Binder for lithium rechargeable battery, electrode including the same, and lithium rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-2026058153-A1
Application number	US-202519306439-A
Country	US
Kind code	A1
Filing date	Aug 21, 2025
Priority date	Aug 22, 2024
Publication date	Feb 26, 2026
Grant date	—

Abstract

Examples of the disclosure include a binder for a rechargeable lithium battery, and an electrode and a rechargeable lithium battery including the binder, the binder including a core-shell structured particle-shaped binder and a linear binder, wherein at least one of the core-shell structured particle-shaped binder and the linear binder includes a desired structural unit.

First claim

What is claimed is:

1 . A binder for a rechargeable lithium battery, the binder comprising a core-shell structured particle-shaped binder and a linear binder,
wherein the core-shell structured particle-shaped binder comprises: a core including a first structural unit derived from a (C1-C20) alkyl or (C2-C20) alkenyl (meth)acrylate monomer, a second structural unit derived from an aromatic vinyl monomer, and a third structural unit derived from a di(meth)acrylate monomer; and a shell including a fourth structural unit derived from a (meth)acrylic acid-based monomer or a salt thereof, a fifth structural unit derived from a (meth)acrylonitrile-based monomer, and a sixth structural unit derived from an aromatic vinyl sulfonate-based monomer or a salt thereof, and the linear binder comprises: a seventh structural unit derived from a (meth)acrylic acid-based monomer or a salt thereof, an eighth structural unit derived from a (meth)acrylonitrile-based monomer, and a ninth structural unit derived from a zwitterionic monomer.

2 . The binder as claimed in claim 1 , wherein:
the first structural unit is represented by Chemical Formula 1, the second structural unit is represented by Chemical Formula 2, and the third structural unit is represented by Chemical Formula 3:

wherein, in Chemical Formula 1,
R 1 comprises a hydrogen atom or a C1 to C20 alkyl group; and
R 2 comprises a substituted or unsubstituted C1 to C20 alkyl group, or a substituted or unsubstituted C2 to C20 alkenyl group,

wherein, in Chemical Formula 2,
R 3 comprises a hydrogen atom, or a C1 to C20 alkyl group; and
R 4 comprises a substituted or unsubstituted C6 to C20 aryl group,

wherein, in Chemical Formula 3,
R 5 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group; and
m is an integer in a range of 1 to 100.

3 . The binder as claimed in claim 1 , wherein based on 100 wt % of a total amount of the core, the first structural unit is included in an amount in a range of about 35 wt % to about 60 wt %, the second structural unit is included in an amount in a range of about 35 wt % to about 60 wt %, and the third structural unit is included in an amount in a range of about 0.01 wt % to about 5 wt %.

4 . The binder as claimed in claim 1 , wherein:
the fourth structural unit is represented by Chemical Formula 4-1 or 4-2, the fifth structural unit is represented by Chemical Formula 5, and the sixth structural unit is represented by Chemical Formula 6-1 or 6-2:

wherein, in Chemical Formulas 4-1 and 4-2,
R 6 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group; and
M1 comprises an alkali metal,

wherein, in Chemical Formula 5,
R 7 comprises a hydrogen atom or a C1 to C20 alkyl group,

wherein, in Chemical Formulas 6-1 and 6-2,
R 8 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group;
L 1 is the same or different and independently comprises a substituted or unsubstituted C6 to C20 arylene group; and
M2 comprises an alkali metal.

5 . The binder as claimed in claim 1 , wherein based on 100 wt % of a total amount of the shell, the fourth structural unit is included in an amount in a range of about 25 wt % to about 60 wt %, the fifth structural unit is included in an amount in a range of about 25 wt % to about 47 wt %, and the sixth structural unit is included in an amount in a range of about 3 wt % to about 35 wt %.

6 . The binder as claimed in claim 1 , wherein a weight ratio of the core and the shell in the core-shell structured particle-shaped binder is in a range of about 100:0.1 to about 100:20.

7 . The binder as claimed in claim 1 , wherein an average particle diameter (D50) of the core-shell structured particle-shaped binder is in a range of about 450 nm to about 1500 nm.

8 . The binder as claimed in claim 1 , wherein:
the seventh structural unit is represented by Chemical Formula 7-1 or 7-2, the eighth structural unit is represented by Chemical Formula 8, and the ninth structural unit is represented by Chemical Formula 9-1 or 9-2:

wherein, in Chemical Formulas 7-1 and 7-2,
R 9 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group; and
M3 comprises an alkali metal,

wherein, in Chemical Formula 8,
R 10 comprises a hydrogen atom or a C1 to C20 alkyl group, Chemical Formula 9-1:

wherein, in Chemical Formulas 9-1 and 9-2,
R 11 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group;
R 12 is the same or different and independently comprises a hydrogen atom or a C1 to C20 alkyl group;
L 2 comprises *—(C═O)—NR 12 —CH 2 —* or *—(C═O)—O—*; and
L 3 to L 5 each independently comprises a single bond or a C1 to C20 alkylene group.

9 . The binder as claimed in claim 1 , wherein the seventh structural unit is included in an amount in a range of about 30 wt % to about 60 wt %, the eighth structural unit is included in an amount in a range of about 32 wt % to about 55 wt %, and the ninth structural unit is included in an amount in a range of about 1 wt % to about 15 wt %, based on 100 wt % of a total amount of the linear binder.

10 . The binder as claimed in claim 1 , wherein the linear binder further includes a tenth structural unit derived from a (C1-C10) alkylene glycol-based monomer or a salt thereof.

11 . The binder as claimed in claim 10 , wherein the tenth structural unit is represented by Chemical Formula 10-1 or 10-2:

wherein, in Chemical Formulas 10-1 and 10-2,
M4 comprises an alkali metal, and
n is an integer in a range of 1 to 100.

12 . The binder as claimed in claim 10 , wherein based on 100 wt % of a total amount of the linear binder, the tenth structural unit is included in an amount in a range of about 0.1 wt % to about 15 wt %.

13 . The binder as claimed in claim 1 , wherein a weight ratio of the core-shell structured particle-shaped binder to the linear binder is in a range of about 100:1 to about 1:1.

14 . An electrode for a rechargeable lithium battery, the electrode comprising:
the binder as claimed in claim 1 ; and an electrode active material.

15 . The electrode as claimed in claim 14 , wherein the electrode is a negative electrode.

16 . A rechargeable lithium

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Kukjoo
• Cho Yunshik
• Choi Jewon
• Park Sujin
• Cho Minho
• Jung Kyunghwa

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C08F12/30

  Sulfur · CPC title

• C08F212/08

  Styrene · CPC title