# US 12,002,949 B2 · Negative electrode and secondary battery including the same

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- Number: US 12,002,949 B2
- Document ID: US12002949B2
- Status: Granted
- Kind: B2
- Application number: 16/652,283
- Filed: 2018-11-30
- Published: 2020-07-30
- Granted: 2024-06-04
- Earliest claimed: 2017-12-01
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hyun-Min Kim; Min-Kyung Kim; Jong-Heon Seol; Ki-Won Sung; Myung-Ki Lee; Eun-Ju Lee; Young-Eun Choi
- Web page: https://patentgrep.com/patent/US12002949B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/364: {as mixtures}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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 electrode including: a current collector; a first negative electrode active material layer positioned on at least one surface of the current collector for a negative electrode and containing a first carbonaceous active material; and a second negative electrode active material layer positioned on a surface of the first negative electrode active material layer and containing a silicon-based active material and carbon nanotubes. A lithium secondary battery including the negative electrode is also disclosed.

## Claims

### Claim 1

A negative electrode comprising:
a current collector;
a first negative electrode active material layer positioned on at least one surface of the current collector, wherein the first negative electrode active material layer comprises a first carbonaceous active material; and
a second negative electrode active material layer positioned on a surface of the first negative electrode active material layer, wherein the second negative electrode active material layer comprises a silicon-based active material and carbon nanotubes,
wherein the carbon nanotubes are positioned in a line contact mode and distributed homogeneously only on the surface of the silicon-based active material, and
wherein the second negative electrode active material layer further comprises a second carbonaceous active material.

### Claim 2 (depends on 1)

The negative electrode according to claim 1, wherein the carbon nanotubes are present in an amount of 0.1 wt % to 2 wt % based on a total weight of the first and second negative electrode active material layers.

### Claim 3 (depends on 1)

The negative electrode according to claim 1, wherein the carbon nanotubes are present in an amount of 1 part to 20 parts by weight based on 100 parts by weight of the silicon-based active material.

### Claim 4 (depends on 1)

The negative electrode according to claim 1, wherein the carbon nanotubes have an average diameter of 10 nm to 120 nm and an average length of 0.5 μm to 20 μm.

### Claim 5 (depends on 1)

The negative electrode according to claim 1, wherein the carbon nanotubes have a specific surface area of 100 m2/g to 3,000 m2/g.

### Claim 6 (depends on 1)

The negative electrode according to claim 1, wherein the silicon-based active material is present in an amount of 1 wt % to 30 wt % based on a total weight of the first and second negative electrode active material layers.

### Claim 7 (depends on 1)

The negative electrode according to claim 1, wherein the first negative electrode active material layer and the second negative electrode active material layer have a thickness ratio of 90:10 to 10:90.

### Claim 8 (depends on 1)

A lithium secondary battery comprising the negative electrode as defined in claim 1.

### Claim 9 (depends on 1)

The negative electrode according to claim 1, wherein the silicon-based active material consists of SiO particles.

### Claim 10

A negative electrode comprising:
a current collector;
a first negative electrode active material layer positioned on at least one surface of the current collector, wherein the first negative electrode active material layer comprises a first carbonaceous active material; and
a second negative electrode active material layer positioned on a surface of the first negative electrode active material layer, wherein the second negative electrode active material layer comprises a silicon-based active material and carbon nanotubes,
wherein the carbon nanotubes are positioned in a line contact mode and distributed homogeneously only on the surface of the silicon-based active material.