# US 12,191,489 B2 · Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

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- Number: US 12,191,489 B2
- Document ID: US12191489B2
- Status: Granted
- Kind: B2
- Application number: 17/190,863
- Filed: 2021-03-03
- Published: 2021-09-09
- Granted: 2025-01-07
- Earliest claimed: 2020-03-03
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Sunil Park; Narae Kim; Jaehou Nah; Joongho Moon; Hyun Soh; Eunjoo Lee
- Web page: https://patentgrep.com/patent/US12191489B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/043: {involving compressing or compaction}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- 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 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- 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

A negative active material for a rechargeable lithium battery includes a secondary particle in which a plurality of natural graphite primary particles are agglomerated, the plurality of primary particles including natural graphite, and the secondary particle including pores, and an amorphous carbon positioned in the pores, wherein an area of the amorphous carbon is about 10% to about 30% based on a total area of 100% of the negative active material, in a cross-section of the negative active material.

## Claims

### Claim 1

A negative active material for a rechargeable lithium battery, the negative active material comprising:
a secondary particle in which a plurality of primary particles are agglomerated, the plurality of primary particles comprising natural graphite, and the secondary particle comprising pores; and
an amorphous carbon filled in the pores,
wherein an area of the amorphous carbon is 10% to 30% based on a total area of 100% of the negative active material, in a cross-section through a center diameter of the secondary particle of the negative active material, and
wherein the natural graphite is flake graphite.

### Claim 2 (depends on 1)

The negative active material of claim 1, wherein each primary particle of the plurality of primary particles has a particle diameter of about 5 μm to about 15 μm.

### Claim 3 (depends on 1)

The negative active material of claim 1, wherein the secondary particle has a particle diameter of about 8 μm to about 24 μm.

### Claim 4 (depends on 1)

The negative active material of claim 1, wherein the natural graphite is flake graphite having a long axis and a short axis, and a length of the long axis is about 5 μm to about 15 μm.

### Claim 5 (depends on 1)

The negative active material of claim 1, wherein the secondary particle further comprises the amorphous carbon on a surface of the secondary particle.

### Claim 6 (depends on 1)

The negative active material of claim 1, wherein the negative active material comprises the amorphous carbon at an amount of about 1 wt % to about 9 wt % based on a total weight of 100 wt % of the negative active material.

### Claim 7 (depends on 1)

A rechargeable lithium battery, comprising:
a negative electrode comprising the negative active material of claim 1;
a positive electrode comprising a positive active material; and
an electrolyte between the negative electrode and the positive electrode.