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

Patent metadata

Field	Value
Publication number	US-2025149738-A1
Application number	US-202418823987-A
Country	US
Kind code	A1
Filing date	Sep 4, 2024
Priority date	Nov 7, 2023
Publication date	May 8, 2025
Grant date	—

Abstract

A negative electrode for a rechargeable lithium battery includes a current collector, a negative electrode active material layer on the current collector, and an organic-inorganic composite layer on the negative electrode active material layer and integrated with the negative electrode active material layer. The negative electrode active material layer includes a negative electrode active material and a first binder, the organic-inorganic composite layer includes a second binder, and the first binder and the second binder include a copolymer including a structural unit derived from a (meth)acrylonitrile monomer.

First claim

What is claimed is:

1 . A negative electrode for a rechargeable lithium battery, the negative electrode comprising
a current collector, a negative electrode active material layer on the current collector, and an organic-inorganic composite layer on the negative electrode active material layer and integrated with the negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a first binder, the organic-inorganic composite layer includes a second binder, and at least one of the first binder and the second binder include a copolymer including a structural unit derived from a (meth)acrylonitrile monomer.

2 . The negative electrode as claimed in claim 1 , wherein
the structural unit derived from the (meth)acrylonitrile monomer is represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
R 1 is hydrogen or a C1 to C3 alkyl group,
L 1 is —C(═O)—, —C(═O)O—, —OC(═O)—, —O—, or —C(═O)NH—,
L 2 is a substituted or unsubstituted C1 to C10 alkylene group, a substituted or unsubstituted C3 to C20 cycloalkylene group, a substituted or unsubstituted C6 to C20 arylene group, or a substituted or unsubstituted C3 to C20 heterocyclic group,
x is an integer in a range of 0 to 2, and
y is an integer in a range of 0 to 2.

3 . The negative electrode as claimed in claim 1 , wherein the structural unit derived from (meth)acrylonitrile monomer comprises a unit derived from at least one of (meth)acrylonitrile, alkenenitrile, cyanoalkyl(meth)acrylate, and 2-(vinyloxy)alkanenitrile.

4 . The negative electrode as claimed in claim 3 , wherein the alkenenitrile comprises at least one of allyl cyanide, 4-pentenenitrile, 3-pentenenitrile, 2-pentenenitrile, 5-hexenenitrile, and a combination thereof.

5 . The negative electrode as claimed in claim 3 , wherein the cyanoalkyl (meth)acrylate comprises at least one of cyanomethyl(meth)acrylate, cyanoethyl(meth)acrylate, cyanopropyl(meth)acrylate, cyanooctyl(meth)acrylate, and a combination thereof.

6 . The negative electrode as claimed in claim 3 , wherein the 2-(vinyloxy)alkanenitrile comprises at least one of 2-(vinyloxy) ethanenitrile and 2-(vinyloxy) propanenitrile.

7 . The negative electrode as claimed in claim 1 , wherein the first binder comprises the copolymer including the structural unit derived from the (meth)acrylonitrile monomer and a structural unit derived from a (meth)acrylic acid-based monomer.

8 . The negative electrode as claimed in claim 7 , wherein the structural unit derived from the (meth)acrylonitrile monomer is included in an amount of about 35 wt % to about 65 wt % based on 100 wt % of the copolymer.

9 . The negative electrode as claimed in claim 7 , wherein the structural unit derived from a (meth)acrylic acid-based monomer is included in an amount of about 35 wt % to about 65 wt % based on 100 wt % of the copolymer.

10 . The negative electrode as claimed in claim 7 , wherein the copolymer further comprises a structural unit derived from a hydroxyl group-containing monomer or an amide group-containing monomer.

11 . The negative electrode as claimed in claim 1 , wherein the first binder further comprises a binder including at least one of a styrene-butadiene rubber, a (meth)acrylated styrene-butadiene rubber, a (meth)acrylonitrile-butadiene rubber, a (meth)acrylic rubber, a butyl rubber, polyethylene oxide, polyvinylpyrrolidone, polyepichlorohydrin, polyphosphazene, an ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, a polyester resin, a (meth)acrylic resin, a phenol resin, an epoxy resin, polyvinyl alcohol, and a combination thereof.

12 . The negative electrode as claimed in claim 1 , wherein the structural unit derived from the (meth)acrylonitrile monomer is included in an amount of about 35 wt % to about 65 wt % based on 100 wt % of the copolymer included in the second binder.

13 . The negative electrode as claimed in claim 1 , wherein the negative electrode active material comprises at least one of a carbon-based negative electrode active material and a Si-based negative electrode active material.

14 . The negative electrode as claimed in claim 13 , wherein the Si-based negative electrode active material is included in an amount of about 0.1 wt % to about 10 wt % based on total weight, 100 wt % of negative electrode active material.

15 . The negative electrode as claimed in claim 13 , wherein the Si-based negative electrode active material comprises a silicon-carbon composite.

16 . The negative electrode as claimed in claim 15 , wherein the silicon-carbon composite comprises a core including silicon particles, and a carbon coating layer on the surface of the core.

17 . The negative electrode as claimed in claim 1 , wherein the organic-inorganic composite layer comprises an organic layer and an inorganic layer.

18 . The negative electrode as claimed in claim 17 , wherein the organic layer comprises a polymer including at least one of polyethylene (PE), polypropylene (PP), polyester, polyamide, polyimide (PI), polyamideimide (PAI), polyetherimide, polyacrylonitrile (PAN), polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polycarbonate (PC), polyvinyl chloride (PVC), polyvinylidene chloride, polyethylene glycol derivatives, polyoxide, polyvinyl acetate, polystyrene (PS), polyvinylpyrrolidone (PVP), a copolymer thereof, and a combination thereof.

19 . The negative electrode as claimed in claim 17 , wherein:
the inorganic layer comprises inorganic particles and the second binder, the inorganic particles include at least one of alumina (Al 2 O 3 ), boehmite (aluminum oxide hydroxide), zirconia, titania (TiO 2 ), silica (SiO 2 ), and a combination thereof.

20 . The negative electrode as claimed in claim 17 , wherein:
the organic layer is in a woven form, and the inorganic layer is a dense layer.

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

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Jungmin
• Jung Kyunghwa
• Lee Kukjoo
• Song Hyo-Jung
• Cho Minho
• Cho Yunshik
• Kim Hana

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/366

  as layered products · CPC title