Conductive material dispersion for rechargeable lithium battery, electrode slurry including the conductive material dispersion, and rechargeable lithium battery including the conductive material dispersion

Patent metadata

Field	Value
Publication number	US-2025323271-A1
Application number	US-202418984568-A
Country	US
Kind code	A1
Filing date	Dec 17, 2024
Priority date	Apr 16, 2024
Publication date	Oct 16, 2025
Grant date	—

Abstract

Example embodiments relate to conductive material dispersions, electrode slurries, and rechargeable lithium batteries. The conductive material dispersion includes a conductive material, a solvent, and a dispersant. A particle size distribution graph of the conductive material dispersion includes a first peak that appears in a particle size range of equal to or less than about 0.1 μm, and a second peak that appears in a particle size range of greater than about 0.1 μm. A ratio of the maximum intensity of the first peak to the maximum intensity of the second peak B is in a range of about 30 to about 60.

First claim

What is claimed is:

1 . A conductive material dispersion for a rechargeable lithium battery, the conductive material dispersion comprising:
a conductive material; a solvent; and a dispersant, wherein a particle size distribution graph of the conductive material dispersion comprises: a first peak at a particle size range that is equal to or less than about 0.1 μm; and a second peak at a particle size range that is greater than about 0.1 μm, wherein a maximum intensity of the first peak is A, wherein a maximum intensity of the second peak is B, and wherein A and B satisfy Equation 1 below,

3
⁢
0

≤

A
/
B

≤

6
⁢
0

.

[

Equation
⁢

1

]

2 . The conductive material dispersion of claim 1 , wherein
the maximum intensity of the first peak is between about 10 vol % and about 20 vol %, and the maximum intensity of the second peak is between about 0.1 vol % and about 5 vol %.

3 . The conductive material dispersion of claim 1 , wherein, when a particle size distribution of the conductive material dispersion is measured, the particle size distribution Dmax satisfies Equation 2,

0.1

μm

≤

D
⁢
max

≤

10
⁢

μm
.

[

Equation
⁢

2

]

4 . The conductive material dispersion of claim 1 , wherein a specific surface area of the conductive material is in a range of about 260 m 2 /g to about 1,000 m 2 /g.

5 . The conductive material dispersion of claim 1 , wherein the conductive material comprises at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjenblack, carbon fiber, carbon nano-fiber, and carbon nano-tube.

6 . The conductive material dispersion of claim 1 , wherein the conductive material comprises a carbon nano-tube.

7 . The conductive material dispersion of claim 6 , wherein the carbon nano-tube comprises at least one of single-walled carbon nano-tubes, double-walled carbon nano-tubes, and multi-walled carbon nano-tubes.

8 . The conductive material dispersion of claim 6 , wherein an average length of the carbon nano-tube is equal to or less than about 100 μm.

9 . The conductive material dispersion of claim 6 , wherein an average diameter of the carbon nano-tube is in a range of about 1 nm to about 1 μm.

10 . The conductive material dispersion of claim 6 , wherein an amount of the carbon nano-tube is about 1 wt % to about 5 wt % relative to a total 100 wt % of the conductive material dispersion for the rechargeable lithium battery.

11 . The conductive material dispersion of claim 1 , wherein the solvent comprises at least one of water, dimethylformamide, diethylformamide, dimethylacetamide (DMAc), and N-methylpyrrolidone (NMP).

12 . The conductive material dispersion of claim 1 , wherein an amount of the dispersant is about 0.1 wt % to about 30 wt % relative to a total 100 wt % of the conductive material dispersion for the rechargeable lithium battery.

13 . An electrode slurry for a rechargeable lithium battery, the electrode slurry comprising:
an electrode active material; a binder; and a conductive material dispersion, wherein a particle size distribution graph of the conductive material dispersion comprises: a first peak at a particle size range that is equal to or less than about 0.1 μm; and a second peak at a particle size range that is greater than about 0.1 μm, wherein a maximum intensity of the first peak is A, wherein a maximum intensity of the second peak is B, and wherein A and B satisfy Equation 1,

3
⁢
0

≤

A
/
B

≤

6
⁢
0

.

[

Equation
⁢

1

]

14 . The electrode slurry of claim 13 , wherein the binder comprises a hydrogenated nitrile butadiene rubber (HNBR) derivative.

15 . The electrode slurry of claim 13 , wherein the binder comprises at least one of polyvinylidenefluoride, derivatives of the polyvinylidenefluoride, and copolymers of the polyvinylidenefluoride.

16 . The electrode slurry of claim 13 , wherein the binder comprises at least one of poly(meth)acrylic acid, poly(meth)acrylate, polymethyl(meth)acrylate, polyacrylonitrile, and acrylonitrile-styrene-butadiene copolymers.

17 . The electrode slurry of claim 13 , wherein the electrode active material comprises a positive electrode active material.

18 . The electrode slurry of claim 13 , wherein the electrode active material comprises a negative electrode active material.

19 . A rechargeable lithium battery, comprising:
an electrode; and an electrolyte, wherein the electrode comprises:
a current collector; and
an active material layer comprising the electrode slurry for the rechargeable lithium battery as set forth in claim 13 .

20 . The rechargeable lithium battery of claim 19 , wherein
the electrode comprises a positive electrode and a negative electrode, and a separa

Assignees

• Samsung Sdi Co Ltd

Inventors

• Yang Mihwa
• Kim Minjae

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/624 Primary

  Electric conductive fillers · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/028

  Positive electrodes · CPC title