# US 2022/0045327 A1 · Anode active material and lithium secondary battery including the same

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- Number: US 2022/0045327 A1
- Document ID: US20220045327A1
- Status: Published application
- Kind: A1
- Application number: 17/394,679
- Filed: 2021-08-05
- Published: 2022-02-10
- Earliest claimed: 2020-08-05
- Assignees: SK Innovation Co., Ltd.
- Applicants: SK Innovation Co., Ltd.
- Inventors: Hae Suk HWANG; Hee Gyoung KANG; Hyo Sang Kim; So Hyun PARK; Jong Hyuk Lee
- Web page: https://patentgrep.com/patent/US20220045327A1

## CPC

- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- 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 4/364: {as mixtures}
- H01M 4/623: {fluorinated polymers}
- H01M 4/662: {Alloys (collectors of lead alloys H01M4/685)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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 according to an embodiment of the present invention includes a first graphite particle and a second graphite particle having a different particle diameter from that of the first graphite particle. A ratio of a pellet density relative to a. tap density of the anode active material is from 1.3 to 1.45. A particle deformation of the anode is suppressed to achieve a lithium secondary battery having improved long-term and high-energy properties.

## Claims

### Claim 1

An anode active material, comprising:
a first graphite particle; and
a second graphite particle having a different particle diameter from at of the first graphite particle,
wherein a pellet density and a tap density of the anode active material satisfy a relation of Equation 1:
1.3≤DP/DT≤1.45 [Equation 1]
wherein, in Equation 1, DP is the pellet density (g/cm3) of the anode active material, and DT is the tap density (g/cm3) of the anode active material, wherein, the pellet density is calculated using a height difference measured after putting 1 g of the anode active material into a cylindrical pelletizer with a diameter of 13 mm and pressurizing the pelletizer with 3 metric ton for 10 seconds,
wherein the tap density is measured from a volume and a weight of a sample obtained after filling the sample of log of the anode active material in 25 ml measuring cylinder, and then tapping with a stroke length of 10 mm 3,000 times.

### Claim 2 (depends on 1)

The anode active material of claim 1, wherein the second graphite particle includes artificial graphite having a hardness higher than that of the first graphite particle.

### Claim 3 (depends on 1)

The anode active material of claim 1, wherein an amount of the second graphite particle is in a range from 20 wt % to 40 wt % based on a total weight of the anode active material.

### Claim 4 (depends on 1)

The anode active material of claim 1, wherein the first graphite particle and the second graphite particle satisfy Equation 2:
0.3≤D2/D1≤0.56 [Equation 2]
wherein, in Equation 2, D1 is an average particle diameter (D50, um) of the first graphite particle, and D2 is an average particle diameter (D50, μm) of the second graphite particle.

### Claim 5 (depends on 1)

The anode active material of claim 1, wherein the average particle diameter (D50) of the first graphite particle is from 16 μm to 19 μm.

### Claim 6 (depends on 1)

The anode active material according to claim 1, wherein an average particle diameter (D50) of the second graphite particle is from 7 μm to 9 μm.

### Claim 7 (depends on 1)

The anode active material of claim 1, wherein the first graphite particle includes an assembly type artificial graphite.

### Claim 8 (depends on 1)

An anode mixture for a lithium secondary battery comprising the anode active material of claim 1 and having a density of 1.8 g/cm3 or more.

### Claim 9 (depends on 8)

The anode mixture for a lithium secondary battery of claim 8, further comprising a solvent, a conductive agent and a binder.

### Claim 10 (depends on 1)

An anode for a lithium secondary battery, comprising:
an anode current collector; and
an anode active material layer formed on the anode current collector, the anode active material layer comprising the anode active material of claim 1.

### Claim 11 (depends on 1)

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