Separator for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-2016141579-A1
Application number	US-201514855304-A
Country	US
Kind code	A1
Filing date	Sep 15, 2015
Priority date	Nov 19, 2014
Publication date	May 19, 2016
Grant date	—

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 at least one side of the substrate and comprising an organic material; and an inorganic layer on at least one side of the substrate and comprising an inorganic material, wherein the organic material comprises two or more organic particles having respective melting points that are different from each other.

2 . The separator for a rechargeable lithium battery of claim 1 , wherein one of the melting points of the organic material is lower than that of the substrate.

3 . The separator for a rechargeable lithium battery of claim 1 , wherein the melting point of the substrate is about 135° C. to about 140° C.

4 . The separator for a rechargeable lithium battery of claim 1 , wherein one of the melting points of the organic material is about 100° C. to about 130° C.

5 . The separator for a rechargeable lithium battery of claim 1 , wherein the two or more organic particles comprise a first organic particle and a second organic particle, the melting point of the second particle being different from that of the first organic particle, and
a melting point difference between the first organic particle and the second organic particle is about 10° C. to about 20° C.

6 . 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.

7 . 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.

8 . The separator for a rechargeable lithium battery of claim 1 , wherein the inorganic material comprises an inorganic particle comprising SiO 2 , Al 2 O 3 , Al(OH) 3 , AlO(OH), TiO 2 , BaTiO 2 , ZnO 2 , Mg(OH) 2 , MgO, Ti(OH) 4 , aluminum nitride (AlN), silicon carbide (SiC), boron nitride (BoN), or a mixture thereof.

9 . 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.

10 . 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.

11 . 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.

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

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

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/42

  Acrylic resins · CPC title