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

Patent metadata

Field	Value
Publication number	US-2025246629-A1
Application number	US-202418896667-A
Country	US
Kind code	A1
Filing date	Sep 25, 2024
Priority date	Jan 30, 2024
Publication date	Jul 31, 2025
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 current collector, a negative active material layer including an expansion reduction binder, a rubber binder, and a negative active material; and a functional layer between the current collector and the negative active material layer, wherein an amount of the expansion reduction binder is about 0.3 wt % to about 1 wt % based on 100 wt % of the negative active material layer, and an amount of the rubber binder is about 1 wt % to about 1.5 wt % based on 100 wt % of the negative active material layer.

First claim

what is claimed is:

1 . A negative electrode for a rechargeable lithium battery, comprising:
a current collector; a negative active material layer comprising an expansion reduction binder, a rubber binder, and a negative active material; and a functional layer between the current collector and the negative active material layer, wherein an amount of the expansion reduction binder is about 0.3 wt % to about 1 wt % based on 100 wt % of the negative active material layer, and an amount of the rubber binder is about 1 wt % to about 1.5 wt % based on 100 wt % of the negative active material layer.

2 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the expansion reduction binder comprises an acryl-included copolymer.

3 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the acryl-included copolymer comprises an acrylic acid first monomer, an acrylonitrile second monomer, and an ethyleneglycol group and/or sulfonate group-included (meth)acrylate third monomer.

4 . The negative electrode for a rechargeable lithium battery as claimed in claim 3 , wherein the acrylic acid first monomer comprises (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.

5 . The negative electrode for a rechargeable lithium battery as claimed in claim 4 , wherein in the metal salts of the (meth)acrylic acid, the metal comprises alkali metals and/or alkaline-earth metals.

6 . The negative electrode for a rechargeable lithium battery as claimed in claim 4 , wherein the metal salts of the (meth)acrylic acid comprises sodium acrylate, lithium acrylate, potassium acrylate, calcium acrylate, magnesium acrylate, sodium methacrylate, lithium methacrylate, potassium methacrylate, calcium methacrylate, or a combination thereof.

7 . The negative electrode for a rechargeable lithium battery as claimed in claim 4 , wherein the metal salts of the (meth)acrylic acid has a substitution degree with metal ions of about 20 mol % to about 100 mol %.

8 . The negative electrode for a rechargeable lithium battery as claimed in claim 3 , wherein the (meth)acrylate third monomer has a weight average molecular weight (Mw) of less than about 3000 g/mol.

9 . The negative electrode for a rechargeable lithium battery as claimed in claim 8 , wherein the (meth)acrylate third monomer has a weight-average-molecular weight (Mw) of about 200 g/mol to about 1000 g/mol.

10 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the (meth)acrylate third monomer comprises a polyethylene glycol methacrylate monomer.

11 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the sulfonate third monomer comprises sodium styrene sulfonate.

12 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the rubber binder comprises a styrene-butadiene rubber, a (meth)acrylated styrene-butadiene rubber, a (meth)acrylonitrile-butadiene rubber, a (meth)acryl rubber, a butyl rubber, a fluorine rubber, or a combination thereof.

13 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the functional layer comprises a carbon-based material and a binder.

14 . The negative electrode for a rechargeable lithium battery as claimed in claim 13 , wherein the carbon-based material comprises crystalline carbon, amorphous carbon, or a combination thereof.

15 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative active material layer further comprises a cellulose compound.

16 . The negative electrode for a rechargeable lithium battery as claimed in claim 15 , wherein the cellulose compound comprises carboxymethyl cellulose, hydroxypropylmethyl cellulose, methyl cellulose, an alkali metal salts thereof, or a combination thereof.

17 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative active material comprises a silicon-based negative active material.

18 . The negative electrode for a rechargeable lithium battery as claimed in claim 17 , wherein the silicon-based negative active material comprises silicon and carbon.

19 . 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

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

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/622 Primary

  being polymers · CPC title

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title