Electrode winding element for non-aqueous electrolyte rechareable battery, non-aqueous electrolyte rechargeable lithium battery including same, method of preparing same

Patent metadata

Field	Value
Publication number	US-10256471-B2
Application number	US-201514973572-A
Country	US
Kind code	B2
Filing date	Dec 17, 2015
Priority date	Dec 22, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

An electrode wound element for a non-aqueous electrolyte rechargeable battery includes a belt-shaped positive electrode; a belt-shaped negative electrode; a belt-shaped porous layer between the belt-shaped positive electrode and the belt-shaped negative electrode; and an adhesive layer formed on the surface of the belt-shaped porous layer, wherein the adhesive layer includes a fluorine resin-containing particulate and a binder for an adhesive layer supporting the fluorine resin-containing particulate, the binder comprising at least one of an ionic non-water-soluble binder, a non-ionic water-soluble binder, a non-ionic non-water-soluble binder and an ionic water-soluble binder.

First claim

What is claimed is:

1. An electrode wound element for a non-aqueous electrolyte rechargeable battery, comprising
a belt-shaped positive electrode;
a belt-shaped negative electrode;
a belt-shaped porous layer between the belt-shaped positive electrode and the belt-shaped negative electrode; and
an adhesive layer formed on a surface of the belt-shaped porous layer,
wherein the adhesive layer comprises a fluorine resin-containing particulate and a binder for the adhesive layer supporting the fluorine resin-containing particulate and having a total volume which is less than that of the fluorine resin-containing particulate, the binder for the adhesive layer comprising a combination of at least one water-soluble binder and at least one non-water-soluble binder,
wherein the non-water-soluble binder comprises at least one member selected from the group consisting of a carboxylic acid-modified acrylic acid ester and a carboxylic acid-modified styrene-butadiene copolymer; and
when the binder for the adhesive layer comprises an ionic water-soluble binder, a content of the ionic water-soluble binder is about 2 wt % or less based on a weight of the fluorine resin-containing particulate.

2. The electrode wound element of claim 1 , wherein the binder for the adhesive layer comprises at least one member selected from the group consisting of an ionic non-water-soluble binder and a non-ionic water-soluble binder.

3. The electrode wound element of claim 2 , wherein the non-ionic water-soluble binder comprises at least one member selected from the group consisting of poly-N-vinyl acetamide, polyvinyl alcohol, hydroxyethyl cellulose, methyl cellulose, polyvinylpyrrolidone, and polyoxyethylene.

4. The electrode wound element of claim 1 , wherein the belt-shaped negative electrode comprises a negative active material layer comprising a negative active material and a fluorine resin-containing particulate, and wherein the adhesive layer is attached to the negative active material layer.

5. The electrode wound element of claim 1 , wherein the fluorine resin-containing particulate is a spherical-shaped particle.

6. The electrode wound element of claim 1 , wherein the fluorine resin comprises polyvinylidene fluoride.

7. A non-aqueous electrolyte rechargeable battery comprising the electrode wound element of claim 1 .

8. A method of preparing an electrode wound element for a non-aqueous electrolyte rechargeable battery comprising:
coating an aqueous slurry on a surface of a belt-shaped porous layer, the aqueous slurry comprising a fluorine resin-containing particulate and a binder for an adhesive layer supporting the fluorine resin-containing particulate and having a total volume which is less than that of the fluorine resin-containing particulate, wherein the binder for the adhesive layer comprises at least one member selected from the group consisting of an ionic non-water-soluble binder, a non-ionic water-soluble binder, a non-ionic non-water-soluble binder and an ionic water-soluble binder or the binder for an adhesive layer includes an ionic water-soluble binder and at least one member selected from the group consisting of an ionic non-water-soluble binder, a non-ionic water-soluble binder and a non-ionic non-water-soluble binder, wherein a content of the ionic water-soluble binder is about 2 wt % or less based on the weight of the fluorine resin-containing particulate; and drying the belt-shaped porous layer coated with the aqueous slurry, whereby the electrode wound element of claim 1 is obtained.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Hoshiba Koji

Classifications

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/0525 Primary

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title