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

Patent metadata

Field	Value
Publication number	US-2025118747-A1
Application number	US-202418676348-A
Country	US
Kind code	A1
Filing date	May 28, 2024
Priority date	Oct 6, 2023
Publication date	Apr 10, 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 includes a negative electrode active material, a cellulose-based compound, and a binder, and an amount of Na in the negative electrode is about 200 ppm to about 600 ppm.

First claim

What is claimed is:

1 . A negative electrode for a rechargeable lithium battery, comprising:
a negative electrode active material, a cellulose-based compound, and a binder, wherein an amount of sodium (Na) in the negative electrode is about 200 ppm to about 600 ppm.

2 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the amount of Na is about 200 ppm to about 400 ppm.

3 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the cellulose-based compound comprises carboxymethyl cellulose, hydroxypropylmethyl cellulose, methyl cellulose, an alkali metal salt thereof, or a combination thereof.

4 . The negative electrode for a rechargeable lithium battery as claimed in claim 3 , wherein the alkali salt is a Na salt, a K salt, a Li salt, or a combination thereof.

5 . The negative electrode for a rechargeable lithium battery as claimed in claim 3 , wherein the cellulose-based compound comprises a carboxymethyl cellulose lithium salt, or a mixture of a carboxymethyl cellulose lithium salt and a carboxymethyl cellulose sodium salt.

6 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the amount of the sodium is a value measured via an inductively Coupled Plasma Mass Spectrometery method.

7 . The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode active material comprises a carbon-based negative electrode active material, a silicon-based negative electrode active material, or a combination thereof.

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

9 . The negative electrode for a rechargeable lithium battery as claimed in claim 8 , wherein the aqueous binder comprises a styrene-butadiene rubber (SBR), an acrylated styrene-butadiene rubber (ABR), an acrylonitrile-butadiene rubber, an acryl rubber, a butyl rubber, a fluorine rubber, an ethylene oxide-containing polymer, polyvinyl pyrrolidone, polypropylene, polyepichlorohydrin, polyphosphazene, an ethylene propylenediene copolymer, polyvinyl pyridine, chlorosulfonated polyethylene, latex, a polyester resin, an acrylic resin, a phenol resin, an epoxy resin, polyvinyl alcohol, a copolymer of (meth)acrylic acid, a copolymer of (meth)acrylic acid salt, (meth)acrylonitrile, or a combination thereof.

10 . The negative electrode for a rechargeable lithium battery as claimed in claim 8 , wherein the aqueous binder comprises (meth)acrylic acid, (meth)acrylic acid salt, a (meth)acrylonitrile copolymer, or a combination thereof.

11 . The negative electrode for a rechargeable lithium battery as claimed in claim 10 , wherein the (meth)acrylic acid salt comprises an ammonium salt, an amine salt, or a combination thereof.

12 . The negative electrode for a rechargeable lithium battery as claimed in claim 10 , wherein an amount of the (meth)acrylonitrile is about 10 wt % to about 50 wt % based on about 100 wt % of the copolymer.

13 . A rechargeable lithium battery, comprising:
a negative electrode as claimed in claim 1 ; a positive electrode; and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Jungmin
• Cho Minho
• Cho Yunshik
• Jung Kyunghwa
• Kim Hana
• Lee Kukjoo
• Kim Ho

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/626

  Metals · CPC title

• H01M4/622 Primary

  being polymers · CPC title