Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-2026018618-A1
Application number	US-202519262810-A
Country	US
Kind code	A1
Filing date	Jul 8, 2025
Priority date	Jul 9, 2024
Publication date	Jan 15, 2026
Grant date	—

Abstract

Disclosed are a negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The negative electrode for the rechargeable lithium battery includes a negative active material layer including a Si-including negative active material, a binder, a linear carbon conductive material, a dispersant, an additive having one or more OH functional groups (multifunctional hydroxyl group) and being capable of adsorbing to a surface of the dispersant.

First claim

What is claimed is:

1 . A negative electrode for a rechargeable lithium battery, comprising;
a negative active material layer comprising a Si-including negative active material, a binder, a linear carbon conductive material, a dispersant, an additive having one or more OH functional groups and being capable of adsorbing to a surface of the dispersant, wherein the binder is a copolymer comprising an acryl group and a cyano group.

2 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the additive is a polyphenol compound, a polysaccharide compound, or a combination thereof.

3 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the additive is tannin, pyrogallol, lignin, hyaluronic acid, or a combination thereof.

4 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the dispersant has a weight average molecular weight (Mw) of about 30,000 Dalton or more.

5 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the binder is an expansion reduction binder.

6 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the copolymer comprises a first monomer, a second monomer, and a third monomer,
the first monomer comprises an acryloyl group, the second monomer comprises a cyano group, and the third monomer comprises an acrylate group.

7 . The negative electrode for a rechargeable lithium battery as claimed in claim 6 , wherein an amount of the first monomer is about 40 wt % to about 60 wt % based on 100 wt % of the copolymer.

8 . The negative electrode for a rechargeable lithium battery as claimed in claim 6 , wherein the first monomer is (meth)acrylic acid, metal salts of (meth)acrylic acid, ammonium salts of (meth)acrylic acid, amine salts of (meth)acrylic acid, or a combination thereof.

9 . The negative electrode for a rechargeable lithium battery as claimed in claim 8 , wherein in the metal salts of the (meth)acrylic acid, the metal is an alkali metal, an alkaline-earth metal, or a combination thereof.

10 . The negative electrode for a rechargeable lithium battery as claimed in claim 8 , wherein the metal salts of the (meth)acrylic acid has a substitution degree with metal ions of about 20 mol % to about 100 mol %.

11 . The negative electrode for a rechargeable lithium battery as claimed in claim 6 , wherein the second monomer is acrylonitrile.

12 . The negative electrode for a rechargeable lithium battery as claimed in claim 6 , wherein the third monomer comprises a sulfonic acid group or an ethyleneglycol group including (meth)acrylate.

13 . The negative electrode for a rechargeable lithium battery as claimed in claim 12 , wherein the third monomer is 2-acrylamido-2-methyl-1-propanesulfonic acid, or a polyethyleneglycol methacrylate monomer.

14 . The negative electrode for a rechargeable lithium battery as claimed in claim 13 , wherein the third monomer is 2-acrylamido-2-methyl-1-propanesulfonic acid.

15 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the linear carbon conductive material is carbon nanotubes, carbon nanofiber, or a combination thereof.

16 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein an amount of the linear carbon conductive material is about 0.005 wt % to about 0.2 wt % based on 100 wt % of the negative active material layer.

17 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein an amount of the binder is about 0.5 wt % to 3 wt % based on 100 wt % of the negative active material layer.

18 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein an amount of the dispersant is about 0.009 wt % to about 0.35 wt % based on 100 wt % of the negative active material layer.

19 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein an amount of the additive is about 0.003 wt % to about 0.14 wt % based on 100 wt % of the negative active material layer.

20 . A rechargeable lithium battery, comprising:
a negative electrode as claimed in claim 1 ; a positive electrode; and a non-aqueous electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Jung Kyunghwa
• Cho Yunshik
• Lee Kukjoo
• Lee Junkyu
• Choi Mingu
• Im Eunhee
• Chae Wonhyung

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title