Conductive material dispersion for rechargeable lithium battery, negative electrode prepared using same, and rechargeable lithium battery including negative electrode

Patent metadata

Field	Value
Publication number	US-2023116257-A1
Application number	US-202217937898-A
Country	US
Kind code	A1
Filing date	Oct 4, 2022
Priority date	Oct 5, 2021
Publication date	Apr 13, 2023
Grant date	—

Abstract

Disclosed is a conductive material dispersion for a rechargeable lithium battery, a negative electrode prepared using the same, and a conductive material dispersion including carbon nanotubes, wherein the conductive material dispersion has a viscosity of about 10,000 cps or less, and wherein in a graph showing a particle size distribution of the dispersion, when A is a maximum peak intensity shown in a range of a particle size of about 0.5 µm or less and B is a maximum peak intensity shown in a range of a particle size of less than about 0.5 µm, the A and the B satisfy the relationship of Equation 1.A/B<1

First claim

What is claimed is:

1 . A conductive material dispersion for a rechargeable lithium battery, comprising:
carbon nanotubes, wherein the conductive material dispersion has a viscosity of about 10,000 cps or less, and wherein in a graph showing a particle size distribution of the conductive material dispersion, when A is a maximum peak intensity occurring in a particle size range of about 0.5 µm or less, and B is a maximum peak intensity occurring in a particle size range of more than about 0.5 µm, the A and the B satisfy a relationship of Equation 1, Equation 1 A/B < 1.

2 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the A/B of Equation 1 is about 0.2 to about 0.8.

3 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the conductive material dispersion has a viscosity of about 1000 cps to about 10,000 cps.

4 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein an amount of the carbon nanotubes is about 0.4 wt% to about 2.0 wt% based on a total of 100 wt% of the conductive material dispersion.

5 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the carbon nanotubes are single-walled carbon nanotubes, multi-walled carbon nanotubes, or a combination thereof.

6 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the carbon nanotubes have an average length of about 10 µm or less.

7 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the carbon nanotubes have an average diameter of about 1 nm to about 5 nm.

8 . The conductive material dispersion for a rechargeable lithium battery of claim 1 , wherein the A is about 0.1 volume% to about 15 volume% and the B is about 1 volume% to about 20 volume%.

9 . A negative electrode for a rechargeable lithium battery prepared by using the conductive material dispersion of claim 1 .

10 . The negative electrode for a rechargeable lithium battery of claim 9 , wherein the negative electrode comprises a silicon and carbon composite negative active material.

11 . A rechargeable lithium battery, comprising:
the negative electrode of claim 9 , a positive electrode; and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Minjae
• Seol Jongheon
• Nam Junghyun
• Han Sungsoo

Classifications

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title