Separator for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-10529972-B2
Application number	US-201514855304-A
Country	US
Kind code	B2
Filing date	Sep 15, 2015
Priority date	Nov 19, 2014
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A separator for a rechargeable lithium battery includes a substrate; an organic layer on at least one side of the substrate and including an organic material; and an inorganic layer on at least one side of the substrate and including an inorganic material, where the organic material includes two or more organic particles having respective melting points that are different from each other. A rechargeable lithium battery includes the separator.

First claim

What is claimed is:

1. A separator for a rechargeable lithium battery, comprising:
a substrate;
an organic layer on one side of the substrate and comprising an organic material; and
an inorganic layer on another side of the substrate and comprising an inorganic material,
wherein the inorganic material comprises an inorganic particle comprising Al(OH) 3 , AIO(OH), Mg(OH) 2 , Ti(OH) 4 , aluminum nitride (AlN), silicon carbide (SiC), boron nitride (BN), or a mixture thereof,
wherein the organic material comprises two or more organic particles having respective melting points that are different from each other,
wherein the two or more organic particles comprise a first organic particle and a second organic particle, the melting point of the second organic particle being different from that of the first organic particle,
wherein a melting point difference between the first organic particle and the second organic particle is 10° C. to 20° C.,
wherein one of the melting points of the organic material is lower than that of the substrate and another of the melting points is 110° C. to 120° C.,
wherein the melting point of the substrate is about 135° C. to about 140° C.,
wherein one of the melting points of the organic material is 128° C. to about 130° C., and
wherein the organic layer does not include an inorganic material.

2. The separator for a rechargeable lithium battery of claim 1 , wherein the organic material comprises a polyolefin, a polyolefin derivative, a polyolefin wax, an acryl-based compound, or a mixture thereof.

3. The separator for a rechargeable lithium battery of claim 1 , wherein the organic material has a particle size of about 0.1 μm to about 5 μm.

4. The separator for a rechargeable lithium battery of claim 1 , wherein the inorganic material has a particle size of about 0.1 μm to about 5 μm.

5. The separator for a rechargeable lithium battery of claim 1 , wherein the inorganic layer has a thickness of about 1 μm to about 10 μm, and
the organic layer has a thickness of about 1 μm to about 10 μm.

6. The separator for a rechargeable lithium battery of claim 1 , wherein at least one selected from the organic layer and the inorganic layer further comprises a binder, and
the binder comprises a styrene-butadiene rubber (SBR), carboxylmethyl cellulose (CMC), polyvinylidene fluoride (PVdF), a polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) copolymer, ethylene vinylacetate (EVA), hydroxyethyl cellulose (HEC), polyvinyl alcohol (PVA), polyvinylbutyral (PVB), an ethylene-acrylic acid copolymer, acrylonitrile, a vinyl acetate derivative, polyethylene glycol, an acryl-based rubber, or a mixture thereof.

7. A rechargeable lithium battery comprising the separator of claim 1 .

8. A separator for a rechargeable lithium battery, comprising:
a substrate;
an organic layer on one side of the substrate and comprising an organic material; and
an inorganic layer on another side of the substrate and comprising an inorganic material,
wherein the inorganic material comprises an inorganic particle comprising Al(OH) 3 , AIO(OH), Mg(OH) 2 , Ti(OH) 4 , aluminum nitride (AlN), silicon carbide (SiC), boron nitride (BN), or a mixture thereof,
wherein the organic material comprises a first organic particle and a second organic particle,
wherein a melting point of the first organic particle is about 110° C. to about 120° C. and a melting point of the second organic particle is lower than that of the substrate,
wherein a melting point difference between the first organic particle and the second organic particle is about 10° C. to 20° C., and
wherein the organic layer does not include the inorganic material.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Seok Hoon
• Park Jong-Hwan
• Nam Jung-Hyun
• Lee Eon-Mi
• Choi Yeon-Joo
• Goh Ae-Hui

Classifications

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/0525

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

• H01M2/1686 Primary

  Electricity · mapped topic

• H01M2/1633

  Electricity · mapped topic

• H01M2/1653

  Electricity · mapped topic