % based on a sum of weights of the artificial graphite and the natural graphite.

### Claim 3 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein the orientation index is in a range from 5 to 13.

### Claim 4 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein D50 in Equation 2 is in a range from 3 μm to 10 μm.

### Claim 5 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein Da in Equation 2 is in a range from 10 μm to 16 μm.

### Claim 6 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein a volume average particle diameter (D50) of the natural graphite is in a range from 3 μm to 15 μm.

### Claim 7 (depends on 1)

The anode for a lithium secondary battery according to claim 1, further comprising a carbon coating covering at least a portion of a surface of at least one of the artificial graphite and the natural graphite.

### Claim 8 (depends on 1)

The anode for a lithium secondary battery according to claim 1, wherein a thickness change ratio defined by Equation 3 is in a range from 2% to 9%:
Thickness Change Ratio (%)={(T1-T2)/(T2-T3)}*100
wherein, in Equation 3, T1 is a thickness of the anode for a lithium secondary battery when in a fully charged state, T2 is a thickness of the anode for a lithium secondary battery in a fully discharged state, and T3 is a thickness of the anode current collector.

### Claim 9 (depends on 1)

A lithium secondary battery, comprising:
a cathode; and
the anode for a lithium secondary battery of claim 1 facing the cathode.