Spirally-wound electrode assembly for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9761854-B2
Application number	US-201414562503-A
Country	US
Kind code	B2
Filing date	Dec 5, 2014
Priority date	Dec 13, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A spirally-wound electrode assembly for a rechargeable lithium battery includes a positive electrode, a negative electrode and a separator between the positive electrode and the negative electrode, wherein the separator includes a porous film and an adhesive layer on at least one side of the porous film, and the adhesive layer includes a fluorine-based polymer-containing particulate and a binder. A rechargeable lithium battery includes the spirally-wound electrode assembly.

First claim

What is claimed is:

1. A spirally-wound electrode assembly for a rechargeable lithium battery, the spirally-wound electrode assembly comprising
a positive electrode;
a negative electrode; and
a separator between the positive electrode and the negative electrode,
wherein the separator comprises a porous film and an adhesive layer on at least one side of the porous film, and
the adhesive layer comprises a fluorine-based polymer-containing particulate and a binder, the fluorine-based polymer-containing particulate having an average particle diameter of 80 nm to 500 nm, and the fluorine-based polymer-containing particulate comprising the fluorine-based polymer and a resin different from the fluorine-based polymer.

2. The spirally-wound electrode assembly of claim 1 , wherein the binder is included in a smaller amount than that of the fluorine-based polymer-containing particulate.

3. The spirally-wound electrode assembly of claim 1 , wherein the volume ratio of the fluorine-based polymer-containing particulate to the binder is about 1.5:1 to about 20:1.

4. The spirally-wound electrode of claim 1 , wherein the fluorine-based polymer-containing particulate comprises spherically shaped particles.

5. The spirally-wound electrode assembly of claim 1 , wherein the resin different from the fluorine-based polymer comprises an acrylic resin.

6. The spirally-wound electrode assembly of claim 1 , wherein the fluorine-based polymer of the fluorine-based polymer-containing particulate comprises polyvinylidene fluoride.

7. The spirally-wound electrode assembly of claim 1 , wherein the binder comprises a polyolefin resin.

8. The spirally-wound electrode assembly of claim 1 , wherein the adhesive layer further comprises inorganic particles.

9. The spirally-wound electrode assembly of claim 1 , wherein the negative electrode comprises a negative active material layer comprising a negative active material and a binder,
the binder comprises fluorine-based polymer-containing particulate, and
the adhesive layer of the separator binds with the negative active material layer.

10. The spirally-wound electrode assembly of claim 9 , wherein the resin different from the fluorine-based polymer comprises an acrylic resin.

11. The spirally-wound electrode assembly of claim 9 , wherein the fluorine-based polymer of the fluorine-based polymer-containing particulate comprises polyvinylidene fluoride.

12. The spirally-wound electrode assembly of claim 9 , wherein the binder further comprises an elastomer-based polymer particulate.

13. A rechargeable lithium battery comprising the spirally-wound electrode assembly of claim 1 .

14. A spirally-wound electrode assembly for a rechargeable lithium battery, the spirally-wound electrode assembly comprising
a positive electrode;
a negative electrode; and
a separator between the positive electrode and the negative electrode,
wherein the separator comprises a porous film and an adhesive layer on at least one side of the porous film,
wherein the adhesive layer comprises a fluorine-based polymer-containing particulate and a binder,
wherein the fluorine-based polymer-containing particulate has an average particle diameter of 80 nm to 500 nm, and
wherein the fluorine-based polymer-containing particulate comprises an interpenetrating polymer network formed from a fluorine-based polymer and a resin different from the fluorine-based polymer.

15. The spirally-wound electrode assembly of claim 14 , wherein the resin different from the fluorine-based polymer comprises an acrylic resin.

16. The spirally-wound electrode assembly of claim 14 , wherein the negative electrode comprises a negative active material layer comprising a negative active material and a binder, the binder comprises fluorine-based polymer-containing particulate, and the adhesive layer of the separator binds with the negative active material layer.

17. The spirally-wound electrode assembly of claim 16 , wherein the resin different from the fluorine-based polymer comprises an acrylic resin.

18. The spirally-wound electrode assembly of claim 1 , wherein the fluorine-based polymer-containing particulate has an average particle diameter of 300 nm to 500 nm.

Assignees

• Samsung Sdi Co Ltd
• Samsug Sdi Co Ltd

Inventors

• Hoshiba Koji
• Takano Yasuo

Classifications

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M2/166

  Electricity · mapped topic

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M2/1653

  Electricity · mapped topic

• H01M2/1686

  Electricity · mapped topic